Question

我有一个gridview和其中一行的下拉列表，我能够成功从数据库中检索值，但是当更改和更新时，我无法更新下拉值。

我的C＃文件是：

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        if ((e.Row.RowState & DataControlRowState.Edit) > 0)
        {
            DropDownList ddList = (DropDownList)e.Row.FindControl("ddlstatus");

            DataRowView dr = e.Row.DataItem as DataRowView;
            ddList.SelectedItem.Text = dr["status"].ToString();
            ddList.SelectedValue = dr["status"].ToString();
            // Response.Write("the selected value is"+ddList.SelectedValue);
            val = e.Row.Cells[1].Text.ToString();
            int id = int.Parse(val);
            //Response.Write(val);
            string ConnectionString = ConfigurationManager.ConnectionStrings["ConnectionStringName"].ConnectionString;
            using (SqlConnection con = new SqlConnection(ConnectionString))
            {
                using (SqlCommand cmd = new SqlCommand("UPDATE driver SET status = @status WHERE driverid = @driverid"))
                {
                    cmd.Connection = con;
                    cmd.Parameters.AddWithValue("@status", ddList.SelectedValue);
                    cmd.Parameters.AddWithValue("@driverid", id);

                    con.Open();
                    cmd.ExecuteNonQuery();
                }
            }
        }
    }
}

请帮助/指导，谢谢

Answer 1

我找到了解决方案，这是代码：

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {

        DropDownList ddlCurrentDropDownList = (DropDownList)sender;
        GridViewRow grdrDropDownRow = ((GridViewRow)ddlCurrentDropDownList.Parent.Parent);
        DropDownList ddList = (DropDownList)grdrDropDownRow.FindControl("ddlstatus");
        statusval = ddList.SelectedValue.ToString();
        Session[statusval] = statusval;    
    }
  protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {

        GridViewRow row = (GridViewRow)GridView1.Rows[e.RowIndex];
        string rname = (string)row.Cells[1].Text;


        string ConnectionStringn = ConfigurationManager.ConnectionStrings["ConnectionStringName"].ConnectionString;
        using (SqlConnection con = new SqlConnection(ConnectionStringn))
        {
            using (SqlCommand cmd = new SqlCommand("UPDATE driver SET status=@status WHERE driverid=@driverid"))
            {
                cmd.Connection = con;
                cmd.Parameters.AddWithValue("@status",statusval);
                cmd.Parameters.AddWithValue("@driverid",rname);

                con.Open();
                cmd.ExecuteNonQuery();
            }
        }
    }

更新gridview中的下拉列表无效，数据库中的值未更新

1 个答案: