最近寫案子常常用到List<T>,這個東西還真好用

因為它有下列東西：

List<T>.Sort() → 排序T

List<T>.Find() → 找出一個T

List<T>.FindAll() →找出多個T

List<T>.Exist() →判斷T是否存在

小弟就寫個範例介紹這些東西吧..

List<Person> lstPerson = new List<Person>();
lstPerson.Add(new Person(1, "puma", 10));
lstPerson.Add(new Person(2, "F6 Team", 20));
lstPerson.Add(new Person(3, "ASP.NET", 30));
lstPerson.Add(new Person(4, "Dotblogs", 40));

//原始資料顯示在GridView上
this.GridView1.DataSource = lstPerson;
this.GridView1.DataBind();

//List<T>.Find()
//找出Name='puma'的Person
Response.Write("找出Name='puma'的Person→ ");
Response.Write(lstPerson.Find(delegate(Person p) { return p.Name == "puma"; }).ToString();

//List<T>.FindAll()
//找出Age>10的數目
Response.Write("找出Age>10的數目→ ");
Response.Write(lstPerson.FindAll(delegate(Person p) { return p.Age > 10; }).Count.ToString();

//List<T>.Exists()
//檢查Name='F6'是否存在
Response.Write("檢查Name='F6'是否存在→ ");
Response.Write(lstPerson.Exists(delegate(Person p) { return p.Name == "F6"; }).ToString();

//List<T>.Sort()
//依Name升冪排序
Response.Write("<p>依Name升冪排序↑<br/>");
lstPerson.Sort(delegate(Person p1, Person p2) { return Comparer<string>.Default.Compare(p1.Name, p2.Name); });
foreach (Person p in lstPerson)
   Response.Write(p.ToString() + "<br/>");

//List<T>.Sort()
//依Name降冪排序
Response.Write("<p>依Name降冪排序↓<br/>");
lstPerson.Sort(delegate(Person p1, Person p2) { return Comparer<string>.Default.Compare(p2.Name, p1.Name); });
foreach (Person p in lstPerson)
Response.Write(p.ToString() + "<br/>");

ublic class Person 

 
   private int _ID; 
   private string _Name; 
   private int _Age; 

   public Person(int ID, string Name, int Age) 
   { 
       _ID = ID; 
       _Name = Name; 
       _Age = Age; 
   } 

   public int ID 
   { 
       set { _ID = value; } 
       get { return _ID; } 
   } 

   public string Name 
   { 
       set { _Name = value; } 
       get { return _Name; } 
   } 

   public int Age 
   { 
       set { _Age = value; } 
       get { return _Age; } 
   } 

   public override string ToString() 
   { 
       return string.Format("ID：{0}，Name：{1}，Age：{2}", _ID, _Name, _Age); 
   } 
 

執行結果：