winform删除dataGridView列报异常：System.IndexOutOfRangeException:“索引 7 没有值

winform界面如下：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace form1
{
    public partial class Form1 : Form
    {
        List<Student> data = GetStudents();
        public Form1()
        {
            InitializeComponent();

            this.dataGridView1.DataSource = data;
        }


        public static List<Student> GetStudents()
        {

            return new List<Student>()
            {
                new Student{ ID =1,Name="小a",Age=18},
                new Student{ ID =2,Name="小b",Age=18},
                new Student{ ID =3,Name="小c",Age=18},
                new Student{ ID =4,Name="小d",Age=18},
                new Student{ ID =5,Name="小e",Age=18},
                new Student{ ID =6,Name="小f",Age=18},
                new Student{ ID =7,Name="小g",Age=18},
                new Student{ ID =8,Name="小k",Age=18}

            };

        }
        private void tsmDelete_Click(object sender, EventArgs e)
        {

            List<Student> students = new List<Student>();
            foreach (DataGridViewRow row in this.dataGridView1.SelectedRows)
            {
                var student = row.DataBoundItem as Student;
                if (student != null)
                {
                     data.Remove(student);
                   // students.Add(student);
                }
            }
           
            for (int i = 0; i < students.Count(); i++)
            {
                data.Remove(students[i]);
            }
            this.dataGridView1.DataSource = null;
            this.dataGridView1.DataSource = data;
        }
    }
}

问题说明：右键删除行的时候异常，System.IndexOutOfRangeException:“索引 7 没有值。

删除的代码如下：

 private void tsmDelete_Click(object sender, EventArgs e)
        {
          
            foreach (DataGridViewRow row in this.dataGridView1.SelectedRows)
            {
                var student = row.DataBoundItem as Student;
                if (student != null)
                {
                     data.Remove(student);    
                }
            }
            this.dataGridView1.DataSource = null;
            this.dataGridView1.DataSource = data;
        }

修改后的代码：

        private void tsmDelete_Click(object sender, EventArgs e)
        {

            List<Student> students = new List<Student>();
            foreach (DataGridViewRow row in this.dataGridView1.SelectedRows)
            {
                var student = row.DataBoundItem as Student;
                if (student != null)
                {                   
                students.Add(student);
                }
            }

            for (int i = 0; i < students.Count(); i++)
            {
                data.Remove(students[i]);
            }
            this.dataGridView1.DataSource = null;
            this.dataGridView1.DataSource = data;
        }

异常的原因分析：

 this.dataGridView1.SelectedRows获取选中的行，假设删除的是第7行和第8行。

遍历去取删除这两行，类型DataGridViewRow 直接引用数据源中的值。第7行删除以后总行数就变成了7行 row.DataBoundItem去根据索引取第8行的值就超出了索引。