Predicate<(Of <(T>)>) 委托

public delegate bool Predicate<in T>(
T obj
)
此委托由 Array 和 List<(Of <(T>)>) 类的几种方法使用，用于在集合中搜索元素。

using System;
using System.Drawing;

public class Example
{
public static void Main()
{
// Create an array of five Point structures.
Point[] points = { new Point(100, 200),
new Point(150, 250), new Point(250, 375),
new Point(275, 395), new Point(295, 450) };

// To find the first Point structure for which X times Y
// is greater than 100000, pass the array and a delegate
// that represents the ProductGT10 method to the static
// Find method of the Array class.
Point first = Array.Find(points, ProductGT10);

// Note that you do not need to create the delegate
// explicitly, or to specify the type parameter of the
// generic method, because the C# compiler has enough
// context to determine that information for you.

// Display the first structure found.
Console.WriteLine("Found: X = {0}, Y = {1}", first.X, first.Y);
}

// This method implements the test condition for the Find
// method.
private static bool ProductGT10(Point p)
{
if (p.X * p.Y > 100000)
{
return true;
}
else
{
return false;
}
}
}

/* This code example produces the following output:

Found: X = 275, Y = 395
*/