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The type forwarder for type 'Windows.Foundation.IAsyncOperation`1' in assembly 'Windows' causes a cycle

See original GitHub issue

I’d like to use await with IAsyncOperation. after I added

c:\Program Files (x86)\Windows Kits\10\UnionMetadata\Facade\Windows.WinMD
c:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETCore\v4.5\System.Runtime.WindowsRuntime.dll

I got:

The type forwarder for type 'Windows.Foundation.IAsyncOperation`1' in assembly 'Windows' causes a cycle

Issue Analytics

State:
Created 7 years ago
Reactions:1
Comments:15

Top GitHub Comments

9reactions

TechnikEmpirecommented, Apr 15, 2018

@JamesEarle @bao-qian the instructions in this repo and on the nuget site are wrong. You do not manually add the facade for the API you need. This is what causes the circular reference.

You simply add the full Windows.winmd at C:\Program Files (x86)\Windows Kits\10\UnionMetadata\10.0.16299.0\Windows.winmd and System.Runtime.WindowsRuntime. That’s it. Note when I say “full”, I mean the .winmd file should be a few megabytes. There’s plenty of them with the same name sprinkled around that are a few kb and it’s easy to screw up and select one of these.

Then, wherever you call await on an IAsyncOperation, make sure you have using System; in the same source file.

Hope this helps people.

9reactions

TechnikEmpirecommented, Mar 9, 2018

This issue is currently crushing my hopes and dreams.