I know this question was asked before, but almost 2 years have passed and the business requirements are a little different.
We are in the beginning of developing a mid-sized application and are divided which technology to use for the front end, WPF or ASP.Net MVC 3?
We are not an IT-company, but a business company with an IT-department who can outsource programming tasks, while the business core shall remain within the company. I did spend a lot time searching the internet for the answer, and I partially did succeed, but since the question is so important, I thought I ask here as well.
Of course, before someone can answer the question I need to specify the requirements and environment for the application at stake:
Infrastructure:
We have a pure Windows environment. Each user will have either Windows XP SP3 (currently) or a future version of Windows (if we skip from XP to Windows 8 remains to be seen, but let us assume that the user will use Windows 7 next) installed.
We are aiming for a service oriented architecture, meaning we only want to run/show on the client machine what is really needed. This is especially important since the databases are far away from the clients (USA/Europe). We plan on using WCF for cross machine communication between user system (brower or WPF), application and database server.
We expect the main user group to be around 30+, but since we are a growing company there should be no issue scaling up to 100 users. The users are spread over three main locations over the world, while we want the option to support smaller locations as well. All those locations are connected to the same intranet.
UI Experience
The new system is supposed to replace existing systems which are desktop applications (Winform). The number of screens are likely to be around 100+ with many labels, comboboxes, graphs. I like to call it an expert system b/c we expect the user to spend multiple hours a day with it, the user is expected to do interact fast with it (many clicks, multiple dialogs pop-up and close etc.) and the application will contain a lot of business logic (mostly mathematically).
Some limited interaction with Excel is required. At this stage only importing formatted data out of .xlsx file into the application in order to work with the data. This we expect to happen often.
Copy&Paste from Excel or other applications into our new application is a requirement (no pictures, just text).
We will use a vendor control library for a richer UI experience.
The users are used to desktop applications for their daily work (current systems/Excel etc.).
Tablet or smartphone support is not a requirement.
Deployment
If we were to use a WPF application we would likely either deploy it in CITRIX or use Click-Once.
Here are arguments of the two opposing factions:
Pro Web:
Deployment is much easier. All the requirements can be done in a web application directly, and if not we use ActiveX or make a separate desktop application for the missing parts. Also, the IT world is going to stop doing pure desktop applications and everything is moving to HTML 5 (Windows 8).
Pro WPF:
Web applications use many different technologies which makes it more difficult and costly to develop and maintain (HTML, ASP.NET, CSS, JavaScript, JQuery, AJAX). There are major deficiencies in a web-applications, mainly
Considering the various browsers and versions.
Screen resolutions
No hardware support for graphics (business graphs, point graphs with 200+ points)
Restricted access to local hardware (importing files, creating files, printing)
Keyboard shortcuts
Point #1 is also worrying since the browser is more out of control since other web-applications in the company (not expert systems) are used, and we fear conflicting interests with the new application (e.g., we must use a browser version where ALL applications run/render fine).
I know there is no black and white on this, but I would be interesting in the following:
Who was in a similar situation and how did they solve it?
(there is a nice article at http://karlshifflett.wordpress.com/2007/12/20/reasons-for-choosing-wpf-over-aspnet-for-very-large-project/, but the problem is that the article is 5 years old :(
How much more expensive is a web solution?
For development assume that the programmers are equally skilled in both (we can outsource this). For maintainance assume that we will internally support this where we have limited knowledge in ASP.NET and WPF. We know WinForm/WCF using C#. We would have to train/learn either technology.
How easy can a web application do Excel interaction, printing etc.?
I read a lot about "ActiveX hell" and I am wondering where we stand today?
Deployment
I have used Click-Once quite successfully in the past, although some team members mention that Click-once can be an issue. Any experiences?
Future?
The system is supposed to last 5+ years. We can not target HTML5 at this time (WinXP only up to IE 8). Where does Windows 8 stand on this?
Other thoughts?
What important things am I missing?
Thank you!
I know this entry is long and not an easy question. So I think you for reading and thank you even more for constructive feedback. Thank you!!!!
I would not build a business application in WPF, especially if your goal is to have it last for 5+ years. Silverlight is in sunset phase now - Win8 apps are betting on JavaScript and HTML5 now, though you are correctly noting that HTML5 support is not universal across all browsers and platforms (see http://caniuse.com/)
Let me try and address some of your concerns above to hopefully persuade you to build a web app:
Considering the various browsers and versions. Yes, you would have to do that. However, for enterprise applications most of the time you can find an acceptable solution if you use industry-standard web technologies and don't use esoteric HTML5 stuff that is not universally supported. It won't be a slam dunk, but it is very much doable.
Screen resolutions. You can address this by utilizing what is commonly known as Responsive Web Design. Once again, there is broad community and industry support for CSS frameworks that allow you to achieve responsiveness. YUI and Bootstrap come to mind as two examples.
No hardware support for graphics (business graphs, point graphs with 200+ points). Well, here is where HTML5 Hardware Acceleration may help you, but I'd say that libraries like HighCharts can easily handle 200+ points graphs - see this example
Restricted access to local hardware (importing files, creating files, printing). Fair point. I'd argue that working with files is MUCH easier with things like Socket.io, Filepicker.io and Zip.js, but "enterprise" requirements may get in the way. And as for printing, you can create "printable" version of your pages or generate PDFs and Excel Exports on the server side. Not ideal, but very much workable.
Keyboard shortcuts. Have you used Gmail app? It is full of shortcuts and keyboard-based interactions. This applies to any application - if you need keyboard interactions, you'd have to build them regardless of your choice of WPF or Web
The web based application I am working on currently is a port from a windows application. This application is very data intensive. There are scores of modules and each of these modules have number of forms (data entry screens) and reports whereas the forms have many many fields and likewise the reports.
I have been trying to identify the most suitable architecture for the presentation tier. There are many functions that are not very easily portable, for example printing (this too is very complex). For most of the others, I am planning to us "Ext JS" library which looks like capable of handling about 70% of complexity out of the box while for the remaining I would be custom coding or extending Ext JS.
Having said that (sorry for being so descriptive), I wonder, if this is an Intranet application, why not port the entire application to SilverLight? While I am good at .Net, I'm somewhat alien to SilverLight. Considering I know my target audience and that the software will be used per seat license, would it be better to ride on SilverLight or is it better to stick to conventional web (XHTML, JS, CSS, etc)? Further, I have to support multiple devices in future and considering that SilverLight plug-ins for many devices are yet not out, would it be a risk?
IMO, if you are developing a web application, then yes, develop it as an RIA.
The choice of technology is up to you. I prefer jQuery and have never used ExtJS. But I've taken a look at it, and if your aplication is a port of a windows application and has a lot of conventional UI elements like forms, input boxes, toolbars, menus, button etc, then go for ExtJS.
As for some controls that are not available in ExtJS, you can easily extend ExtJS.
Regarding .NET: ExtJS is completely server-technology agnostic, so you can develop your application in .NET and still use an ExtJS UI. In fact, I would prefer to do such an implementation.
Regarding Silverlight: I am slightly against using silverlight, primarily because it requires a plugin to be installed that is not available on all platforms. But since your application is an intranet application, your user base will be in your control. But you should make sure that any future decision regarding the workstation platform will not affect your application's working.
Cheers
Whether to use Silverlight over HTML/JS etc. in this case would depend on 2 key factors.
What are you familar with already
What type and range of devices you need to reach.
If you are already comfortable with HTML + ExtJS then that has to be huge pro in its favor.
The range of devices that Silverlight is possibly going to be available (Windows Phone 7 for example as well as Moonlight, I've even heard that there may be port for Andriod and Symbian) is growing. However its really early days for that and not all may materialise in a form useful to you.
Having said that it should be acknowledged that a UI designed for use on desktop does not work well on a small device. Hence you would need to develop some task specific UI for other devices regardless of the technology you use. This in turn means that there is no reason for you to try to stick with single technology for all devices.
I think you should look very carefully into WCF, REST and OData first. Good layering of the application into useful models using these would more easily enable the use of a variety of front-end technologies for the client.
If you are into .NET and other Microsoft tech then you should seriously consider using JQuery and ASP.NET MVC as another potential front end technology.
I think that you need to ponder the inconveniences of a solution based solely in Silverlight. Like Flash it needs a plugin to be installed in every station, so it loses some of the premises of web applications (run everywhere with the only requirement of a browser). Besides although Silverlight has taken great advances, it is not yet a widely supported standard, and it is in control of a company who later may decide for you in very important matters regarding the platform you use, and made it outdated or useless (in the worst case).
Ext JS is a great library developed entirely in Javascript, so you can touch anything that suits your needs. If the Windows applications you are basing on is well-layered, then your work may not be that hard.
If you are an asp.net developer you could take a look on asp.net mvc, a great set of tools that implements MVC pattern to web applications using the same old C# or VB. Besides the developers behind asp.net mvc, have taken a lot of work to make it suitable to work with javascript libraries like jQuery
Happy coding!!!
I'm looking for some arguments to pitch to my boss and fellow developers.
We're currently finishing up the preliminary UI mockups and getting ready to move on to the next phases of development. In the meantime, I've been digging through the depths of the Carbon, Win32, and wxWidgets APIs attempting to make some of the controls have a more native look and feel on the Mac and Windows platforms.
The more I dig into the Win32 and Carbon APIs to implement the things we want in our project's UI, the more antiquated they feel, and the more I'm beginning to think that we should be implementing the project as described in the last paragraph here.
We're using wxWidgets for our current projects. wxWidgets is coming along on the wxCocoa port, but it doesn't look like it's going to be ready for prime-time before we start major development efforts on our new application. On the Windows side of things, it wraps the Win32 API rather than WinForms or WPF (likely due to native vs. managed code).
We're already designing the system with the MVC pattern in mind, thus aside from having to write two native UIs, it should be very doable, and, IMHO, easier to get the desired UI effects using modern APIs such as Cocoa and WPF.
I've been trying to push these points subtly, but the start of major development is coming soon. Does anyone have any suggestions on how to pitch using native UI toolkits in our next application vs sticking with wxWidgets?
Thanks in advance.
Create your core code in Standard C++ and use Objective-C++ with Cocoa to create your user experience on the Mac and C++/CLI plus C# with WPF to create your user experience on Windows. Follow the platform guidelines for the Mac in your Mac version, for Windows in your Windows version, and don't even bother thinking about trying to share user interface code.
One good way to manage this is, instead of just Model-View-Controller, following a Model-Model Controller-View Controller-View architecture. Your Model Controllers are platform-independent and manage the higher-level functionality of your application. (For example, its entire concept of documents, file format, job queues, and so on.) Your View Controllers are platform-dependent and mediate between your Model Controllers and your user experience.
Of course you'll probably also want some platform-dependent code at the model level too; for example to use NSOperation on the Mac and thread pools on Windows to implement job queues. Just create your own lightweight abstractions for that sort of thing.
Actually I think using Qt has become very interesting since it's now LGPL
Every time you add a layer of abstraction, you trade control over the details for more rapid development. You'll be able to get a lot done up-front using some cross-platform framework. On the flip side, when you want to do something that the framework doesn't support—and lets face it: it isn't going to implement all possible things those native APIs can do—you either have to implement it (for all platforms) using the native API, or do some other wierd hackery to get a "good enough" solution. And of course, when things go terribly wrong, having that extra layer of code you don't own makes it harder to debug. There really is something to be said for owning your entire stack as much as possible.
Writing two font ends is a lot of work, maintaining two front ends is a huge amount of work, if you need your program to run on multiple platforms go with a multi-platform toolkit.
If you write platform specific front-ends, each using the state of the art tools for that particular platform, you will get a much better user experience - but the cost of developing and maintaining those will be on the same order of magnitude as developing the entire application from scratch for each platform (yes, even with MVC).
Personally, I'd rather stick multiplatform and don't give a damn for that eyecandy, but if I wanted to pitch the use of those native APIs, I'd work out the (end-user-visible) differences between how things are done in different GUIs. If you can convince them that, in order to feel native, the program's user interface has to look and feel very differently on Windows and OSX (because of different design guides/philosophies/whatever), they should understand that, even with wx, you would still have to implement it twice, to accommodate those different requirements, so you might just as well use the real thing, i.e. the native API.
Also see this thread on the Google Chrome mailing list discussing the same choice of UI for Chrome on different platforms.
Win32 is definitely waay to old, but you might want to look into something like Microsoft Foundation Classes which is designed to do native development with C++. I assume that a similar thing exist for MAC.
Personally if I was in your situation I would properly also go for QT or WX.
Does anyone have any suggestions on how to pitch using native UI toolkits in our next application vs sticking with wxWidgets?
No one likes a corridor-wiseass.
I think action speak louder than words...make a small prototype of how you think it could be done, and show it. Maybe you have to do this in your spare time.
Cocoa is really great so I think that with little code you can show an idea...well, this require that you know Cocoa enough.
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Most restrictions and tricks with windows forms are common to most programmers. But since .NET 3.0 there is also WPF available, the Windows Presentation Foundation. It is said that you can make "sexy applications" more easy with it and with .NET 3.5 SP1 it got a good speed boost on execution.
But on the other side a lot of things are working different with WPF. I will not say it is more difficult but you have to learn "everything" from scratch.
My question: Is it worth to spend this extra time when you have to create a new GUI and there is no time pressure for the project?
After three months of trying to hammer out a line-of-business (LOB) application on WPF, I reached a point of considering turning back to Windows Forms for my project, and in researching other people's opinions, came across this thread...
Yes, WPF is a brilliant technology and it has benefits that span far beyond mere eye-candy... the templating and binding capabilities are great examples. The whole object model offers more flexibility and broader possibilities. That doesn't, however, make it the defacto platform for future LOB applications.
The "problems" which WPF solves in terms of separating GUI from business logic aren't problems which can't be readily solved in Windows Forms by simply starting with the right architecture and mind-set. Even the object-path binding capabilities of WPF can be reproduced in Windows Forms with some very simple helper classes. The data template capabilities of WPF are very nice, but again they're nothing that you can't simulate in Windows Forms on those rare occasions when you absolutely don't know exactly what objects you're going to represent on any given part of the screen.
Where Windows Forms races ahead is in terms of maturity. You can't swing a dead cat on Google without hitting some blog where someone has solved a Windows Forms problem for you. WPF, on the other hand, has comparatively less learning resources available, fewer custom controls available, and hasn't had as many of its teething problems solved.
At the peak of making a WPF vs Windows Forms decision has got to be the maturity of the development environment. Windows Forms editors are slick, responsive and intuitive. Feedback about errors gets to you instantly, the solutions are usually obvious, and the compile->debug->edit cycle in Windows Forms is very quick.
WPF applications, on the other hand, have comparatively pathetic design time support, with the design view all-too ready to chicken out at the first encounter of an error, often requiring a project build after the fix before the designer is willing to kick in again. Drag'n'drop of components from the toolbox might as well not be supported, given the vast range of circumstances under which it either doesn't work at all, or yields completely unintuitive results. Despite the promise of the WpfToolkit, there still isn't a usable DataGrid for WPF that yields any kind of resonable performance or design time friendliness.
Debugging WPF applications is a bit like the old ASP.NET debugging paradigm... hit F5 -> wait -> launch -> error -> stop -> fix -> hit F5 -> wait -> launch -> error -> groan -> stop -> fix -> hit F5.... All XAML which your program is running is locked, and tracking down XAML specific problems is often tedious.
The bottom line, simply put, is that the development tools for Windows Forms are going to have you banging out front-ends in a fraction of the time of a WPF application... especially if you're creating master-detail grids or spreadsheet like interfaces, which most LOB have. With Windows Forms, you start with 90% of the work already done for you.
I'm a huge fan of the WPF architecture. I just wish the design-time tool-set didn't feel like a pre-alpha debug-build.
Edit: This answer was posted about .NET 3.5 + Visual Studio 2008, but .NET 4.0 with Visual Studio 2010 ships with a WPF data grid. While many improvements have been made to the new WPF development experience, my answer here remains unchanged, and I'd like to add the following suggestion:
If you're in a rush to do RAD development, go with Windows Forms. If you're looking to produce a well architected, maintainable, scalable, resource firendly, multi-user Line-Of-Business application, consider ASP.NET MVC + HTML 5 + jQuery... My projects with these technologies have resulted in better outcomes, sooner, for my customers. MVC offers all of the same templating that WPF does, and jQuery enables animations and complex interactions. More importantly, an ASP.NET MVC + jQuery solution doesn't require your end users to have modern desktops with decent graphics hardware.
I'm seven months into using WPF on what has now become a core system for my customer, and I'd like to share some more thoughts with you about the experience of learning and using WPF as a line of business presentation platform.
In general, the comments I made above still hold... The design time support for WPF isn't here yet. If you're in a big rush to get a rich-client application out of the door, go with Windows Forms. Period. Microsoft aren't in any hurry to discontinue the GDI / Windows Forms platform, so you can count on good support for a fair time into the future.
WPF is not easy to master, but that shouldn't be where you leave your descision about whether or not to invest your time and energy into learning WPF. Despite its present lack of maturity, WPF is built around some useful, modern concepts.
In WPF, for example, your investment in well-written business objects with sound validating logic is a solid investment. Unlike Windows Forms, WPF's data binding is briming with features that allow interface controls to react to invalid user input without writing GUI code to detect those errors. This is valuable.
The styling and templating capabilities in WPF have proven to be valuable too. Despite the common misconception that the only use for styling and templating is to create on-screen eye-candy, the truth is that these features significantly simplify the coding of a user interface which gives rich feedback - like buttons that disable/enable themselves base on the state of the underlying business logic layer, or tooltips which intelligently find their text based on the state of the object under the cursor, etc.
These all add up to incredibly valuable features for "nothing fancy" business applications, simply because they make it easy to keep the interface congruent with the underlying data.
In a nutshell:
In Windows Forms you design your user
interface, then write code to drive
that user interface, which generally
also includes code to drive your
data objects.
In WPF you invest in the business layer that drives your data objects, then design an interface that listens to your data objects.
It's a seemingly subtle difference, but it makes a huge difference in your ability to re-use code... which begs the question: "Is the Windows Forms vs WPF question actually an investment decision?"
(This seems to have become my favourite thread.)
Are there any compelling reasons to use WPF
Absolutely! WPF is absolutely incredible! It will be a major benefit for practically any project because it has so many features and abilities that Windows Forms lacks.
For business applications the biggest wins will be:
The fantastic data binding and templating make the biggest difference. Once a decent data model is in place, it only takes a few clicks to create a data template and use Expression Blend to configure exactly how your object will look using drag-and-drop. And binding to things like color or shape is trivial.
Screen layout is incredibly flexible. Not only can everything in WPF smoothly adjust to container size and shape changes, but items can trivially be enlarged and rotated, and even extend outside their containing frame.
Ordinary objects can be presented any way you like, can easily have different presentations in different screens, can share presentation, and can adapt their presentation to changes in data values.
If you need to print, rendering to the printer is trivial. Properly configured, WPF makes Crystal Reports or SQL Server Reporting Services (SSRS) look like a child's toy.
Your user interface will look and feel much more dynamic, including nice features such as buttons that animate when you pass the mouse over them.
For utilities and games, other advantages come to the forefront:
You can easily add shapes, lines, and arbitrary drawings to your application without using an external editor. Every component of these can be data-bound and animated, or controlled by code. In Windows Forms you ususally just have to import a bitmap and use it as-is unless you want to go to a lot of work.,
Animations are cool! Users will be really impressed, as long as you don't overdo it. They can also help people see what is going on and reduce the need for hilighting. For example, when dragging an object you can animate the target to show what will happen if you drop it.
Colors, gradient fills, brushes, fancy fonts, rotation of any objects, tile brushes, etc. Anything you want graphically is yours for the asking.
Incredibly customizable. I needed to draw railroad tracks for one application, so I could drop a train on them. A couple of hours later I had railroad tracks I could draw anywhere on the screen using Bézier curves, and they would join and switch automatically.
The bottom line is that any significant-size GUI you could build in Windows Forms can be built in WPF in a third of the effort (or less) and look way, way better.
Does WPF require more resources (RAM in particular)
You do pay a price compared to Windows Forms, but it is a small one.
RAM can go up or down depending on your implementation. WPF stores its data more efficiently so individual objects are smaller, but there tend to be more objects in WPF than in Windows Forms so this balances out, and either one can come out ahead.
CPU will go up compared to Windows Forms. In my experience, the actual update of WPF objects onscreen takes about twice as much CPU as normal Windows Forms rendering. If your application spends most of its time updating the screen, WPF may not be for you. But in that case you're probably not using Windows Forms either: Most serious games are written directly to DirectX.
Disk usage will be slightly less for WPF because it takes so much less code than Windows Forms. The data will be the same size, of course.
One more note about CPU use: Animations and transforms (motion, translation, etc.) is actually more efficient on WPF than in Windows Forms because of its retained mode storage. It is the initial getting of the objects up there that is slower.
Maintenance overhead
WPF is a huge win over Windows Forms when it comes to maintenance. Since everything is done in 1/5 as much code as before, there is 1/5 as much to maintain. Plus all the boilerplate stuff is gone so you can focus on the code that actually does the work.
Benefits of XAML
XAML is the core of WPF. Although WPF can be used without XAML, XAML makes it incredibly easy to use. XAML has HTML's ability to easily specify a user interface, but its built-in tags are much more powerful, and you can easily define your own. (In fact, it is normal to do so).
Some specific advantages of XAML:
Your entire UI is defined in a text file that is easy to read and manipulate, both for users and tools
MarkupExtensions allow Bindings to be specified in a clear and simple way
Type converters allow properties with complex types to be easily specified. For example, you can say Brush="Green" or you can specify a radial gradient brush with three stops.
You can create your own elements
You can easily leverage WPF's powerful "attached properties"
Other insights
I dreamed of something like WPF for many years. Many people have implemented portions of this functionality, but to get it all in one place and at such a price ($0) is amazing.
WPF is a huge paradigm shift from Windows Forms and will take some getting used to, but the time spend learning it will pay itself back many-fold.
WPF still has a few warts even five years later, but its power will totally blow you away once you experience it. If someone tries to drag you back to Windows Forms, you'll only go kicking and screaming.
Tips:
- Do get a copy of Expression Blend for development
- Do edit XAML by hand occasionally
- Don't give up when it seems strange at first
WPF enables you to do some amazing things, and I LOVE it... but I always feel obligated to qualify my recommendations, whenever developers ask me whether I think they should be moving to the new technology.
Are your developers willing (preferrably, EAGER) to spend the time it takes to learn to use WPF effectively? I never would have thought to say this about MFC, or Windows Forms, or even unmanaged DirectX, but you probably do NOT want a team trying to "pick up" WPF over the course of a normal dev. cycle for a shipping product!
Do at least one or two of your developers have some design sensibilities, and do individuals with final design authority have a decent understanding of development issues, so you can leverage WPF capabilities to create something which is actually BETTER, instead of just more "colorful", featuring gratuitous animation?
Does some percentage of your target customer base run on integrated graphics chip sets that might not support the features you were planning -- or are they still running Windows 2000, which would eliminate them as customers altogether? Some people would also ask whether your customers actually CARE about enhanced visuals but, having lived through internal company "Our business customers don't care about colors and pictures" debates in the early '90s, I know that well-designed solutions from your competitors will MAKE them care, and the real question is whether the conditions are right, to enable you to offer something that will make them care NOW.
Does the project involve grounds-up development, at least for the presentation layer, to avoid the additional complexity of trying to hook into incompatible legacy scaffolding (Interop with Win Forms is NOT seamless)?
Can your manager accept (or be distracted from noticing) a significant DROP in developer productivity for four to six months?
This last issue is due to what I like to think of as the "FizzBin" nature of WPF, with ten different ways to implement any task, and no apparent reason to prefer one approach to another, and little guidance available to help you make a choice. Not only will the shortcomings of whatever choice you make become clear only much later in the project, but you are virtually guaranteed to have every developer on your project adopting a different approach, resulting in a major maintenance headache. Most frustrating of all are the inconsistencies that constantly trip you up, as you try to learn the framework.
You can find more in-depth WPF-related information in an entry on my blog:
http://missedmemo.com/blog/2008/09/13/WPFTheFizzBinAPI.aspx
WPF requires either Windows Vista or Windows XP SP2, which is not an onerous requirement, but it is a relevant one. If you want to run on Windows 2000 (which some people still do), then WPF won't work for you.
WPF is also a newer technology and not as proven as Windows Forms so you might choose Windows Forms as a less risky option, particularly for larger applications.
That being said, yes WPF is the future. Visual Studio 2010 is being rewritten in WPF, which will probably be the largest WPF application to date and it will also be a real test for the technology.
Obviously, legacy Windows Forms applications would be another situation where it is the correct choice.
As others have said, there are advantages and disadvantages either way you go here. The advantages of WPF, as others have said, include:
The ability to make very rich UIs relatively easily.
Easier animation and special effects
Inherent scalability (use the Windows Vista magnifier tool on a WPF application, and on a Windows Forms application: Note that in the WPF application, all the vector art scales beautifully)
(OPINION ALERT) I feel it's "easier" to do document-oriented systems in WPF
However, there are drawbacks to WPF, where Windows Forms comes out on top:
WPF's in-box control suite is far more limited than that of Windows Forms.
There's greater support in the third-party control space for Windows Forms. (That's changing, of course, but think about it: Windows Forms has been around since 2001; WPF just a few years. By advantage of time, Windows Forms has greater support in the community.)
Most developers already know Windows Forms; WPF provides a new learning curve
Finally, bear in mind that you can create great, attractive and engaging UIs in either tool, if you do the work (or use the right third-party tools). At the end of the day, neither is necessarily better in all circumstances. Use what feels right for the project.
The programming model for WPF is more open and flexible than Windows Forms is, but like ASP.NET MVC, it requires a little more discipline in terms of correctly implementing Model-View-ViewModel patterns.
My first LOB application with WPF ended up as an utter failuire, because it was a resource hog which brought my end-user's very-low-end laptops grinding to a halt... and this was ultimately because I just lept in with WPF + LINQ to SQL and expected a good result... and this is where WPF diverges so strongly from Windows Forms... In Windows Forms, you can get away with that sort of thing. WPF is much heavier on resources than Windows Forms, and if you don't architect your application to be lean, you end up with a 800-pound gorilla.
Don't shy away from WPF... explore it. But be aware that the acceptable sins of Windows Forms coding won't produce good results in WPF. They're fundamentally different engines, which lend themselves to fundamentally different coding patterns.
Last Word: If you do go ahead with WPF, get well acquianted with data virtualization for use with lists and grids. What is a simple data-bound ListItem or GridCell ends up being a hefty logical + visual object-graph in WPF, and if you don't learn how to virtualize, you application won't perform well on large data sets.
There is a very steep learning curve to WPF, and I recommend you get the obvious books first (Adam Nathan,
Sells/Griffiths, and
Chris Anderson) and
blogs (Josh Smith, etc.). Just be prepared for it, and make sure your project allows you the time to learn WPF.
In addition to learning the technology, spend some time learning the patterns used to construct WPF applications. Model View ViewModel (MVVM) seems to be the one that has gained a great deal of acceptance.
Personally, I think WPF is worth it but be forewarned. Also note that you effectively restrict your users to Windows XP SP2+ and Windows Vista. We've made that decision, but you may have some different requirements.
Both of technologies have their pros and cons. In a large application with a "classic" UI I'd use Windows Forms. In an application which require a rich user interface (skinning, animations, changing user interface) I'd choose WPF. Please check the article WPF vs. Windows Forms comparing WPF and Windows Forms.
Aside from the flexibility in UI design, there are some technical advantages to WPF:
1.) WPF doesn't rely on GDI objects. Well, I think it uses 2 GDI objects for the instance of the window itself, but that's practically nothing. I've been involved to a certain extent in a very large internal Windows Forms application. The people in our office sometimes run 3 or 4 instances of it simultaneously. The problem is that they frequently run into the 10,000 GDI object limit inherent to Windows 2000, XP and Vista. When that happens the entire OS becomes unresponsive and you'll start to see visual artifacts. The only way to clear it up is to close applications down.
2.) WPF utilizes the GPU. The ability for WPF to off-load some of the UI processing to the GPU is brilliant. I only expect this aspect of it to get better with time. As a former OpenGL programming hobbyist I can appreciate the power that comes from the GPU. I mean, my $100 video card has 112 cores running at 1.5 GHz each (and that's not top of the line by any means). That kind of parallel processing power can put any quad-core CPU to shame.
However, WPF is still pretty new. It won't run on Windows 2000. And in fact, a WPF application can be slow to start up after a fresh reboot. I talk about all of this on my blog:
http://blog.bucketsoft.com/2009/05/wpf-is-like-fat-super-hero.html
I think it is worth learning WPF. Once you are up to speed, design work on your forms is much easier IMHO. I wouldn't worry as much about the 'sexy' stuff. Most of this is just a fad. You can make 'normal' Winforms-style applications very quickly and easy in WPF.
The whole concept lends itself to easier design IMO.
I don't agree with some of the answers here. WPF is really well suited for line of business (LOB) applications. (The frog design LOB client is the best example). And besides all the possibilities to have your UI be eye candy (which is not necessary in business applications), WPF offers a lot more for you.
The data binding and templating features are just superior to Windows Forms. It also offers a far better way for separating code and presentation.
We've successfully used WPF for 2 LOB applications in teams with no more than 2-3 developers.
The biggest problem you will face is probably the steep learning curve of WPF (compared to Windows Forms) which will decrease development speed with developers not used to WPF.
We are currently rewriting our application in WPF from Windows Forms. Yes, there is a steep learning curve and you have to "re-learn" some things, but it is so worth it. And combined with WCF, we are finding we are writing less code, faster, and more robust than ever before.
Stick with it for a while, read Adam Nathan's book, and check out the ever growing library of third-party controls like those from Telerik and ComponentOne. One negative, in my view, is that the design tool, Expression Blend, is very awkward to use. The latest version is still in beta, but it just doesn't feel right to those of us who have used Visual Studio for years. Yes, it's mainly for designers, but some things you just can't do in Visual Studio.
Consider WPF if interface design is important to you, because WPF can deliver better UI experience. But Windows Forms has on its side the years of evolution, so it's proven to work and you can find many versed programmers for that platform.
Also portability may be an issue, WPF only works with Windows XP SP2 and up.
Also, WPF has a steep learning curve, meaning it's not easy to deliver a quality product without having specific WPF experience.
Well, one answer is "when you have to support 1.1 or 2.0", since WPF is part of .NET 3.0. There are known OS limitations for WPF, and there is an obvious skills issue: if you have a team of developers that know winforms, then it may be easier to turn out robust code with winforms. However, if you are writing a lot of UI code it is probably worth beginning to pick up WPF at some point.
WPF also shares a lot in common with Silverlight, so it has transferable benefits.
WPF comes with many advantages such as superb data binding features,
separation of concerns, separation of design and logic etc...
As a developer I enjoy the ability to define my UI using XAML as opposed to
being tied to the Windows Forms designer and I feel good knowing I can count
on another designer to make my app look good.
Personally I don't care older versions of Windows are not supported,
but one of the big problems with WPF is that is is not (currently/ever) supported
by Mono (http://www.mono-project.com) so WPF apps will not run on Mac OS or Linux.
(Altough Silverlight applications will).
If you have the time and resources to invest in learning WPF, do it!
Even if you're going to be writing Silverlight applications to support multiple OS's.
If you need desktop applications to run on multiple OS's stick with SWF.
There are many differences. We loved WPF for:
The declarative style of programming.
Animations and state transitions
Expression Blend is a great tool
Good style support.
However, we stuck with Windows Forms because:
The extra time it takes for a
developer to learn WPF when they
already know Windows Forms.
WPF will not run on Windows 2000 or
lower.
The biggest consideration when deciding which one to use is to consider what .NET Framework your target audience have installed. I find that more people have the lower .NET Framework versions that only support Windows Forms, but that's just my personal experience.
The advantages of WPF is that it is much easier to create nice looking GUI's with custom controls and animations. WPF also helps further serparate the presentation and logic layers. If you have designers, it allows you to farm of 95% of this work to non-coders and allows the coders to work on logic. The disadvantages are the software costs for Expressions Blend, and the lack of any of the Visual Studio code profiling tools working well as they tend to get caught up in the frameworks calls in trying to render XAML. I am sure there are others but these were the only two we really saw.
The main consideration is if you wish to require your customers to have to install .NET 3.0 or even better .NET 3.5 SP1. You will get some niegative feedback
WPF makes it much easier to hand off the forms design work to an actual designer, not a developer in designer's clothing. If that's something you'd like to do, WPF is your answer. If the classic Windows styled buttons are fine, then Windows Forms is probably the way to go.
(Multiple answers make the claim that you should use WPF if interface design is "important to you" but that's pretty vague. Interface design is always "important".)
If you have an MSDN license, check out Expression tools. It's designed explicitly for WPF, exports directly to Visual Studio and it may help ease your transition.
If you only care about supporting Windows and don't mind the time it takes to learn it, go with WPF. It's fast, flexible, easy to reskin, and has great tools to work with it.
As a side bonus, Silverlight is based on WPF and starting with either lets you gain the know how for working with the other. If things continue to go web based, having prior knowledge (and a library of existing code) to transfer easily to the browser (or Windows Live Mesh) might help give your software an extra lease of life.
If you decide to go with WPF, considering pros and cons already explained in the above answers, I highly recommend going through this dnrTV episode with Billy Hollis
In DotNetRocks episode 315, Brian Noyes discusses this extensively.
There is a known issue with text rendering in WPF. Many users report that the heavy use of anti-aliasing and pixel-blending used causes blurry text. This is a big deal breaker in some circumstances and, as far as I know, has been acknowledged by Microsoft at some level.
For the last 3 1/2 years I've been doing Windows Forms development (at two companies). Both applications were used extensively and ended up having GDI problems. Large Windows Forms applications will eventually run out of GDI resources - causing the end user to have to reboot.
Scott is complaining about Expression Blend and how it doesn't make sense to him as a developer. My first reaction to Expression Blend was like that. However, now I see it as an invaluable tool, but it really depends on what type of developer you are.
I am user interface developer that has had to perform the Integrator role, and I eventually found Expression Blend invaluable to create styles, and control templates in a WYSIWYG manner. I almost always have Expression Blend and Visual Studio up an running on the same project at the same time.
I also think that playing around in Expression Blend and taking a look at the XAML that gets spit out is an excellent way to learn the WPF API ... much like using the designer in Windows Forms and checking the C# code it spits out is helpful in learning how to use whatever you are designing there.
Expression Blend is helpful. Just give it a try, especially if you are working on the visuals for the application.
A quote from an earlier post from Mark:
In Windows Forms you design your user interface, then write code to drive that user interface, which generally also includes code to drive your data objects.
In WPF you invest in the business layer that drives your data objects, then design an interface that listens to your data objects.
I would argue that this is more of a design choice, rather than whether or not you are using Windows Forms or WPF. However, I can appreciate that certain technologies might be better suited for a particular approach.
Only if you don't have WPF expertise and you don't want to invest in it :)