C#_如何在List中搜索指定項

（1）使用.Contains方法

 

using System;
using System.Collections.Generic;

namespace csharptest_1
{
    class NewClass
    {
        private static List<string> list;
        private static void FindElementInList(string a) 
        {
            if (list.Contains(a)) 
            {
                Console.WriteLine("list包含" + a);
            }
        }

        public static void Main()
        {
            list = new List<string>();
            list.Add("Jax");
            list.Add("Lux");
            list.Add("Jinx");
            list.Add("Jayce");
            list.Add("Aatrox");
            list.Add("Xerath");

            FindElementInList("jax");
        }
    }
}

 

（2）使用.Find方法

using System;
using System.Collections.Generic;

public class Program
{
    private static List<string> list;
    public static string a = "";
    private static bool Findstring(string obj)
    {
        return obj == a;
    }
    public static void Main()
    {
        list = new List<string>();                       
        list.Add("Jim");
        list.Add("walter");
        list.Add("coco");
        list.Add("alex");
        list.Add("alex");
        list.Add("Jack");
        list.Add("Emma");

        Predicate<string> predicate = Findstring;
        a = "coco";
        int tem1 = list.FindLastIndex(predicate);//通過Predicate<T> Delegate
        int tem2 = list.FindLastIndex(x => x == "Jack");//通過lambda-expressions

        // Display the first structure found.
        Console.WriteLine("index=" + tem1);
        Console.WriteLine("index=" + tem2);
    }
}

Find系列有多個方法：Find/FindAll/FindIndex/FindLast/FindLastIndex