在网格视图中删除行

Question

    protected void grd_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
        SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["constr"].ToString());
        con.Open();
        string query = "delete from details where sno='"+grd.DataKeys[e.RowIndex].Value+"'";-----(getting error like Index was out of range. Must be non-negative and less than the size of the collection.Parameter name: index)
        SqlCommand cmd = new SqlCommand(query,con);
        cmd.ExecuteNonQuery();
        filldata();
        con.Close();  
     }

gettnig 错误，例如 Index 超出范围。必须是非负数且小于集合的大小

Answer 1

错误来自以下语句

grd.DataKeys[e.RowIndex]

并且表示e.RowIndex 的值超出了grd.DataKeys 数组的元素范围。

要进一步调试，您需要找出e.RowIndex 的值，并查看grd.DataKeys 数组中有多少元素。

Answer 2

您应该在 .aspx 页面中为 GridView 添加DataKeyNames="your_id_column" 属性

然后在grd_RowDeleting 方法中，您可以通过grd.DataKeys[e.RowIndex].Value 或grd.DataKeys[e.RowIndex].Values["your_id_column"] 访问它

另外最好将结果解析为字符串

Answer 3

{

      SqlConnection con=newSqlConnection(ConfigurationManager.ConnectionStrings["constr"].ToString());
      con.Open();
      int Sno = Convert.ToInt32(grd.DataKeys[e.RowIndex].Values[0].ToString());
      string query="delete from Details where Sno="+Sno;
      SqlCommand cmd = new SqlCommand(query, con);
      int result = cmd.ExecuteNonQuery();
      con.Close();

}