如何在gridview中绑定下拉列表? [英] how to bind a dropdownlist in gridview?

问题描述

我有一个 gridview，其中每一行都包含一个下拉列表.我想动态绑定每个下拉列表.谁能告诉我我该怎么做.提前致谢

I have a gridview in which every row contains a dropdownlist. I want to bind every dropdownlist dynamically. Can someone tell me how can i do it. Thanks in Advance

推荐答案

如果您正在使用模板列，那么您可以使用数据绑定表达式从标记绑定下拉列表.例如，

If you are using template column then you can bind your drop-down from mark-up using data-binding expressions. For example,

<asp:TemplateField HeaderText="XYZ">
  <ItemTemplate>
    <asp:DropDownList runat="server" ID="MyDD" DataSourceId="MyDataSource" />
  </ItemTemplate> 
</asp:TemplateField>

以上假设您的下拉数据跨行保持不变.如果它正在更改，则可以使用数据绑定表达式，例如

Above is assuming that your drop-down data in constant across rows. If it is changing then you can use data-binding expression such as

<asp:DropDownList runat="server" DataSource='<%# GetDropDownData(Container) %>' DataTextField="Text" DataValueField="Value"  />

GetDropDownData 将是代码隐藏中的受保护方法，它将返回给定行的数据(数据表、列表、数组).

GetDropDownData will be a protected method in code-behind that will return the data (data-table, list, array) for the given row.

您可以使用 GridView.RowDataBound 事件(或 RowCreated 事件)在代码隐藏中填充下拉列表.例如，

You can use GridView.RowDataBound event (or RowCreated event) in code-behind to fill drop-downs. For example,

  protected void GridView_RowDataBound(Object sender, GridViewRowEventArgs e)
  {

    if(e.Row.RowType == DataControlRowType.DataRow)
    {
      // Find the drop-down (say in 3rd column)
      var dd = e.Row.Cells[2].Controls[0] as DropDownList;
      if (null != dd) {
         // bind it
      }

      /*
      // In case of template fields, use FindControl
      dd = e.Row.Cells[2].FindControl("MyDD") as DropDownList;
      */
    }

  }

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