c# - 使用项目模板在值不为空时追加 tr

Question

我正在使用项目模板附加行

<tr>
    <td>
         <asp:HyperLink ID="HyperLink1" NavigateUrl="bla" CssClass="display:inherit !important;" Text='<%# someFunction(School.Name,"Name") %>' runat="server" />
    </td>
</tr>

上面的问题是如果 someFunction(School.Name,"Name") 返回 null 它附加空 tr，所以我只想在 someFunction(School.Name,"Name")!=null

时附加 tr

所以我通过添加 if 条件尝试了下面的代码，但它没有编译!!它说 school.name 未定义

<% if(someFunction(School.Name,"Name")!=null){
<tr>
    <td>
        <asp:HyperLink ID="HyperLink1" NavigateUrl="bla" CssClass="display:inherit !important;" Text='<%# someFunction(School.Name,"Name") %>' runat="server" />
    </td>
</tr>                       
 } %>

Answer 1

您可以从后面的代码中处理它。

<td id="tdAppend" runat="server"> Content </td>


if(School.Name == null)
    tdAppend.Visible = false;

更新的答案:

currentItemIndex = -1;
listView.ItemDataBound += listView_ItemDataBound;
CheckQueryString();

//Hide or show the table header based on id
HtmlControl thControl = listView.FindControl("thAppend") as HtmlControl;
if (thControl != null)
{
    if (obj.ID == 12)
    {
        thControl.Visible = true;

    }
    else
    {
        thControl.Visible = false;
        for (int i = 0; i < listView.Items.Count; i++)
        {
            HtmlControl tdControl = listView.Items[i].FindControl("tdSchoolName") as HtmlControl;
            if (tdControl != null)
            {
                tdControl.Visible = false;
            }
        }

    }
}

为方便起见:

void listView_ItemDataBound(object sender, ListViewItemEventArgs e)
{
    if (e.Item.ItemType == ListViewItemType.DataItem)
    {
        currentItemIndex++;

        ListViewDataItem dataitem = (ListViewDataItem)e.Item;

        HtmlTableRow trControl = (HtmlTableRow)e.Item.FindControl("MainTableRow");
        if (IsOdd(currentItemIndex))
            trControl.BgColor = "DarkGray";

    }
}

private bool IsOdd(int value)
{
    return value % 2 != 0;
}