如何在匿名委托中调用异步方法？

Question

I have a function takes a delegate as input parameter.

public delegate bool Callback();

public static class MyAPI
{
     public static handle(Callback callback) {
           ... 
     }
}

So I call the api with an anonymous delegate like this

MyAPI.handle(delegate
{
    // my implementation
});

My question is how can i call an async method in my anonymous delegate?

MyAPI.handle(delegate
{
    // my implementation
    await MyMethodAsync(...);
});

I get an error saying the 'await' operator can only be used within async anonymous method'?

The function MyAPI.handle() only expect a non async delegate. I can't change that method. How can I fix my problem?

Thank you.

Answer 1

You could call an asynchronous method by passing an async lambda expression:

MyAPI.handle(async () =>
{
    // my implementation
    await MyMethodAsync(...);
});

Answer 2

MyAPI.handle(async () =>
{
    // my implementation
    await MyMethodAsync(...);
});

Answer 3

Another solution for people like me that don't really like how lambdas look.

MyAPI.handle(
    async delegate() {
        // my implementation
        await MyMethodAsync(...);
    }
);