Failed to load the XAML Designer suddenly.

[J Han]

Thanks in advanced.

I am developing my own application using WPF C#, dot Net Core3.1.

I did many jobs for it for about 2 month.

And today VISUAL STUDIO 2019 cannot load the designer for XAML.

I can build and run my application but I cannot look my XAML design preview.

This is messages I got.


An Unhandled Exception has occured

...

System.IO.DirectoryNotFoundException

Could not find a part of the path 'C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\Common7\IDE\SurfaceProcess\Wpf\Core\x64'.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileSystemEnumerableIterator`1.CommonInit()
at System.IO.FileSystemEnumerableIterator`1..ctor(String path, String originalUserPath, String searchPattern, SearchOption searchOption, SearchResultHandler`1 resultHandler, Boolean checkHost)
at System.IO.Directory.EnumerateFiles(String path)
at Microsoft.VisualStudio.DesignTools.XamlDesignerHost.Platform.ShadowCopy.WpfCoreShadowCopyWorker.CopySurfaceProcessPayload(CancellationToken cancelToken)
at Microsoft.VisualStudio.DesignTools.DesignerHost.HostServices.HostPlatformBase.EnsureSurfaceProcessPayload(IHostProject hostProject, SurfaceProcessInfo info, CancellationToken cancelToken)
at Microsoft.VisualStudio.DesignTools.DesignerHost.HostServices.HostPlatformBase.<EnsureShadowCacheContent>d__27.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.VisualStudio.DesignTools.DesignerHost.HostServices.HostPlatformBase.<CreateSurfaceProcessAsync>d__26.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.VisualStudio.DesignTools.SurfaceDesigner.Documents.SurfaceIsolation.SurfaceProcessContext.<EnsureSurfaceProcessAsyncCore>d__104.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.VisualStudio.DesignTools.SurfaceDesigner.Documents.SurfaceIsolation.SurfaceProcessContext.<EnsureSurfaceProcessAsyncInternal>d__102.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.VisualStudio.DesignTools.XamlSurfaceDesigner.Views.IsolatedSurfaceImageHost.<CreateSurfaceAsync>d__66.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at Microsoft.VisualStudio.Telemetry.WindowsErrorReporting.WatsonReport.GetClrWatsonExceptionInfo(Exception exceptionObject)

System.AggregateException
One or more errors occurred.




I googled for several times. But this problem is occurred not so much.

Please help me!

Thank you!!

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