将DataTable转成easyui-datagrid tree的JSON格式

        方法1

        /// <summary>
        /// 根据Datatable得到Tree结构的JSON数据（去掉前12个字符，不能包括""）
        /// </summary>
        /// <param name="dt"></param>
        /// <param name="pField"></param>
        /// <param name="pValue"></param>
        /// <param name="kField"></param>
        /// <param name="TextField"></param>
        /// <returns></returns>
        public static string TableToEasyUITreeJson(DataTable dt, string pField, string pValue, string kField, string TextField)
        {
            StringBuilder sb = new StringBuilder();
            string filter = String.Format(" {0}='{1}' ", pField, pValue);//获取顶级目录.
            DataRow[] drs = dt.Select(filter);
            if (drs.Length < 1)
                return "";
            sb.Append(","children":[");
            foreach (DataRow dr in drs)
            {
                string pcv = dr[kField].ToString();
                sb.Append("{");
                sb.AppendFormat(""ID":"{0}",", dr[kField].ToString().Replace(""", "\""));
                sb.AppendFormat(""text":"{0}"", dr[TextField].ToString().Replace(""", "\""));
                sb.Append(TableToEasyUITreeJson(dt, pField, pcv, kField, TextField).TrimEnd(','));
                sb.Append("},");
            }
            if (sb.ToString().EndsWith(","))
            {
                sb.Remove(sb.Length - 1, 1);
            }
            sb.Append("]");
            return sb.ToString();
        }

方法2：

private static string AddNode(string ParentID, int deep, DataSet ds)        

{            

string str = "";            

DataView dvTree = new DataView(ds.Tables[0]);

 dvTree.RowFilter = "[PID]   ='" + ParentID + "'";//过滤出ParentId                      

int i = 0;            

int d = deep;            

foreach (DataRowView drv in dvTree)            

       {

                if (i == 0)//如果是某一层的开始，需要“[”开始                 

                  {                    

                    if (d == 1)//如果深度为1,即第一层                         

                    str = "[";                    

                   else//否则，为第二层或更深                         

                    str = ","children":[";                

                    }

                else

                    str = str + ",";                

                    str = str + "{";

                str = str + ""ID":"" + drv["ID"] + "",";

                str = str + ""text":"" + drv["Name"] + """;

                str = str + AddNode(drv["ID"].ToString(), deep + 1, ds);//递归

                str = str + "}";

                i = i + 1;

                if (dvTree.Count == i)//如果某一层到了末尾,需要"]"结束

                      str = str + "]";

            }

            return str;

}