c# - Repeater ItemDataBound 事件给出空异常

Question

我在使用 itemdatabound 时遇到 null 异常。当我检查时，我看到的是项目索引为零。你能告诉我我的转发器哪里错了吗

我的中继器;

        <asp:Repeater runat="server" ID="rptKonutm" OnItemDataBound="rptKonut_ItemDataBound">
            <ItemTemplate>


      <div class="caption">
      <h4 class="pull-right"><%# DataBinder.Eval(Container.DataItem, "Fiyat") %>$</h4>
       <h4>
       <asp:Label runat="server" ID="lblKonutFiyat"></asp:Label>

        </h4>
        <h4 class="pull-right"><%# DataBinder.Eval(Container.DataItem, "Il")%></h4>
        <h4><asp:Label runat="server" ID="lblMevki"></asp:Label></h4>

          <h4 class="pull-right"><%# DataBinder.Eval(Container.DataItem, "EkBilgi")%></h4>
        <h4><asp:Label runat="server" ID="lblDahaFazlaBilgi"></asp:Label></h4>
        <h4 class="pull-right"><%# DataBinder.Eval(Container.DataItem, "AlanMetreKare")%></h4>
          <h4><asp:Label runat="server" ID="lblAlanMetreKare"></asp:Label></h4>
 </div>
                    <!-- Split button -->
                   </ItemTemplate>
        </asp:Repeater>

和 ItemDatabound 事件背后的代码

protected void rptKonut_ItemDataBound(object sender, RepeaterItemEventArgs e)
        {
            System.Web.UI.WebControls.Label lblKonutFiyat = (System.Web.UI.WebControls.Label)e.Item.FindControl("lblKonutFiyat");
            System.Web.UI.WebControls.Label lblMevki = (System.Web.UI.WebControls.Label)e.Item.FindControl("lblMevki");
            System.Web.UI.WebControls.Label lblDahaFazlaBilgi = (System.Web.UI.WebControls.Label)e.Item.FindControl("lblDahaFazlaBilgi");
            System.Web.UI.WebControls.Label lblAlanMetreKare = (System.Web.UI.WebControls.Label)e.Item.FindControl("lblAlanMetreKare");


            lblKonutFiyat.Text = MyResource.lblKonutFiyat;
            lblMevki.Text = MyResource.lblMevki;
            lblDahaFazlaBilgi.Text = MyResource.lblDahaFazlaBilgi;
            lblAlanMetreKare.Text = MyResource.lblAlanMetreKare;


        }

Answer 1

Imad 是正确的，您需要检查您是否在项目行中搜索。

您可以通过以下方式找到您的控件以确定错误原因:

        Label lblKonutFiyat = e.Item.FindControl("lblKonutFiyat") as Label;

        if (lblKonutFiyat != null)
        {
            lblKonutFiyat.Text = MyResource.lblKonutFiyat;
        }

       ....

如果您的控件为 null，它将优雅地处理它，任何未设置的标签都会为您提供有问题的标签。