C# List类常用操作之查找

  
//  
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//  作者：鸟哥
//  
//  email:xiaoniao2003@gmail.com
//
//
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization.Formatters;class Program
{class Student{internal string Name;internal int Age;internal Student(string n, int a){Name = n;Age = a;}public override string ToString(){return "name:"+Name+",age"+Age;}}static void Main(){List<Student> students = new List<Student>{new Student("aa",12),new Student("bb",14),new Student("ff",16),new Student("cc",12),new Student("ee",15),};//是否students中的所有对象的Age都大于10bool b=students.All(stu => stu.Age >10);Console.WriteLine("All:"+b);//是否students中有对象的Age都大于13b = students.Any(stu => stu.Age > 13);Console.WriteLine("Any:"+b);//列表中是否包含某个对象b=students.Contains(new Student("bb", 14));Console.WriteLine("Contains:"+b);b = students.Contains(students[1]);Console.WriteLine("Contains:" + b);//列表中是否存在Name 是 bb的对象b = students.Exists(stu => stu.Name == "bb");Console.WriteLine("Exists:" + b);//搜索Age为12的所有对象的第一个对象Student s=students.Find(stu => stu.Age == 12);Console.WriteLine("Find:" + s);//搜索Age为12的所有对象的最后一个对象s = students.FindLast(stu => stu.Age == 12);Console.WriteLine("FindLast:" + s);//搜索所有Name为bb 或Age为14的对象，以列表形式返回var r=students.FindAll(stu=>stu.Name=="bb"||stu.Age == 14);Console.WriteLine("FindAll:" + r.Count);//获取Name为bb 或Age为14的所有对象的第一个对象int index = students.FindIndex(stu => stu.Name == "bb" || stu.Age == 14);Console.WriteLine("FindIndex:" + index);index=students.IndexOf(students[1]);Console.WriteLine("IndexOf:" + index);}
}