Creating .NET MAUI Project sometimes causes error *.png is being used by another process #25374
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… by another process Fixes dotnet#25207 Context dotnet/android-tools#245 dotnet/android#9409 So there is a problem where the design time builds (DTB) of android sometimes lock files. This can happen when two processes try to write to the same file. This is not a great experience for our users as it just fails the build. So lets try a few things to fix this. 1. Move the Resizetizer output for a DTB into the android `$(IntermediateOutputPath)designtime` folder. This will keep the DTB files completely separate. This should prevent clashes. 2. Add some retry code to the `SkiaSharpTools.Save` method. This will catch `UnauthorizedAccessException` exceptions as well as specific `IOException` types (Access Denied and Sharing Violation). This will allow us to catch when this happens and retry the write. There is a small delay before attempting to write the file again. Note these code uses the Identical code as we are going to use in Android. We have introduced two new environment variables which can be used to control the new behavior. 1. `DOTNET_ANDROID_FILE_WRITE_RETRY_ATTEMPTS`. Integer, controls the number of times we try to write the file. The default is 10. 2. `DOTNET_ANDROID_FILE_WRITE_RETRY_DELAY_MS`. Integer, controls the delay in milliseconds between retry attempts. Default is 1000ms (or 1 second).
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Fixes #25207
Context
dotnet/android-tools#245
dotnet/android#9409
So there is a problem where the design time builds (DTB) of android sometimes lock files. This can happen when two processes try to write to the same file. This is not a great experience for our users as it just fails the build.
So lets try a few things to fix this.
$(IntermediateOutputPath)designtimefolder. This will keep the DTB files completely separate. This should prevent clashes.SkiaSharpTools.Savemethod. This will catchUnauthorizedAccessExceptionexceptions as well as specificIOExceptiontypes (Access Denied and Sharing Violation). This will allow us to catch when this happens and retry the write. There is a small delay before attempting to write the file again.Note these code uses the Identical code as we are going to use in Android. We have introduced two new environment variables which can be used to control the new behavior.
DOTNET_ANDROID_FILE_WRITE_RETRY_ATTEMPTS. Integer, controls the number of times we try to write the file. The default is 10.DOTNET_ANDROID_FILE_WRITE_RETRY_DELAY_MS. Integer, controls the delay in milliseconds between retry attempts. Default is 1000ms (or 1 second).