返回JSON最大的节点数

[上海_童鞋]

返回JSON中最大节点数。以下是我使用的方法，但返回值是错误的，请帮忙修改。或者使用其它的方法也行。

/// <summary>
    /// 表头类
    /// </summary>
    public class HeaderClass
    {
        /// <summary>
        /// 表头名称
        /// </summary>
        public string fieldtext { get; set; }
        /// <summary>
        /// 表头对应数据库列
        /// </summary>
        public string fieldname { get; set; }
        public List<HeaderClass> items { get; set; }
    }

private Int32 RowsCount = 1;
        public Int32 MaxRowsCount(List<HeaderClass> header)
        {
            int len = 1;
            foreach (HeaderClass _item in header)
            {
                if (_item.items != null)
                {
                    len = len + MaxRowsCount(_item.items);
                }
                if (RowsCount < len)
                { RowsCount = len; len = 0; }
            }
            return RowsCount;
        }

[
{fieldtext:\"列1\",fieldname:\"name\",colspan:2,rowspan:null,items:null},
{fieldtext:\"列1\",fieldname:\"name\",colspan:2,rowspan:null,items:[
{fieldtext:\"列1\",fieldname:\"name\",colspan:2,rowspan:null,items:[
{fieldtext:\"列1\",fieldname:\"name\",colspan:2,rowspan:null,items:[
{fieldtext:\"列1\",fieldname:\"name\",colspan:2,rowspan:null,items:[
{fieldtext:\"列1\",fieldname:\"name\",colspan:2,rowspan:null,items:null}
]}
]}
]},
{fieldtext:\"列1\",fieldname:\"name\",colspan:2,rowspan:null,items:[
{fieldtext:\"列1\",fieldname:\"name\",colspan:2,rowspan:null,items:[
{fieldtext:\"列1\",fieldname:\"name\",colspan:2,rowspan:null,items:[
{fieldtext:\"列1\",fieldname:\"name\",colspan:2,rowspan:null,items:[
{fieldtext:\"列1\",fieldname:\"name\",colspan:2,rowspan:null,items:[
{fieldtext:\"列1\",fieldname:\"name\",colspan:2,rowspan:null,items:null}
]}
]}
]}
]},
{fieldtext:\"列1\",fieldname:\"name\",colspan:2,rowspan:null,items:null}
]}
]},
{fieldtext:\"列1\",fieldname:\"name\",colspan:2,rowspan:null,items:null}
]