C# 排序ICompare<>接口的使用

IComparer<T> 这是一个接口，是用来给对象中的某一个属性经行排序

class NameDESC:IComparer<StudentExt>
{
    public int Compare(StudentExt x,StudentExt y)
    {
          return y.StudentName.CompareTo(x.StudentName);
    }
}
//按照学号降序排列
class StudentIdDESC:ICompaner<StudentExt>
{
     public int Compare(StudentExt x,StudentExt y)
     {
          return y.StudentId.CompareTo(x.StudentId);  //因为是降序所以是y.CompareTo
    }
}
//点击插叙进行排序
private void btnStuIdDESC_Click(object sender,EventArgs e)
{
    this.list.Sort(new StudentIdDESC());
    this.dgvStudentList.DataSource=null;
    thid.dgvStudentList.DataSource=list;
}