展开/收缩 ul

了一个展开收缩的东东，留着以后万一用到

后台递归生成的函数（这里是一个反射参数展示，支持多层级展开显示，后台反射如何多层级解析的方法有时间再补上吧）

/// <summary>
/// 递归生成html展示request属性
/// </summary>
/// <param name="listProperties">request属性集合</param>
/// <returns>html</returns>
public static string OutputRequest(List<PropertyViewModel> listProperties)
{
const string contractImg = "<img src="../Cake/Easyui/themes/icons/edit_remove.png" width="16px" height="16px" border="0px" style="vertical-align: middle" />";
const string output = "<table><tbody>{0}</tbody></table>";
var html = new StringBuilder();
if (listProperties == null || listProperties.Count <= 0) return string.Empty;

foreach (var propertyOrField in listProperties)
{
var tr = new StringBuilder();
tr.AppendFormat("<tr>");
if (propertyOrField.Type.Properties != null && propertyOrField.Type.Properties.Count > 0)
tr.AppendFormat("<td class="onclick">{1}&nbsp;&nbsp;{0}</td>", propertyOrField.Name, contractImg);
else
tr.AppendFormat("<td>{0}</td>", propertyOrField.Name);
tr.AppendFormat("<td>[{0}]</td>", propertyOrField.Type.Name.EscapeSequence());//特殊字符转移 用于前端html展示
tr.AppendFormat("<td>{0}</td>", propertyOrField.Summary);
tr.AppendFormat("</tr>");
html.Append(tr);
if (propertyOrField.Type.Properties != null && propertyOrField.Type.Properties.Count > 0)
html.AppendFormat("<tr class="expand"><td style="padding-left:30px" colspan="3">{0}</td></tr>", OutputRequest(propertyOrField.Type.Properties));
}
return string.Format(output, html);
}