Building project with CefSharp fails to build until I restart visual studio

[davkean]

From @maxinfet on October 23, 2018 19:23

Issue

In 15.7.6 the reproduction project I linked bellow builds every single time even when restoring nuget packages. As of 15.8.6 the first build will fail with the following error The tag 'ChromiumWebBrowser' does not exist in XML namespace 'clr-namespace:CefSharp.Wpf;assembly=CefSharp.Wpf'. After I perform another rebuild it will build fine.

For our main solution it does not matter how many times we rebuild it will not build until we follow the steps in issue #3930. When we were on 15.8.5 we got a different set of errors, but on 15.8.6 we get the same error as my reproduction project.

Solution Details

• Our solution uses the legacy project system
• We use package.config to restore our nuget packages

Error Details

This issue is happening during MarkupCompilePass1. This output is from a reproduction project I put here.

Restoring NuGet packages...
To prevent NuGet from restoring packages during build, open the Visual Studio Options dialog, click on the NuGet Package Manager node and uncheck 'Allow NuGet to download missing packages during build.'
NuGet package restore finished.
1>------ Rebuild All started: Project: ReproductionApplication, Configuration: Debug x86 ------
1>Build started 10/23/2018 3:14:42 PM.
1>GenerateBindingRedirects:
1>  No suggested binding redirects from ResolveAssemblyReferences.
1>C:\Perforce\ReproductionApplication\15.8.6\ReproductionApplication\MainWindow.xaml(11,10): error MC3074: The tag 'ChromiumWebBrowser' does not exist in XML namespace 'clr-namespace:CefSharp.Wpf;assembly=CefSharp.Wpf'. Line 11 Position 10.
1>
1>Build FAILED.
1>
1>"C:\Perforce\ReproductionApplication\15.8.6\ReproductionApplication\ReproductionApplication.csproj" (Rebuild;BuiltProjectOutputGroup;BuiltProjectOutputGroupDependencies;DebugSymbolsProjectOutputGroup;DebugSymbolsProjectOutputGroupDependencies;DocumentationProjectOutputGroup;DocumentationProjectOutputGroupDependencies;SatelliteDllsProjectOutputGroup;SatelliteDllsProjectOutputGroupDependencies;SGenFilesOutputGroup;SGenFilesOutputGroupDependencies target) (1) ->
1>(MarkupCompilePass1 target) -> 
1>  C:\Perforce\ReproductionApplication\15.8.6\ReproductionApplication\MainWindow.xaml(11,10): error MC3074: The tag 'ChromiumWebBrowser' does not exist in XML namespace 'clr-namespace:CefSharp.Wpf;assembly=CefSharp.Wpf'. Line 11 Position 10.
1>
1>    0 Warning(s)
1>    1 Error(s)
1>
1>Time Elapsed 00:00:00.65
========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========

Copied from original issue: dotnet/project-system#4158

[davkean]

Actually, moving this back - looks like a project-system issue.