Visual Studio
A family of Microsoft suites of integrated development tools for building applications for Windows, the web and mobile devices.
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VS2019 C# Designer not working
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(256, 42%, 34%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EPV%3C/text%3E%3C/svg%3E)
Paul van der Westhuizen
6
Reputation points
When opening designer mode I get this error.
System.Exception
The app didn't start. (Exception from HRESULT: 0x8027025B)
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.VisualStudio.DesignTools.UwpSurfaceDesigner.SurfaceIsolation.UwpSurfaceProcess.<SafeCreateViewAsync>d__46.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at Microsoft.VisualStudio.DesignTools.UwpSurfaceDesigner.SurfaceIsolation.UwpSurfaceProcess.<SafeCreateViewAsync>d__46.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.UwpSurfaceDesigner.SurfaceIsolation.UwpSurfaceProcess.<Initialize>d__60.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at Microsoft.VisualStudio.Telemetry.WindowsErrorReporting.WatsonReport.GetClrWatsonExceptionInfo(Exception exceptionObject)
--- End of stack trace from previous location where exception was thrown ---
at Microsoft.VisualStudio.Telemetry.WindowsErrorReporting.WatsonReport.GetClrWatsonExceptionInfo(Exception exceptionObject)
Visual Studio
Visual Studio Debugging
Visual Studio Debugging
Visual Studio: A family of Microsoft suites of integrated development tools for building applications for Windows, the web and mobile devices.Debugging: The act or process of detecting, locating, and correcting logical or syntactical errors in a program or malfunctions in hardware. In hardware contexts, the term troubleshoot is the term more frequently used, especially if the problem is major.
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(9.6, 11%, 10%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EDZ%3C/text%3E%3C/svg%3E)
Dylan Zhu-MSFT 6,406 Reputation points2020-08-27T07:18:39.777+00:00 Hi PaulvanderWesthuizen-2004,
Is you project a uwp project? If so, please try to change your target version and minimum version of your project. If not, could you please provide more details about your project, which could help us to solve it.
Best Regards,
Dylan -
Dylan Zhu-MSFT 6,406 Reputation points
2020-09-02T08:26:08.61+00:00 Hi,
Is there any update about this issue? Maybe you could try to create a new project to check if the designer could work.Look forward to your reply.
Best Regards,
Dylan
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