DropDownList的GridView控件在asp.net [英] DropDownList in GridView asp.net

问题描述

我要添加一个DropDownList在GridView的每个条目。

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>

在后端我有以下code，以绑定一个DataTable到下拉列表中。

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();

我的问题是下拉在网格视图（下拉）创建的列表不是在后端发现，如果它不存在，..

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..

我该怎么办？

推荐答案

的的DropDownList 将为每一个项目在创建的GridView ，所以不能的是为dropdownlists一个字段。不过，你可以检索单行DropDownList的（例如，在的RowDataBound 或 RowCreated 事件）

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 */ }
  }
}

或者你可以使用的事件的的DropDownList 本身并访问发件人参数。

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

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

这篇关于DropDownList的GridView控件在asp.net的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！