c# - 如何在编辑（图像按钮）单击时在 GridView 的 EditItemTemplate 中绑定 ASP.Net DropDownList 控件

Question

我需要在 GridView 的 EditItemTemplate 中绑定 ASP.Net DropDownList 控件。我有一个带有命令名=“编辑”的编辑图像按钮，还需要从不同的表（目录）绑定下拉列表，而不是绑定网格的表（详细信息）。

if (e.Row.RowType == DataControlRowType.DataRow && (e.Row.RowState & DataControlRowState.Edit) == DataControlRowState.Edit && GridView1.EditIndex == e.Row.RowIndex)
 {
    DropDownList DStatusEdit = (DropDownList)e.Row.FindControl("DStatusEdit");
    string query = "select distinct status from directory";
    SqlCommand cmd = new SqlCommand(query);
    DStatusEdit.DataSource = GetData(cmd);
    DStatusEdit.DataTextField = "status";
    DStatusEdit.DataValueField = "status"; DStatusEdit.DataBind();     
    DataStatusEdit.DataBind();
 }

该页面正在运行，但是当我单击编辑图像按钮时，下拉菜单显示但下拉列表中没有数据绑定它是空的。我的 gridview 在更新面板内。我怎样才能做到这一点？在我的情况下，下拉列表应该绑定在 rowcommand 中，但如何绑定？

Answer 1

protected void gv_RowDataBound(object sender, GridViewEditEventArgs e)
{
   if (e.Row.RowType == DataControlRowType.DataRow)
      {
            if ((e.Row.RowState & DataControlRowState.Edit) > 0)
            {
              DropDownList DStatusEdit= (DropDownList)e.Row.FindControl("DStatusEdit");
              DataTable dt = con.GetData("select distinct status from directory");
              DStatusEdit.DataSource = dt;
              DStatusEdit.DataTextField = "status";
              DStatusEdit.DataValueField = "status";
              DStatusEdit.DataBind();
              DataRowView dr = e.Row.DataItem as DataRowView;
              DStatusEdit.SelectedValue = dr["columnname"].ToString();
            }
       }
    }
 }

    protected void gv_RowEditing(object sender, GridViewEditEventArgs e)
    {
      gv.EditIndex = e.NewEditIndex;
      gridviewBind();// your gridview binding function
    }

Answer 2

您忘记绑定下拉列表

DStatusEdit.DataBind();

Answer 3

我认为这很有帮助

private void bind_gridview_with_dropdownlist()
{

    DataSet ds = edtcoursedal.Loaddropdown();

    foreach (GridViewRow grdRow in GridView1.Rows)
    {
 DropDownList bind_dropdownlist = (DropDownList)(GridView1.FooterRow.Cells[3].FindControl("drplmaincourse"));
            bind_dropdownlist.DataSource = ds;
            bind_dropdownlist.DataTextField = "C_name";
            bind_dropdownlist.DataValueField = "MId";
            bind_dropdownlist.DataBind();
        }

    bind_dropdownlist.Items.Insert(0,new ListItem("Select","0"));
}

Answer 4

受保护的无效GridView2_RowDataBound（对象发送者，GridViewRowEventArgs e）{

    using (SqlConnection con = new SqlConnection(ConnectionString))
    {
        using (SqlCommand cmd = new SqlCommand("SELECT GatePassNo,PurposeOfVisit FROM VisitorList"))
        {
            cmd.CommandType = CommandType.Text;
            cmd.Connection = con;
            con.Open();
            DropDownList ddlpurposeofvisit = (DropDownList)e.Row.FindControl("ddlpurposeofvisit");
            ddlpurposeofvisit.DataSource = cmd.ExecuteReader();
            ddlpurposeofvisit.DataTextField = "PurposeOfVisit";
            ddlpurposeofvisit.DataValueField = "GatePassNo";
            ddlpurposeofvisit.DataBind();
            con.Close();
        }
    }

}