给easyui tree树加图标

TreeNode treeNode = new TreeNode
{
id =  this.MenuCode ,
text = this.MenuName,
//  state = this.state == true ?"open" :"closed"  ,//添用方法自动处理了
iconCls =this.IconClass,//添加图标
Checked = false,
attributes = new { Url = this.URL },
children = new List<TreeNode>()
};