在Asp.net中，将数据绑定到Listview的Header模板

Question

我想在页眉中显示一些细节，如名称和许可证号码，这是唯一且不会在特定的Listview中重复的。有没有办法显示这个？

- Hakoo Desai

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你从哪里获取这些数据的？这些属性是在 ListView 的数据源中呈现还是你想使用一些页面属性？ - Yuriy Rozhovetskiy

来自SqlDataSource。 - Hakoo Desai

Answer 1

您可以为要在布局中显示的数据引入页面属性，从ItemDataBound事件处理程序中获取第一行数据项，并在ListView的DataBound事件处理程序中绑定布局控件：

<asp:ListView ID="ListView1" runat="server" DataKeyNames="job_id" DataSourceID="SqlDataSource1">
          <LayoutTemplate>
               <table>
                    <thead>
                         <tr runat="server" id="headerRow">
                              <th>
                                   <%# FirstHeaderText %></th>
                              <th>
                                   <%# SecondHeaderText  %>
                              </th>
                         </tr>
                    </thead>
                    <tbody>
                         <tr runat="server" id="itemPlaceholder" />
                    </tbody>
               </table>
          </LayoutTemplate>
          <ItemTemplate>
               <tr>
                    <td>
                         <%# Eval("job_id")%></td>
                    <td>
                         <%# Eval("job_desc")%></td>
               </tr>
          </ItemTemplate>
     </asp:ListView>
     <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:PUBSConnectionString %>"
          SelectCommand="SELECT [job_id], [job_desc] FROM [jobs]"></asp:SqlDataSource>

服务器代码：

protected string FirstHeaderText
{
    get { return ViewState["FirstHeaderText"] as string; }
    set { ViewState["FirstHeaderText"] = value; }
}
protected string SecondHeaderText
{
    get { return ViewState["SecondHeaderText"] as string; }
    set { ViewState["SecondHeaderText"] = value; }
}

protected void Page_Init(object sender, EventArgs e)
{
    ListView1.ItemDataBound += new EventHandler<ListViewItemEventArgs>(ListView1_ItemDataBound);
    ListView1.DataBound += new EventHandler(ListView1_DataBound);
}

void ListView1_DataBound(object sender, EventArgs e)
{
    ((HtmlTableRow)ListView1.FindControl("headerRow")).DataBind();
}

void ListView1_ItemDataBound(object sender, ListViewItemEventArgs e)
{
    if (string.IsNullOrEmpty(FirstHeaderText) && e.Item.ItemType == ListViewItemType.DataItem)
    {
        var dataRow = e.Item.DataItem as DataRowView;
        FirstHeaderText = dataRow["job_id"].ToString();
        SecondHeaderText = dataRow["job_desc"].ToString();
    }
}

另一个可选方案是将标题部分放置在itemTemplate中，但仅对第一条记录进行显示。

<asp:ListView ID="ListView1" runat="server" DataKeyNames="job_id" DataSourceID="SqlDataSource1">
     <LayoutTemplate>
          <table>
               <asp:PlaceHolder runat="server" ID="itemPlaceholder" />
          </table>
     </LayoutTemplate>
     <ItemTemplate>
          <tr runat="server" visible='<%# (int)DataBinder.Eval(Container, "DataItemIndex") == 0 %>'>
               <th>
                    <%# Eval("job_id")%></th>
               <th>
                    <%# Eval("job_desc")%></th>
          </tr>
          <tr>
               <td>
                    <%# Eval("job_id")%></td>
               <td>
                    <%# Eval("job_desc")%></td>
          </tr>
     </ItemTemplate>
</asp:ListView>

- Yuriy Rozhovetskiy