Question

我在页面上有一个DetailsView，其中包含很少的标签，我想在pageload事件上的那些标签中添加一些值..但是iam无法为这里的标签指定值是我的代码

iam尝试OnPreRender（）和OnDataBound（）事件但是我得到了nullpointer异常..

有人帮我这个......挣扎了好几天

 <asp:DetailsView ID="gv_wifisummery" runat="server" Width="550px"  
        AutoGenerateRows="true" ForeColor="#333333" CellPadding="3" 
        CellSpacing="3" OnPreRender="DetailsView2_DataBound" OnDataBound="check" >

        <Fields>
         <asp:TemplateField HeaderText="Devices ">

             <ItemTemplate>
                 <asp:Label ID="lbldevices" runat="server" Text='devices'></asp:Label>
             </ItemTemplate>
         </asp:TemplateField>
          <asp:CommandField ShowEditButton="True" />
        </Fields>

        <AlternatingRowStyle BackColor="White" Height="30px"/>
        <CommandRowStyle BackColor="White" Font-Bold="True" ForeColor="Blue" />
        <FieldHeaderStyle Font-Bold="True" Width="150px" />                                  
        <FooterStyle Font-Bold="True" ForeColor="White" />
        <PagerStyle BackColor="#666666" ForeColor="White" HorizontalAlign="Center" />
        <RowStyle BackColor="#E3EAEB" Font-Size="12px" />
    </asp:DetailsView>

- ============================================== ==============================================

protected void DetailsView2_DataBound(object sender, EventArgs e)
   {
    DetailsView myDetailsView = (DetailsView)sender;
    myDetailsView.ChangeMode(DetailsViewMode.Insert);
  //Insert
   if (myDetailsView.CurrentMode == DetailsViewMode.Insert)
  {
   ((Label)myDetailsView.FindControl("lbldevices")).Text =    DateTime.Now.ToString("M/d/yyyy HH:mm");
  }
 }




protected void check(object sender, EventArgs e)
{
DetailsView myDetailsView = (DetailsView)sender;

if (myDetailsView.CurrentMode == DetailsViewMode.Insert)
{
   // ((Label)myDetailsView.FindControl("lbldevices")).Text =   DateTime.Now.ToString("M/d/yyyy HH:mm");

 }

  ((Label)myDetailsView.FindControl("lbldevices")).Text = DateTime.Now.ToString("M/d/yyyy HH:mm");
}

Answer 1

首先检查mydetailsViews.Rows.Count（）＆gt; 0。我认为你的detailview没有行，这就是为什么它会抛出错误。

试试这个......

        DataTable table = new DataTable();
        table.Columns.Add("Devices");

        DataRow dr = table.NewRow();

        dr["Devices"] = DateTime.Now.ToString("M/d/yyyy HH:mm");
        table.Rows.Add(dr);
        myDetailsView.DataSource = table;
        myDetailsView.DataBind();

如何为页面加载事件的detailsview中的标签添加值

1 个答案: