/// 
    /// 根据DataTable生成Json树结构    /// 
    /// 数据源    /// ID列    /// Text列    /// 关系字段    /// 父ID    StringBuilder result = new StringBuilder();    StringBuilder sb = new StringBuilder();    private void GetTreeJsonByTable(DataTable tabel, string idCol, string txtCol, string rela, object pId)    {        result.Append(sb.ToString());        sb.Clear();        if (tabel.Rows.Count > 0)        {            sb.Append("[");            string filer = string.Format("{0}='{1}'", rela, pId);            DataRow[] rows = tabel.Select(filer);            if (rows.Length > 0)            {                foreach (DataRow row in rows)                {                    sb.Append("{\"id\":\"" + row[idCol] + "\",\"text\":\"" + row[txtCol] + "\",\"state\":\"open\"");                    if (tabel.Select(string.Format("{0}='{1}'", rela, row[idCol])).Length > 0)                    {                        sb.Append(",\"children\":");                        GetTreeJsonByTable(tabel, idCol, txtCol, rela, row[idCol]);                        result.Append(sb.ToString());                        sb.Clear();                    }                    result.Append(sb.ToString());                    sb.Clear();                    sb.Append("},");                }                sb = sb.Remove(sb.Length - 1, 1);            }            sb.Append("]");            result.Append(sb.ToString());            sb.Clear();        }    }

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