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

Trying to clarify with a generic and clean solution for:

• Intercepting async methods adding custom code as a continuation task.

I think the best solution is to use the dynamic keyword to bypass the compiler type checking and resolve the difference between Task and Task at run time:

public void Intercept(IInvocation invocation)
{
    invocation.Proceed();
    var method = invocation.MethodInvocationTarget;
    var isAsync = method.GetCustomAttribute(typeof(AsyncStateMachineAttribute)) != null;
    if (isAsync && typeof(Task).IsAssignableFrom(method.ReturnType))
    {
        invocation.ReturnValue = InterceptAsync((dynamic)invocation.ReturnValue);
    }
}

private static async Task InterceptAsync(Task task)
{
    await task.ConfigureAwait(false);
    // do the logging here, as continuation work for Task...
}

private static async Task InterceptAsync(Task task)
{
    T result = await task.ConfigureAwait(false);
    // do the logging here, as continuation work for Task...
    return result;
}