We are developing a windows application using WPF, ASP.NET WebAPI & SQL server. For presentation layer, we are using WPF. Data will be stored in SQL database server. All the data communication between client and server is via Web API. In between, we have a facade layer which plays communication between Web API and WPF.
Customer wants this application as offline version for some users who has very limited internet connection.
I mean, users can enter data without internet connection. When user is connected with internet, all the data should be moved to server.
Please share your idea. If anybody done this, please tell us how to do that.
If my question is not clear, or if you need more details on this, I am ready to explain more in detail.
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I have been developing an asp.net core web application and published on the production mode (online server), the users can access it with the specific domain name and will log in and do data entry from three different countries.
But, the problem is sometimes, in one specific country there is no internet access, my client wants that this application should work online and offline, If there is no internet access the local branch must be able to do data entry, then when the internet gets connected data should send to the online server database,
What is the best way to achieve this goal?
Please write your view or add some good forum link below.
Rationally, it is not possible for you to access a Web App without internet. Web Apps are meant for network usage. However, I believe there is a workaround for such requirements. What you can do is that you can create a clone of your database for the third user, who has no internet access and perform all transactions within the local machine and when the connection comes back on line, you can replicate the data from the local SQL Server into the online server database.
And then there is something called Progressive Web Apps , which will allow you below privileges :
Reliable - Load instantly and never show the downasaur, even in uncertain network conditions.
Fast - Respond quickly to user interactions with silky smooth animations and no janky
Engaging - Feel like a natural app on the device, with an immersive user experience.
What are Progressive Web Applications, Google has something more to discuss here
I have a project has two parts.
1- Windows form or WPF application that basically connects to database and write/read/update some basic text data (this part is already done).
2- On the other hand, I am currently developing an IOS app that can connect to remote database and read/write/update data.
What is the best way to connect the same SQLite or SQL database from both Windows forms app and IOS app.
Thanks in advance
The best way is creating an API/WebService which will be the interface between the database and your clients: WPF, iOS App and any other client you might want to add in the future.
Using a WebService is more secure, I guess you wouldn't want your database username and password being everywhere.
Using a WebService allows you abstract the data layer. Not using an API and using the connection to the database directly from your Apps will tightly couple your apps with the structure of your tables and any single change that happens in the database will force you to do the changes in the apps.
With WebService you decide what information will be available to the ones consuming it.
There are many others Plus on using WebServices but hope this are enough to clear your doubt.
Hey I'm trying to upgrade notifications service that uses task polling to see if there are new messages for a given interval.
My client is a WPF application and WCF in the server side.
I have 2 application servers with windows server 2008 r2 and load balancer between them.
I thought of implementing it with WCF Duplex binding and noticed it will be a problem to manage my users in 2 service instances (since I can subscribe user only to 1 service).
The trigger for sending messages is when data is manipulated by a user and is related to other specific users.
Another important point is that we plan to scrap our wpf application and revise our front end as web project (with angularjs probably..) and our backend from wcf to .net web api.
I read a bit about push techniques and came to this conclusion:
SignalR - the thing is, how will it work with web? (angular.js instead of asp.net)
Wamp - didnt find much about it but it looks promising
Websockets
.NET implementation (requires IIS 8 which means upgrading our servers)
socket.io - simple and great documentation and community. but I'm not familiar with nodejs.
What are your thoughts about how to implement it?
Thanks, Bar
Currently I am developing a WPF application which will handle alot on the client (non business logic that is).
Some data (the business logic) will be coming from a SQL database. To expose this data to the client I was thinking to create a WebService. Normally I would use a WCF Service (or Web Api) to fix this. But in this scenario, there is only a linux server available using a MySQL database, on this server I am unable to host a WCF Service.
I was wondering how I could implement the following:
Users opening the WPF client need to authenticate to the MySQL database.
Users logged in should retrieve some of their personal data coming from the MySQL database.
Which kind of Webservice or technology is the best to go for?
Thanks
You can build a web service in any language, so it comes down to which ones you're comfortable with, or which offer the best tools. If you or your team are already heavily invested in the Microsoft stack, you could try something like Monodevelop: http://monodevelop.com/
Could someone please explain to me in a simple way, what is a web service?
Please correct me if I'm wrong. I have a DB hosted somewhere in the web, and I want to perform DB transactions from a desktop application as well as a mobile application. Can this be done through a web service ? Someone mentioned it to me and I wanted to make sure this could happen.
Here's a good explanation on Wikipedia.
A middle dynamic content processing and generation level application server, for example Ruby on Rails, Java EE, ASP.NET, PHP, ColdFusion platform
The middle tier of a 3-tier application is often the web service
i want to perform DB transactions from a desktop application and a mobile application, can this be done through a web service ?
This is Exactly what a web service is for.
A web service allow you to create multiple front ends if needed, and serve your database data to all of those front ends. You can also open up the API and allow third party developers to access the web service and thereby access the data of your application in a controlled environment.
It's considered a better practice for larger applications to access a web service or a middle tier rather than directly access the database.
In your case, a web service would involve setting up your DB behind a web server that listens for incoming requests, performs the appropriate DB operations, and returns whatever data is appropriate. Then, your desktop and mobile applications could send a http request and the DB would respond appropriately. This would let all your applications access the same DB.