GridView指定的参数已超出有效值的范围
GridView在更新过程中
异常详细信息: System.ArgumentOutOfRangeException: 指定的参数已超出有效值的范围。
参数名: index


本段代码如下

protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
  {
   
  string stuID = GridView1.DataKeys[e.RowIndex].Value.ToString();
   
  TextBox tb1 = (TextBox)GridView1.Rows[e.RowIndex].Cells[2].Controls[0];
  string g1 = tb1.Text;// 显示错误在这两行上

  string g2 = ((TextBox)GridView1.Rows[e.RowIndex].Cells[3].Controls[0]).Text;
  string g3 = ((TextBox)GridView1.Rows[e.RowIndex].Cells[4].Controls[0]).Text;
  string g4 = ((TextBox)GridView1.Rows[e.RowIndex].Cells[5].Controls[0]).Text;
  string updateSql = String.Format("update studentInfo set grade1='{0}',grade2='{1}',grade3='{2}',grade4='{3}' where stuID='{4}'",g1,g2,g3,g4,stuID);

  SqlConnection conn = new SqlConnection("server=.;database=Elect;Integrated Security=SSPI");
  conn.Open();
  SqlCommand cmd = new SqlCommand(updateSql, conn);
  int count=cmd.ExecuteNonQuery();
  conn.Close();
  if (count > 0)
  {
  Response.Write("<script>alert('更新成功！')</script>");
  }
  GridView1.EditIndex = -1;
  BindGrid();
  }

另：GridView总共是7列13排



------解决方案--------------------
TextBox tb1 = (TextBox)GridView1.Rows[e.RowIndex].Cells[2].Controls[0];
看看取的控件对不对？
------解决方案--------------------

探讨

TextBox tb1 = (TextBox)GridView1.Rows[e.RowIndex].Cells[2].Controls[0];
看看取的控件对不对？

------解决方案--------------------
GridView1.Rows[e.RowIndex].Cells[2].Controls[0]
先确认是否有controls，在确定controls[0]是否是textbox
------解决方案--------------------

探讨

试过了在后面加.ToString()转换格式，也还显示同样的错误