将树形结构生成Json字符串

 1 /// <summary>

 2         /// 将树形结构生成Json字符串

 3         /// </summary>

 4         /// <param name="dt">传入的树形结构DataTable</param>

 5         /// <param name="childColumnName">子级ID列名</param>

 6         /// <param name="parentColumnName">父级ID列名</param>

 7         /// <param name="textColumnName">内容列列名</param>

 8         /// <param name="Id">指定的需要进行查询的顶级节点的ID</param>

 9         /// <returns>此方法的返回会在前方多出",children:"这样10个长度的字符串，使用时去掉即可</returns>

10         public static string GetTreeJson(DataTable dt, string childColumnName, string parentColumnName, string textColumnName, int Id)

11         {

12             StringBuilder sb = new StringBuilder();

13             DataRow[] drs = dt.Select(parentColumnName + "=" + Id);

14             if (drs.Length < 1)

15                 return "";

16             sb.Append(",children:[");

17             foreach (DataRow dr in drs)

18             {

19                 sb.Append("{");

20                 sb.AppendFormat("id:{0},", dr[childColumnName].ToString());

21                 sb.AppendFormat("text:'{0}'", dr[textColumnName].ToString());

22                 sb.Append(GetTreeJson(dt, childColumnName, parentColumnName, textColumnName, (int)dr[childColumnName]).TrimEnd(','));

23                 sb.Append("},");

24             }

25             if (sb.ToString().EndsWith(","))

26             {

27                 sb.Remove(sb.Length - 1, 1);

28             }

29             sb.Append("]");

30             return sb.ToString();

31         }

使用时str = str.Substring(10); 去掉前10个长度的字符串