Question

Assuming I have this function:

Func<string> fs = () => "test";
var st = fs();

I want to simplify this to:

var st = (()=> "test")();

It seems however that I can’t define the function and then instantly invoke it. Is this possible in another way?

This is possible:

var st = (new Func<string>(() => "test"))();

But very messy.

To clarify is it possible to define an anonymous function without have to specify the delegate type being used, i.e. is there a way to get the compiler to infer the types directly from the function?

Answer 1

You need to specify the type somehow. Others have shown how to do this inline.

There is another possibility: Create a helper method. Because the parameter of the method is defined, you don’t have to define the type yourself when calling the method.

static class Execute
{
    public static T Func<T>(Func<T> func)
    {
        return func();
    }
}

Usage:

var st = Execute.Func(() => "test");