Define a lambda function and execute it immediately

Question

I\'m defining a lambda and calling it, by appending \"()\", immediately.

Try:

int i = (() => 0) ();

Error:

Er

Answer 1

A lambda just does not support being executed. A delegate supports being executed. A lambda expression can be implicitly converted to a delegate type. In case no such conversion is requested there is no "default" delegate type. Since .NET 2 we normally use Action and Func for everything but we could use different delegate types.

First convert to a delegate, then execute:

((Func)(() => 0))()

One could argue that C# should default to using Action and Func if nothing else was requested. The language does not do that as of C# 5.