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         }