I want to invoke a general Delegate using async await. I am not working with a prebuilt delegates, but rather the general Delegate class which can receive arguments as an array of objects.
I am doing something like this:
public object InvokeAction(Delegate action, object[] actionArgs = null)
{
if(action == null)
{
return null;
}
return action.DynamicInvoke(args);
}
What I want to do is give an option to run the delegate using await but since DynamicInvoke returns an object, it doesn't have an awaiter.
Is there a way to define a general delegate and make an asynchronous invocation? If not a generic one, is there some version which is close to a generic delegate (It's ok to force the user to some delegate definition) which can be invoked the way I want?
Your delegate needs to return an awaitable type, generally this is Task or Task<TResult>.
You could check for this at runtime:
public async Task<TResult> InvokeAction<TResult>(Delegate action, object[] actionArgs = null)
{
//...
var result = action.DynamicInvoke(actionArgs);
if (result is Task<TResult> task) return await task;
return (TResult)result;
}
However, as long as actionArgs are not modified within your method, you could statically type your delegate, and use a closure:
public async Task<TResult> InvokeAction<TResult>(Func<Task<TResult>> action)
{
//...
return await action();
}
var result = InvokeAction(() => YourMethodAsync(arg1, arg2));
Collected from the Internet
Please contact [email protected] to delete if infringement.
Comments