c# 接口IComparer<T>

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Sort()方法是集合中默认的排序方法，它的排序方式可以通过IComparable接口实现。

如果要指定排序方式可以实现IComparer接口的Compare(T x,T y)方法Sort(Icomparer)

降序，升序年龄比较器

class AgeDesc : IComparer<Student> {

#region IComparer<Student> 成员

        public int Compare(Student x, Student y)
        {
            return y.Age.CompareTo(x.Age);
        }

        #endregion
    }
    class AgeAsc : IComparer<Student> {

#region IComparer<Student> 成员

        public int Compare(Student x, Student y)
        {
            return x.Age.CompareTo(y.Age);
        }

#endregion
}

private void btnAgeDesc_Click(object sender, EventArgs e)
        {
            student.Sort(new AgeDesc());
            Print(student);
        }
        private void Print(List<Student> stu) {
            this.listView1.Items.Clear();
            foreach (Student st in stu) {
                ListViewItem lvi = new ListViewItem(st.Name);
                lvi.SubItems.AddRange(new string[] {st.Age.ToString()});
                listView1.Items.Add(lvi);

}
}

        private void btnAgeAsc_Click(object sender, EventArgs e)
        {
            student.Sort(new AgeAsc());
            Print(student);
        }

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