List Sort()、Find()、FindAll()、Exist() in c#

paulyu — Sun, 18 Apr 2010 18:51:01 +0000

How to write delegate for sort, find, findall and exist.

Response.Write("找出Name='puma'的Person→ ");
Response.Write(lstPerson.Find(delegate(Person p) { return p.Name == "puma"; }).ToString() + "");

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

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

Ref

Chuan-Yih, Yu » List()

List Sort()、Find()、FindAll()、Exist() in c#