Error "Cannot access a closed Stream" when building WinUI app

[Juriyx]

Hello. I build a WinUI app in Azure DevOps with Debug configuration and got such error on a build step:

Unhandled Exception: System.ObjectDisposedException: Cannot access a closed Stream.
   at System.IO.__Error.StreamIsClosed()
   at System.IO.MemoryStream.Write(Byte[] buffer, Int32 offset, Int32 count)
   at System.IO.StreamWriter.Flush(Boolean flushStream, Boolean flushEncoder)
   at System.IO.StreamWriter.Write(Char[] buffer, Int32 index, Int32 count)
   at System.IO.TextWriter.SyncTextWriter.WriteLine(String value)
   at System.Console.WriteLine(String value)
   at Microsoft.Build.CommandLine.MSBuildApp.Execute(String commandLine)
   at Microsoft.Build.CommandLine.MSBuildApp.Main()

Below is the pipeline I use:
Windows app distribution (Debug).txt

[jeromelaban]

Thanks for the report. Are you able to provide a binlog? Could you also specify which step is causing this issue?

[jeromelaban]

Thanks for the update. I'm not able to reproduced this issue, and this is a .NET issue we have no control over.

I'd suggest trying not using the msbuild task, but rather call msbuild directly from a powershell or cmd task, it may change the behavior.

[Juriyx]

Interesting tip) I'll give it a try and report back on the result. Thank you!

[Juriyx]

I'd suggest trying not using the msbuild task, but rather call msbuild directly from a powershell or cmd task

Unfortunately, I haven't found the working way to call msbuild. It seems that it is not added to the system's PATH for some reason. What can be done regarding this?

[jeromelaban]

You need to find msbuild using vswhere:

uno/build/test-scripts/run-netcore-mobile-template-tests.ps1

Line 22 in b9ecb08

$msbuild = vswhere -latest -requires Microsoft.Component.MSBuild -find MSBuild\**\Bin\MSBuild.exe

[Juriyx]

Thanks, @jeromelaban! After this task implementation, we were able to see errors and fix the build

[jeromelaban]

Thanks for the update. What change did you have to make?