.net 3.5里面的List<>的Exists是怎么使用的？

Question

如题，给出代码就结贴。

Answer 1

using System;
using System.Collections.Generic;public class Example
{
    public static void Main()
    {
        List<string> dinosaurs = new List<string>();        dinosaurs.Add("Compsognathus");
        dinosaurs.Add("Amargasaurus");
        dinosaurs.Add("Oviraptor");
        dinosaurs.Add("Velociraptor");
        dinosaurs.Add("Deinonychus");
        dinosaurs.Add("Dilophosaurus");
        dinosaurs.Add("Gallimimus");
        dinosaurs.Add("Triceratops");        Console.WriteLine();
        foreach(string dinosaur in dinosaurs)
        {
            Console.WriteLine(dinosaur);
        }        Console.WriteLine("\nTrueForAll(EndsWithSaurus): {0}",
            dinosaurs.TrueForAll(EndsWithSaurus));        Console.WriteLine("\nFind(EndsWithSaurus): {0}", 
            dinosaurs.Find(EndsWithSaurus));        Console.WriteLine("\nFindLast(EndsWithSaurus): {0}",
            dinosaurs.FindLast(EndsWithSaurus));        Console.WriteLine("\nFindAll(EndsWithSaurus):");
        List<string> sublist = dinosaurs.FindAll(EndsWithSaurus);        foreach(string dinosaur in sublist)
        {
            Console.WriteLine(dinosaur);
        }        Console.WriteLine(
            "\n{0} elements removed by RemoveAll(EndsWithSaurus).", 
            dinosaurs.RemoveAll(EndsWithSaurus));        Console.WriteLine("\nList now contains:");
        foreach(string dinosaur in dinosaurs)
        {
            Console.WriteLine(dinosaur);
        }        Console.WriteLine("\nExists(EndsWithSaurus): {0}", 
            dinosaurs.Exists(EndsWithSaurus));
    }    // Search predicate returns true if a string ends in "saurus".
    private static bool EndsWithSaurus(String s)
    {
        if ((s.Length > 5) && 
            (s.Substring(s.Length - 6).ToLower() == "saurus"))
        {
            return true;
        }
        else
        {
            return false;
        }
    }
}/* This code example produces the following output:Compsognathus
Amargasaurus
Oviraptor
Velociraptor
Deinonychus
Dilophosaurus
Gallimimus
TriceratopsTrueForAll(EndsWithSaurus): FalseFind(EndsWithSaurus): AmargasaurusFindLast(EndsWithSaurus): DilophosaurusFindAll(EndsWithSaurus):
Amargasaurus
Dilophosaurus2 elements removed by RemoveAll(EndsWithSaurus).List now contains:
Compsognathus
Oviraptor
Velociraptor
Deinonychus
Gallimimus
TriceratopsExists(EndsWithSaurus): False
 */