GridView asp.net 中的 DropDownList [英] DropDownList in GridView asp.net

问题描述

我想为 gridview 中的每个条目添加一个下拉列表.

I want to add a dropdownlist to every entry in a gridview.

    <asp:GridView ID="GridView1" runat="server"
    AutoGenerateColumns="False" 
        onselectedindexchanged="GridView1_SelectedIndexChanged">

        <Columns>                
          <asp:TemplateField HeaderText="Bank">
            <ItemTemplate>
              <asp:DropDownList ID="DropDown"
                AutoPostBack="true" runat="server"  DataTextField="Name" DataValueField="Name" 
              >
              </asp:DropDownList>
                </ItemTemplate>
            </asp:TemplateField>

        </Columns>
    </asp:GridView>

在后端，我使用以下代码将数据表绑定到该下拉列表.

At the back end i have the following code in order to bind a datatable to that dropdown list.

DataTable reader = BusinessLayer.BusinessLayerHandler.GetBankList();
DropDown.DataSource = reader;
DropDown.DataTextField = "NAME";
DropDown.DataValueField = "NAME";
DropDown.DataBind();

我的问题是在网格视图(DropDown)中创建的下拉列表在后端找不到，好像它不存在..

My problem is that the drop down list created at the grid view (DropDown) is not found at the back end as if it doesn't exist..

我能做什么?

推荐答案

DropDownList 将为 GridView 中的每一个项目创建，因此可以't 是下拉列表的一个字段.不过，您可以检索单行的 DropDownList(例如，在 RowDataBound 或 RowCreated 事件中)

The DropDownList will be created for every single item in the GridView, so there can't be one field for the dropdownlists. Nevertheless, you can retrieve the DropDownList for a single row (e.g. in RowDataBound or RowCreated event)

protected void grid_RowDataBound(object sender, GridViewRowEventArgs e)
{ 
  if(r.Row.RowType == DataControlRowType.DataRow)
  {
    DropDownList dropdown = e.Row.FindControl("DropDown") as DropDownList;
    if(dropdown != null)
    { /*  your code */ }
  }
}

或者您可以使用 DropDownList 本身的事件并访问 sender 参数.

Or you can use an event of the DropDownList itself and access the sender parameter.

<asp:DropDownList ID="DropDown" OnLoad="dropdownLoad" />

protected void dropdownLoad(object sender, EventArgs e)
{ 
  DropDownList dropdown = sender as DropDownList;
  if(dropdown != null)
  { /*  your code */ }
}

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