List<student> pr = new List<student>();
pr.Add(new student { id=1,name="张三",sex="男",age=10});
pr.Add(new student { id = 1, name = "八七", sex = "男", age = 28 });
pr.Add(new student { id = 2, name = "赵六", sex = "女", age =16 });
pr.Add(new student { id = 3, name = "王五", sex = "男", age = 26 });
pr.Add(new student { id = 4, name = "张四", sex = "女", age = 17 });
List<student> hh = new List<student>();
for (int i = 0; i < pr.Count; i++)
{
if (pr[i].age > 20)
{
hh.Add(pr[i]);
}
}
for (int i = 0; i < hh.Count; i++)
{
Console.WriteLine(hh[i]);
}
}
}
}
public class student
{
public int id { get; set; }
public string name { get; set; }
public string sex { get; set; }
public int age { get; set; }
public override string ToString()
{
return string.Format("编号{0},姓名{1},性别{2},年龄{3}", this.id, this.name, this.sex, this.age);
}
}
}
2.
List<student> pr = new List<student>();
pr.Add(new student { id=1,name="张三",sex="女",age=18});
pr.Add(new student { id = 1, name = "八七", sex = "男", age = 28 });
pr.Add(new student { id = 2, name = "赵六", sex = "女", age = 16 });
pr.Add(new student { id = 3, name = "王五", sex = "男", age = 26 });
pr.Add(new student { id = 4, name = "张四", sex = "女", age = 17 });
List<student> hh = getset(pr);
for (int i = 0; i < hh.Count; i++)
{
Console.WriteLine(hh[i]);
}
}
public static List<student> getset(List<student> pr)
{
List<student> hh = new List<student>();
for (int i = 0; i < pr.Count; i++)
{
if (pr[i].age > 20)
{
hh.Add(pr[i]);
}
}return hh;
3.
List<Student> students = new List<Student>();
//Where ToList FirstOrDefault
students.Add(new Student { Id=1,Name="张三",Sex="男",Age=18});
students.Add(new Student { Id = 2, Name = "李四", Sex = "女", Age = 28 });
students.Add(new Student { Id = 3, Name = "王五", Sex = "男", Age = 16 });
students.Add(new Student { Id =4, Name = "赵六", Sex = "女", Age = 26 });
students.Add(new Student { Id = 5, Name = "田七", Sex = "男", Age = 27 });
List<Student> result = students.OrderByDescending(s => s.Id).ToList();
for (int i = 0; i < result.Count; i++)
{
Console.WriteLine(result[i]);
}
