如何绑定一个下拉列表在gridview？ [英] how to bind a dropdownlist in gridview?

问题描述

我有一个gridview，其中每行都包含一个下拉列表。我想动态绑定每个下拉列表。有人可以告诉我我该怎么办感谢提前

解决方案

如果您使用模板列，那么您可以使用数据绑定从标记绑定下拉列表表达式。例如，

 < asp：TemplateField HeaderText =XYZ> 
< ItemTemplate> 
< asp：DropDownList runat =serverID =MyDDDataSourceId =MyDataSource/> 
< / ItemTemplate> 
< / asp：TemplateField> 
  

以上假设您的下拉列表数据在不同行中。如果它正在改变，那么你可以使用数据绑定表达式，如

 < asp：DropDownList runat =serverDataSource = '<％＃GetDropDownData（Container）％>'DataTextField =TextDataValueField =Value/> 
  

GetDropDownData将是代码隐藏中的一个受保护方法，它将返回数据（数据表，列表，数组）。

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

  protected void GridView_RowDataBound（Object sender，GridViewRowEventArgs e）
 {
 
 if（e.Row.RowType == DataControlRowType.DataRow）
 {
 //找到下拉列表（在第3列中说）
 var dd = e.Row.Cells [2] .Controls [0]作为DropDownList; 
 if（null！= dd）{
 // bind it 
} 
 
 / * 
 //如果是模板字段，请使用FindControl 
 dd = e.Row.Cells [2] .FindControl（MyDD）作为DropDownList; 
 * / 
} 
 
} 
  

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

解决方案

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>

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

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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