Predicate

It is introduced in .Net 2.0.

A predicate delegate is a delegate with the following signature:

• Return type - bool
• Argument type - generic

Example : 

using System;

class Program
{
    static void Main()
    {
 //
 // This Predicate instance returns true if the argument is one.
 //
 Predicate isOne =
     x => x == 1;
 //
 // This Predicate returns true if the argument is greater than 4.
 //
 Predicate isGreaterEqualFive =
     (int x) => x >= 5;

 //
 // Test the Predicate instances with various parameters.
 //
 Console.WriteLine(isOne.Invoke(1));
 Console.WriteLine(isOne.Invoke(2));
 Console.WriteLine(isGreaterEqualFive.Invoke(3));
 Console.WriteLine(isGreaterEqualFive.Invoke(10));
    }
}

Output

True
False
False
True

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