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

winform界面如下：

 1 using system;
 2 using system.collections.generic;
 3 using system.componentmodel;
 4 using system.data;
 5 using system.drawing;
 6 using system.linq;
 7 using system.text;
 8 using system.threading.tasks;
 9 using system.windows.forms;
10 
11 namespace form1
12 {
13     public partial class form1 : form
14     {
15         list<student> data = getstudents();
16         public form1()
17         {
18             initializecomponent();
19 
20             this.datagridview1.datasource = data;
21         }
22 
23 
24         public static list<student> getstudents()
25         {
26 
27             return new list<student>()
28             {
29                 new student{ id =1,name="小a",age=18},
30                 new student{ id =2,name="小b",age=18},
31                 new student{ id =3,name="小c",age=18},
32                 new student{ id =4,name="小d",age=18},
33                 new student{ id =5,name="小e",age=18},
34                 new student{ id =6,name="小f",age=18},
35                 new student{ id =7,name="小g",age=18},
36                 new student{ id =8,name="小k",age=18}
37 
38             };
39 
40         }
41         private void tsmdelete_click(object sender, eventargs e)
42         {
43 
44             list<student> students = new list<student>();
45             foreach (datagridviewrow row in this.datagridview1.selectedrows)
46             {
47                 var student = row.databounditem as student;
48                 if (student != null)
49                 {
50                      data.remove(student);
51                    // students.add(student);
52                 }
53             }
54            
55             for (int i = 0; i < students.count(); i++)
56             {
57                 data.remove(students[i]);
58             }
59             this.datagridview1.datasource = null;
60             this.datagridview1.datasource = data;
61         }
62     }
63 }

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。