ASP.net app crashes - Could not load file or assembly 'Microsoft.Threading.Tasks.Extensions.Desktop'

Question

I want to build a Google BigQuery C# ASP.net application using OAuth2 and the .Net 4.5 framework. I ran these NuGet installs

Install-Package Google.Apis.Bigq         


        

Answer 1

I already encountered this error before. It looks like the Bcl.Async package contains a reference to Microsoft.Threading.Tasks.Extensions.Desktop when you run a .NET 4.0 applications but somehow it is missing in .NET 4.5 application.

My advice for you (until I'll figure our with the owner of Microsoft.Bcl.Async why it happens) is to copy Microsoft.Threading.Tasks.Extensions.Desktop from packages\Microsoft.Bcl.Async.1.0.165\lib\net40\Microsoft.Threading.Tasks.Extensions.Desktop.dll to your BIN folder. It should solve this issue.

UPDATE (March 17th): Consider adding the following Post-build event to your project:

copy /Y "$(SolutionDir)packages\Microsoft.Bcl.Async.1.0.16\lib\net40\Microsoft.Threading.Tasks.Extensions.Desktop.dll" "$(TargetDir)Microsoft.Threading.Tasks.Extensions.Desktop.dll"

Unfortunately, there isn't a solution for this problem yet from the owners of the Bcl.Async package.