Async Lambda Statements

This is a quick post showing how to use Lambda statements with async code. It’s simple once you know how, but can take few mins if you haven’t seen an example.

There’s not a lot too it, you add the async keyword and the return type if applicable to the left of the Lambda signature.

var add = async Task<int> (int a, int b) => 
{
    await Task.Delay(1000);
    return a + b;
};

var subtract = async Task (int a, int b) => 
{
    await Task.Delay(1000);
    Console.WriteLine($"a - b = {a - b}");
};

Console.WriteLine($"a + b = {await add(1, 2)}");
await subtract(1, 2);

That’s it, as I said, not a lot to it.