Predicate

Based on: .NET 4.7 (2017)
C# program that uses Predicate type instances
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
In this example, the lambda expression syntax is used to specify the function body for the Predicates. The => syntax separates the arguments from the method bodies. The right-hand side is evaluated to a Boolean result.
In lambda expressions, the right-hand side of the expression acquires an implicit return value if this is indicated by the context. The Predicate type must always have a Boolean return value.
Note:
The two above lambdas return true if the argument is one, and if the argument is greater than four.
Finally:
The program executes the Invoke instance method on the Predicate types to demonstrate the functionality.
List. Predicate is often used with the List generic type. You can specify a lambda expression as the argument to certain List methods. The C# compiler then uses type inference to resolve the lambda expression to the correct Predicate type

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