Is there any way to force the WPF designer to reload or refresh, without rebuilding the entire project or solution?
If there's an error, I get an option in the designer view to refresh the designer. But if I don't have an error, how can I get the designer to refresh after I've made a change?
I'm a little late but this is the best solution1 I've found so far: whenever the designer does stupid stuff, I just kill it's process.
Press Ctrl+Shift+Esc
Navigate to the Processes tab.
Kill XDesProc.exe
This also fixes issues for the properties window (like when it gets jammed and you can't type stuff into it).
1 This is a solution for designer issues. Your issues may also be caused by compilation problems, in which case just right click on the solution in the solution explorer, and clean it. The reason behind it is that sometimes the compilation loses synchronicity with the generated files from XAML, and cleaning the solution just deletes those intermediate files; it's like a reset so your compilation can start off with a clean slate.
To do it fast:
Comfortably it's usually the last one if sorted alphabetically.
When it is, it's almost like a ritual for me to quickly pop up the task manager, click any process, press End, Delete, Enter (done), Esc (exit task manager). Instead of restarting VS and waiting for all the loads & unloads, you can do that in 1-2 seconds.
In newer versions of Visual Studio there is an icon on the bottom of the designer to "Disable Project code". If you toggle this off and on it will reload the designer.
You can add this to the Tools menu in Visual Studio.
Once configured, use Tools..XAML Designer Restart:
Alt+T then L
I tried configuring it for Alt+T then X but this clashed with Tools..Choose ToolboX Items.
Update
These days, I prefer to just hit Ctrl+Shift+Esc to bring up the process manager, then X to skip to XDesProc.exe then Delete to kill the rogue process(es).
The Visual Studio designer attempts to keep the rendered view in sync with the XAML. That's the advertised behavior.
The first thing you should check is that there are no errors in the errors window. It may be something as simple as a missing angle bracket.
The second thing to check is whether you have any code (other than your code-behind) which needs to be compiled for the designer to render your XAML correctly. This includes any of your own datatypes that you instantiate in XAML, any custom controls you have written (e.g. MyTextBlock derived from TextBlock), or any classes directly or indirectly in support of design-time data. If so, you need to rebuild your project.
The last thing to check for is possible bugs in the designer. In spite of the advertised behavior, the designer may get out-of-sync due to bugs. In that close, close the XAML window and re-open it. Other tricks that might work are selecting the XAML tab and then the Design tab, or maximizing the XAML pane.
As far as rebuilding your application goes, you don't need to do this as a habit. You only need to recompile it when the above conditions apply. Once they don't apply, you can just edit the XAML. Another way to say this is that if you haven't modified code, you shouldn't need to rebuild (modulo bugs).
I'm not sure, but I think a build will refresh your view in that situation.
There is any event handled in that XAML file, then mostly it will not display the design preview from Visual Studio. If you want to see the design from Visual Studio, try with Command Binding instead of event, you will see the preview.
I'm not sure how this works in WPF editing, but with ASP.NET pages when the design view wont update i can do 2 things
Exit Visual Studio and restart
Go into source view (not split), type something and remove it (not by undoing, just delete or backspare) and save it. Then return to design view, usually the view has been updated then.
When you add a new row of code or a new object, XAML designer is sync but I encountered non-sync behavior when a property of an object is changed.
A tricky way is that when you change a property you only need to remove a ">" character from end of an instruction then retype it.
On the toolbar in the XAML designer, choose the "Disable project code" button to reload the designer link which stays on the right side of "Turn on snapping to snaplines".
Disable project code in the designer
If it is disabled, you can try to check the configuration manager and change processors to "Any CPU".
For projects that target ARM or X64 processors, Visual Studio cannot run project code in the designer, so the Disable project code button is disabled in the designer. Check this:
Debug or disable project code in XAML Designer
For information, I had the same issue with the XAML Designer of Visual Studio Community 2017, i.e. sometimes the designer doesn't show anything, the easiest solution is then to close the XAML file and reopen it.
I also frequently get the exception "An Unhandled Exception has occurred - Click here to reload the designer - Details: The XAML Designer has exited unexpectedly" (the click restarts the designer successfully).
Note that, in this VS version, the process of the XAML designer is not named XDesProc.exe, but UwpSurface.exe. If you prefer or have to kill the process, then the designer shows the same exception as above, and you may restart it.
use process hacker and kill the WpfSurface process (blend only)
Update for designer refresh/reload Visual Studio 2022 Xamarin, taskkill /IM java.exe
Related
I know there are a lot of problems like that and you all might think this is a duplicate but NO... this problem is different.
When I add a custom user control to a project and rebuild it, the control is added to the toolbox. If I try to add another one it does not show up in the toolbox. If I close visual studio and reopen it the first control also was removed from the toolbox and will never appear again. From now on the project is broken and no control added, remove + readded will ever show up in the toolbox. So I create a new project and it starts from the beginning.
Before this tip appears I'll say it: Automatically Populate Toolbox is True. Nothing helps against this problem. Build Project/Solution, Rebuild, Clean+Rebuild, Restart of VS, Restart of Computer, Unload and reload the project, set toolbox back to default. Nothing works.
Any ideas??
You have to remember that the designer call your code constructor and some other methods at design time.
If you build the code and the control does not appears and it has not been hidden by an attribute, then probably the code you wrote is not compatible with the designer. For example, the control might throw an exception in design mode because of incorrect code.
The attribute is [ToolboxItem(false)]. If you have a base class that hide it, it will also be hidden in derived class if not specified otherwise.
You will have the same problem if that control is used in another component. You won't see it if it does not compile and run correctly.
The trick to debug that kind of problem, is to attach a debugger from a second instance of Visual Studio to find where in your code you throw an exception.
If the control does not work at run-time, better to fix that first as if it also fix design problem, it is simpler to debug that way.
Otherwise, you have to ensure that your project dependencies are correct. The toolbox will only shows component from DLLs that are referenced by the current project (or from itself I think).
I have no clue how long this feature/option has been around but my mouse happened to pause over this button within the WPF designer early and now I'm curious what it's purpose is.
Hovering over the button, Visual Studio pops up a tooltip that says Enable project code. When I click on it, the designer seems to reload the xaml contents but I can't tell what's changed.
What does this feature do?
2020 EDIT
It's been years since I've had to work in XAML, but I've received a new project where I need to work in XAML. This feature/button seems to have disappeared. Where has it migrated?
What does this feature do?
It enables or prevents the designer from running your code in the background.
Disabling project code can lead to a loss of design time data and enabling it can lead to unhandled exceptions in the XAML designer.
These exceptions are usually caused by code that attempts to access properties or methods which work differently when your application is running in the designer compared to when it runs as a built executable.
Debugging or Disabling Project Code in XAML Designer: https://msdn.microsoft.com/en-us/library/mt622752.aspx?f=255&MSPPError=-2147217396
The best way to explain this is to describe how I can reproduce the problem at will.
Open an existing Windows Form file in the designer
Open the toolbox and click a custom UserControl
Click in the form in the designer to add it
VS2013 hangs (does NOT crash); kill VS2013 and relaunch it
Open the form again
Reset the toolbox and re-add the DLL that contains my custom UserControls
Try adding the control to the form--it works just fine!
Close VS2013
Open VS2013
Repeat the task of adding the custom UserControl to a form
VS2013 hangs
So, the moral of the story is that after closing and reopening VS2013, any attempt to add a custom usercontrol will hang VS2013, and the only way to remedy it is to reset the toolbox and re-add the usercontrol DLL; that remedy only lasts until VS2013 is exited and launched again.
Lots of googling has yielded suggestions regarding using a second VS instance to attach to the first and see the exception that is thrown, but there's no exception being thrown; the application just hangs.
The one thing I found that most-closely described my issue turned out to be related to some remote-desktop software that I'm not using.
Anybody got any ideas? I haven't tried reinstalling Visual Studio, as that represents a fairly significant amount of down-time. Last resort sort of thing (and I've read some things that indicated it won't be helpful).
Edit: Apparently sometimes the reset/re-add doesn't make it better.
Edit: Some additional things I should have mentioned:
There is no devenv.exe when I try to use a second VS instance to
debug, so I end up choosing WDExpress.exe
The particular user control is mature and has not changed recently, and is in use on many forms in the project
The issue only occurs when adding a new instance of the control; the hang does not occur simply by attempting to launch the designer for a form that already contains one.
The latest VS2013 update may have fixed it; it's not happening right now and I don't want to anger the gods by trying to reproduce it again until I get my work done.
Hanging Visual Studio with a custom UserControl is very easy to do. A simple example is all it takes, double-click the design surface and write:
private void UserControl1_Load(object sender, EventArgs e) {
while (true) { }
}
Compile and drop the added control from the top of the toolbox and drop it on a form. Show is over.
You probably did not spend enough time using the guidance you already found or we'd have a stack trace to look at. Attaching a debugger is easy enough and you'd be ahead if the code throws an exception. But it doesn't, a hang like this doesn't throw. Exercise debugging this particular simple hang to find out how to do it:
Start VS again, Debug > Attach to Process > select devenv.exe
Important: click the Select button above the process list. You'll need to select the "Debug these code types" radio button and tick "Managed (v4.5, v4.0)" as well as "Native". Now click Attach.
Give it time to load the symbol files, takes quite a while, especially if that was never done before.
Use Debug > Break All.
If you are lucky then it now stops on the exact statement that causes the hang. Likely in this case. This is however not guaranteed, it might also break on one of the many threads that are running inside devenv.exe, which ever happened to be active at the exact moment the debugger broke in.
In which case you need to use Debug > Windows > Threads to select the thread on which the UserControl code is running. Should be the one labeled "Main Thread". Double-click it.
If the editor doesn't switch to the source code file with the hang then use Debug > Windows > Call Stack to get insight in how the hang occurred. Update the question with that trace if you need more help.
In general, prime candidates for code in your UserControl that can cause the hang are its constructor, its Load event and its Paint event. Use the DesignMode property to bypass dangerous code that is not likely to work well when it runs inside the designer instead of the regular process. And beware of the chicken-and-egg problem, if you have a plain bug in your UserControl then it can easily strike first at design time, before you get a chance to debug it like you normally would. Disabling chunks of code may be necessary to increment towards the bug, use DesignMode to get there.
One more detail, this is tagged [c++-cli]. You must select the old debugging engine to debug C++/CLI code. Tools > Options > Debugging > General > tick the "Use Managed Compatibility Mode" checkbox.
The issue seems to have vanished subsequent to updating VS2013 to 12.0.40629.0 Update 5, found by selecting TOOLS > Extensions and Updates, then selecting Updates on the left.
It may not work in all cases of seemingly-inexplicable UserControl-incited hangs in the Designer, but it seemed to solve the problem for me. I'm putting this here (rather than deleting the question) in case my experience can help someone else.
We do MVVM and use DI in our WPF project. Now we are working on VS 2012. Whenever we open the views (XAML forms) the XAML designer shows the loading message. Then whenever we try to change the XAML code panel VS hangs (While it is froze on loading message). XDesProc.exe takes about 13% of CPU (As I have 8 cores so it takes 100% of a core). When I close it, VS goes out of halt. But if you change the XAML code the scenario will be repeated again.
We didn't have any problem with VS 2010 in the same situation.
What is wrong?
A work-around is described in this thread:
Visual Studio 2012 hangs on editing XAML
To summarise you can make VS not use the XAML designer, and just use the regular source editor:
Right-click on a XAML file in the Solution Explorer
Select "Open With..."
Select "Source Code (Text) Editor"
Click on "Set as Default"
Click OK
You're done!
I have the same issue on one of my views. It is not really a solution but i noticed that, when I comment out the DataContext Property, the cpu load is gone.
Open Xaml file (cpu load is rising)
Comment out DataContext property with viewmodel binding
Kill XDescProc.exe in TaskManager
Reload Designer (no cpu load)
Try installing the latest update to Visual Studio Update 1. If after the update it still occurs submit the issue to Microsoft Connect.
Make sure you that, if you have any code in the constructor or any other code that might execute in the designer, you detect the design mode and do not execute that code.
You might be connecting to a data source and the designer might be choking on that.
See: Is there a way to check if WPF is currently executing in design mode or not?
Our computer's VS2012 has updated to Update 4, but it is still hangs on loading XAML designer..
Has anyone else experience incredibly slow performance in the XAML editor in VS 2010? If I have a new project with a limited number of files, the performance is fine. However, if I have a project with a larger number of XAML files, the XAML editor hangs intermittently every few seconds, making it almost impossible to use.
I should also note that the performance is only slow in one particular project where I am referencing DevExpress 2010. I am not certain if this is related.
Any suggestions on solutions to this problem would be greatly appreciated.
Chris
In Visual Studio 2012:
Go to
Tools > Options > TextEditor > XAML > Misc
Check Always open documents in XAML view and uncheck Automatically populate toolbox items.
In Visual Studio 2015, 2017:
Go to
Tools > Options > XAML Designer
uncheck Automatically populate toolbox items.
This fixed my same problem.
If you don't need the visual designer, you can select a different editor in visual studio:
Right click the xaml file -> Open With... -> Source Code (Text) Editor
You will only lose the split view, intellisense etc. should still work.
If you need to check something in the designer you can still click 'view designer' to open the normal XAML editor again.
If you want to improve the performance of the visual designer, try checking DesignerProperties.GetIsInDesignMode in your code-behind. The visualiser instantiates your controls to know how to display them, thus executing parts of the code-behind.
Like the OP, I had extreme lag in the xaml editor on a project that relied heavily on DevExpress WPF controls. After trying unsuccessfully to resolve this issue with the other solutions posted here, I eventually tried deleting my Solution User Options (.suo) file, which is usually located in the same folder as the solution (.sln) file. This immediately resolved the issue. You may want to read this post about what visual studio stores in the suo file so you can reset anything important (such as build configuration - mine always defaults the active solution platform back to "Mixed Platforms" for example)
Short answer: if you do not use designer much, just replace the default editor for XAML, thus getting rid of XAML visual designer and speeding things up. Right click any XAML file, click Open with... and choose another default editor. Source code (text) editor works just fine.
Now it should be already fine. If you want to understand the details and completely get rid of the slow designer, read the long answer.
Long answer: Here is a nice explanation of what happens and why is it that slow.
A brief todo based on the aforementioned article in order to completely disable the visual designer of XAML:
Under Tools->Options->Text Editor->XAML->Miscellaneous->Default View check Always open documents in full XAML view
Open Task manager and end XAML Designer process XDesProc.exe (Note: for VS2013 right click this process and go to containing folder. Rename the exe to sth else, than end the process)
Standard XAML editor will load this process again (I guess it will not succeed with VS2013 and actions done in P.2). However, right click any XAML file, Open with... and choose another default editor. Source code (text) editor works just fine.
While using dev express, I've noticed some laggy response in the Visual Studio designer. This appears to be due to the license authentication of the DevExpress products.
If you delete the "Licenses.Licx" file (found in the project properties folder) you'll notice a marked improvement in performance.
Note: Removing the license file doesn't stop you from using DevExpress controls. But it does stop VS from constantly authenticating it.