获取json串，根据datatable

 1  /// <summary>
 2         /// 获取json串，根据datatable
 3         /// </summary>
 4         /// <param name="dt"></param>
 5         /// <returns></returns>
 6         public static String GetJsonByTable(DataTable dt)
 7         {
 8             String rtn = String.Empty;
 9             String data = String.Empty;
10
11             rtn += "[";
12             foreach (DataRow dr in dt.Rows)
13             {
14                 data = "{";
15                 foreach (DataColumn dc in dt.Columns)
16                 {
17                     if (dt.Columns.IndexOf(dc) != dt.Columns.Count - 1)
18                     {
19                         data += "\"" + dc.ColumnName + "\":\"" + dr[dc].ToString() + "\",";
20                     }
21                     else
22                     {
23                         data += "\"" + dc.ColumnName + "\":\"" + dr[dc].ToString() + "\"";
24                     }
25                 }
26                 if (dt.Rows.IndexOf(dr) != dt.Rows.Count - 1)
27                 {
28                     data += "},";
29                 }
30                 else
31                 {
32                     data += "}";
33                 }
34                 rtn += data;
35             }
36
37             rtn += "]";
38
39             return rtn;
40         }