lambda expression are often used with Func and Action delegates.
Func and Action are predefined delegates with generic parameters.
delegate TResult Func <out TResult> ();
delegate TResult Func <in T, out TResult> (T arg);
delegate TResult Func <in T1, in T2, out TResult> (T1 arg1, T2 arg2);
... and so on, up to T16
delegate void Action ();
delegate void Action <in T> (T arg);
delegate void Action <in T1, in T2> (T1 arg1, T2 arg2);
... and so on, up to T16
Here is an example of how use to use Func to create a lambda expression.
using System;
class Program
{
public static void Main()
{
Func<int, int> sqr = x => x * x;
Console.WriteLine(sqr(3));
}
}
The output:
9
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