TreeNode RenderPostText样式

Question

我正在扩展TreeNode并重写RenderPostText，我想在节点的末尾添加一个标签。 标签应移到右侧，并在另一个下方直线对齐。

这就是我现在所拥有的:(不是我想要的，标签不对齐）

protected override void RenderPostText(HtmlTextWriter writer)
{
   writer.AddStyleAttribute(HtmlTextWriterStyle.MarginLeft, "250px");
   writer.RenderBeginTag(HtmlTextWriterTag.Span);
   writer.Write("LABEL");
   writer.RenderEndTag();
   base.RenderPostText(writer);
}

浏览器生成以下代码：

<div id="CustomTreeView1">
    <table cellspacing="0" cellpadding="0" style="border-width:0;">
        <tbody><tr>
            <td><a href="javascript:TreeView_ToggleNode(CustomTreeView1_Data,0,document.getElementById('CustomTreeView1n0'),' ',document.getElementById('CustomTreeView1n0Nodes'))" id="CustomTreeView1n0"><img style="border-width:0;" alt="Collapse Node1" src="/WebResource.axd?d=0LdB1b1_hIJIUCl6sgbTDwZP1PqSlJ3nEAs9RyFhhbFOrEZWA69PFGUD8UnFd3CmlnXXDykXOkYb6vloumJmNTV3T2cN1sRb8dj_XP3B36tSwYv59yT2TFUDF1XMP3tC0&amp;t=634307713248437500"></a></td><td style="white-space:nowrap;"><input type="checkbox" id="CustomTreeView1n0CheckBox" name="CustomTreeView1n0CheckBox"><a id="CustomTreeView1t0" onclick="TreeView_SelectNode(CustomTreeView1_Data, this,'CustomTreeView1t0');" href="javascript:__doPostBack('CustomTreeView1','sNode1')" class="CustomTreeView1_0">Node1</a><span style="margin-left:250px;">LABEL</span></td>
        </tr>
    </tbody></table><div style="display:block;" id="CustomTreeView1n0Nodes">
        <table cellspacing="0" cellpadding="0" style="border-width:0;">
            <tbody><tr>
                <td><div style="width:20px;height:1px"></div></td><td><a href="javascript:TreeView_ToggleNode(CustomTreeView1_Data,1,document.getElementById('CustomTreeView1n1'),' ',document.getElementById('CustomTreeView1n1Nodes'))" id="CustomTreeView1n1"><img style="border-width:0;" alt="Collapse Node2" src="/WebResource.axd?d=0LdB1b1_hIJIUCl6sgbTDwZP1PqSlJ3nEAs9RyFhhbFOrEZWA69PFGUD8UnFd3CmlnXXDykXOkYb6vloumJmNTV3T2cN1sRb8dj_XP3B36tSwYv59yT2TFUDF1XMP3tC0&amp;t=634307713248437500"></a></td><td style="white-space:nowrap;"><input type="checkbox" id="CustomTreeView1n1CheckBox" name="CustomTreeView1n1CheckBox"><a id="CustomTreeView1t1" onclick="TreeView_SelectNode(CustomTreeView1_Data, this,'CustomTreeView1t1');" href="javascript:__doPostBack('CustomTreeView1','sNode1\\Node2')" class="CustomTreeView1_0">Node2</a><span style="margin-left:250px;">LABEL</span></td>
            </tr>
        </tbody></table><div style="display:block;" id="CustomTreeView1n1Nodes">
            <table cellspacing="0" cellpadding="0" style="border-width:0;">
                <tbody><tr>
                    <td><div style="width:20px;height:1px"></div></td><td><div style="width:20px;height:1px"></div></td><td><img alt="" src="/WebResource.axd?d=aAOD5g58ic2Dyy2j7ixwQreE7Dpb8bpKl_xmoKpMHe9oWkQKGRM7ihb90wYKM9JeccXzs42e-0b6vjGRgr4SVqUWclDUDk-H6Nircokjs_I3zT2h2LljOQCZRPfv3Vok0&amp;t=634307713248437500"></td><td style="white-space:nowrap;"><input type="checkbox" id="CustomTreeView1n2CheckBox" name="CustomTreeView1n2CheckBox"><a id="CustomTreeView1t2" onclick="TreeView_SelectNode(CustomTreeView1_Data, this,'CustomTreeView1t2');" href="javascript:__doPostBack('CustomTreeView1','sNode1\\Node2\\Node4')" class="CustomTreeView1_0">Node4</a><span style="margin-left:250px;">LABEL</span></td>
                </tr>
            </tbody></table>
        </div><table cellspacing="0" cellpadding="0" style="border-width:0;">
            <tbody><tr>
                <td><div style="width:20px;height:1px"></div></td><td><img alt="" src="/WebResource.axd?d=aAOD5g58ic2Dyy2j7ixwQreE7Dpb8bpKl_xmoKpMHe9oWkQKGRM7ihb90wYKM9JeccXzs42e-0b6vjGRgr4SVqUWclDUDk-H6Nircokjs_I3zT2h2LljOQCZRPfv3Vok0&amp;t=634307713248437500"></td><td style="white-space:nowrap;"><input type="checkbox" id="CustomTreeView1n3CheckBox" name="CustomTreeView1n3CheckBox"><a id="CustomTreeView1t3" onclick="TreeView_SelectNode(CustomTreeView1_Data, this,'CustomTreeView1t3');" href="javascript:__doPostBack('CustomTreeView1','sNode1\\Node3')" class="CustomTreeView1_0">Node3</a><span style="margin-left:250px;">LABEL</span></td>
            </tr>
        </tbody></table>
    </div>
</div>