DataTable转JSON

 1  /// <summary>
 2         /// 将DataTable转为Json字符串
 3         /// </summary>
 4         /// <param name="dt"></param>
 5         /// <returns></returns>
 6         public static string DataTable2Json(DataTable dt)
 7         {
 8 
 9             if (dt.Rows.Count == 0)
10             {
11                 return "";
12             }
13 
14             StringBuilder jsonBuilder = new StringBuilder();
15             // jsonBuilder.Append("{");  
16             //jsonBuilder.Append(dt.TableName.ToString());   
17             jsonBuilder.Append("[");//转换成多个model的形式 
18             for (int i = 0; i < dt.Rows.Count; i++)
19             {
20                 jsonBuilder.Append("{");
21                 for (int j = 0; j < dt.Columns.Count; j++)
22                 {
23                     //保留两位
24                     if (dt.Columns[j].DataType.ToString() == "System.Decimal")
25                     {
26 
27                         jsonBuilder.Append("\"");
28                         jsonBuilder.Append(dt.Columns[j].ColumnName);
29                         jsonBuilder.Append("\":\"");
30                         try
31                         {
32                             jsonBuilder.Append(Convert.ToDecimal(dt.Rows[i][j]).ToString("f2"));
33 
34                         }
35                         catch (Exception)
36                         {
37 
38                             jsonBuilder.Append(0);
39                         }
40                         jsonBuilder.Append("\",");
41                     }
42                     //时间类型则变形
43                     else if (dt.Columns[j].DataType.ToString() == "System.DateTime")
44                     {
45                         jsonBuilder.Append("\"");
46                         jsonBuilder.Append(dt.Columns[j].ColumnName);
47                         jsonBuilder.Append("\":\"");
48                         try
49                         {
50                             jsonBuilder.Append(Convert.ToDateTime(dt.Rows[i][j]).ToString("yyyy/MM/dd HH:mm:ss"));
51                         }
52                         catch (Exception)
53                         {
54                             jsonBuilder.Append("");
55                         }
56                         jsonBuilder.Append("\",");
57                     }
58                     else
59                     {
60                         jsonBuilder.Append("\"");
61                         jsonBuilder.Append(dt.Columns[j].ColumnName);
62                         jsonBuilder.Append("\":\"");
63 
64                         try
65                         {
66                             jsonBuilder.Append(dt.Rows[i][j].ToString());
67 
68                         }
69                         catch (Exception)
70                         {
71 
72                             jsonBuilder.Append("");
73                         }
74                         jsonBuilder.Append("\",");
75                     }
76 
77                 }
78                 jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
79                 jsonBuilder.Append("},");
80             }
81             jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
82             jsonBuilder.Append("]");
83             //  jsonBuilder.Append("}"); 
84 
85             return Regex.Replace(jsonBuilder.ToString(), @"[\r\n]", "");
86         }