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));
//List<T>.Find()
//找出Name='puma'的Person
lstPerson.Find(delegate(Person p) { return p.Name == "puma"; });
//List<T>.FindAll()
//找出Age>10
lstPerson.FindAll(delegate(Person p) { return p.Age > 10; });
//List<T>.Exists()
//檢查Name='F6'是否存在
lstPerson.Exists(delegate(Person p) { return p.Name == "F6"; });
//List<T>.Sort()
//依Name升序排序
lstPerson.Sort(delegate(Person p1, Person p2) { return Comparer<string>.Default.Compare(p1.Name, p2.Name); });
//List<T>.Sort()
//依Name降序排序
lstPerson.Sort(delegate(Person p1, Person p2) { return Comparer<string>.Default.Compare(p2.Name, p1.Name); });
有一个list,格式如list<userType>, 但是这个userType并没有继承自ICompare或者IComparable 等,那如何给这个list排序那?
指定一个类 这个类要继承自ICompare<userType>
public class SortUserGroup:IComparer<UserGroup>
{
/// <summary>
/// Sort by AccountID and UserGroupName
/// </summary>
/// <param name="userGroup1"></param>
/// <param name="userGroup2"></param>
/// <returns></returns>
int IComparer<UserGroupEntityAccess>.Compare(UserGroup userGroup1, UserGroup userGroup2)
{
if (userGroup1 != null && userGroup2 != null)
{
if (userGroup1.AccountID == userGroup2.AccountID)
return userGroup1.UserGroupName.CompareTo(userGroup2.UserGroupName);
else
return userGroup1.AccountID > userGroup2.AccountID ? 1 : -1;
}
return -1;
}
}
然后:
SortUserGroup sortGroup = new SortUserGroup();
List<UserGroup>.Sort(sortUserGroup)
这里是按照UserGroup的AccountID 和 UserGroupName 两个字段排序。
详细的Sort用法