Intercept the call to an async method using DynamicProxy

Question

Below is the code from the Intercept method on a custom type that implements IInterceptor of the Castle Dynamic Proxy library. This snippet is from

Answer 1

   void IInterceptor.Intercept(IInvocation invocation) {
       try {
           invocation.Proceed();
           var task = invocation.ReturnValue as Task;
           if (task != null && task.IsFaulted) throw task.Exception;
       }
       catch {
           throw;
       }
   }

Answer 2

Having a need to intercept methods returning Task<TResult>, I've created an extension to Castle.Core that simplifies the process.

Castle.Core.AsyncInterceptor

The package is available to download on NuGet.

The solution is largely based on this answer from @silas-reinagel, but simplifies it by providing a new interface to implement IAsyncInterceptor. There are also further abstractions to that make interception similar to implementing Interceptor.

See the readme of the project for further details.