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

how to bind ASP.Net DropDownList control in EditItemTemplate of GridView on edit(imagebutton)click

提问by Silver

I have requirement to bind ASP.Net DropDownList control in EditItemTemplate of GridView. I have a edit imagebutton with commandname="Edit"also dropdown needs to be binded from different table(directory) and not the table through which grid is binded(details).

我需要在 GridView 的 EditItemTemplate 中绑定 ASP.Net DropDownList 控件。我有一个带有 commandname="Edit" 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();
 }

the page is running but when i click edit image button the dropdwn shows but no data in dropdown binded it is empty. My gridview is inside update panel. How can i achieve this? Should dropdownlist in my case be binded inside rowcommand but how?

该页面正在运行，但是当我单击编辑图像按钮时，dropdwn 显示但下拉列表中没有绑定数据，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 内，但如何绑定？

采纳答案by Satinder singh

Code:Try this

代码：试试这个

protected void gv_RowDataBound(object sender, GridViewEditEventArgs e)
    {
     if (e.Row.RowType == DataControlRowType.DataRow)
      {
            if ((e.Row.RowState & DataControlRowState.Edit) > 0)
            {
              DropDownList ddList= (DropDownList)e.Row.FindControl("DStatusEdit");
              //bind dropdownlist
              DataTable dt = con.GetData("select distinct status from directory");
              ddList.DataSource = dt;
              ddList.DataTextField = "YourCOLName";
              ddList.DataValueField = "YourCOLName";
              ddList.DataBind();

              DataRowView dr = e.Row.DataItem as DataRowView;
              //ddList.SelectedItem.Text = dr["YourCOLName"].ToString();
              ddList.SelectedValue = dr["YourCOLName"].ToString();
            }
       }
    }

Have already answer similar question Binding dropdownlist inside gridview edititemtemplate

已经回答了类似问题Binding dropdownlist inside gridview edititemtemplate

View Blog Article : How to bind drop-down list inside gridview edit template

查看博客文章：如何在gridview编辑模板中绑定下拉列表

回答by Sasidharan

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
    }

回答by Sasidharan

Your forgot to bind the dropdown list

你忘了绑定下拉列表

DStatusEdit.DataBind();

回答by arun

I think this is helpful

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"));
}

回答by Tech knowledge

protected void GridView2_RowDataBound(object sender, GridViewRowEventArgs e) {

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();
        }
    }

}