1 #region DataTable 转换为Json字符串实例方法
2 /// <summary>
3 /// GetClassTypeJosn 的摘要说明
4 /// </summary>
5 public class GetClassTypeJosn : IHttpHandler
6 {
7 /// <summary>
8 /// 文件名:DataTable 和Json 字符串互转
9 /// 版权所有:Copyright (C) Create Family Wealth liangjw
10 /// 创建标示：2013-08-03
11 /// </summary>
12 //用法说明实例
13 public void ProcessRequest(HttpContext context)
14 {
15 context.Response.ContentType = "application/json";
16 context.Response.Charset = "utf-8";
17 HttpRequest req = context.Request;
18 string method = req["method"].ToStr().ToLower();
19
20
21 //获取合同明细列表 DataTable 转换为Json字符串
22 if (method == "txtdate")
23 {
24 string json = "";
25 BO.MakeContractMx bll = new MakeContractMx();
26 DataSet ds = bll.GetDataTable();
27 if (ds.Tables.Count > 0)
28 {
29 json =ToJson(ds.Tables[0]);
30 }
31 context.Response.Write(json);
32 return;
33 }
34
35 }
36
37 public bool IsReusable
38 {
39 get
40 {
41 return false;
42 }
43 }
44 }
45
46 #endregion
47
48 #region Json字符串转换为DataTable 实例方法
49
50 public DataTable JsonToDataTable(json)
51 {
52 DataTable dt= ToDataTable(json);
53 return dt;
54 }
55
56 #endregion
57
58 #region DataTable 转换为Json 字符串
59 /// <summary>
60 /// DataTable 对象 转换为Json 字符串
61 /// </summary>
62 /// <param name="dt"></param>
63 /// <returns></returns>
64 public static string ToJson(this DataTable dt)
65 {
66 JavaScriptSerializer javaScriptSerializer = new JavaScriptSerializer();
67 javaScriptSerializer.MaxJsonLength = Int32.MaxValue; //取得最大数值
68 ArrayList arrayList = new ArrayList();
69 foreach (DataRow dataRow in dt.Rows)
70 {
71 Dictionary<string, object> dictionary = new Dictionary<string, object>(); //实例化一个参数集合
72 foreach (DataColumn dataColumn in dt.Columns)
73 {
74 dictionary.Add(dataColumn.ColumnName, dataRow[dataColumn.ColumnName].ToStr());
75 }
76 arrayList.Add(dictionary); //ArrayList集合中添加键值
77 }
78
79 return javaScriptSerializer.Serialize(arrayList); //返回一个json字符串
80 }
81 #endregion
82
83 #region Json 字符串 转换为 DataTable数据集合
84 /// <summary>
85 /// Json 字符串 转换为 DataTable数据集合
86 /// </summary>
87 /// <param name="json"></param>
88 /// <returns></returns>
89 public static DataTable ToDataTable(this string json)
90 {
91 DataTable dataTable = new DataTable(); //实例化
92 DataTable result;
93 try
94 {
95 JavaScriptSerializer javaScriptSerializer = new JavaScriptSerializer();
96 javaScriptSerializer.MaxJsonLength = Int32.MaxValue; //取得最大数值
97 ArrayList arrayList = javaScriptSerializer.Deserialize<ArrayList>(json);
98 if (arrayList.Count > 0)
99 {
100 foreach (Dictionary<string, object> dictionary in arrayList)
101 {
102 if (dictionary.Keys.Count<string>() == 0)
103 {
104 result = dataTable;
105 return result;
106 }
107 if (dataTable.Columns.Count == 0)
108 {
109 foreach (string current in dictionary.Keys)
110 {
111 dataTable.Columns.Add(current, dictionary[current].GetType());
112 }
113 }
114 DataRow dataRow = dataTable.NewRow();
115 foreach (string current in dictionary.Keys)
116 {
117 dataRow[current] = dictionary[current];
118 }
119
120 dataTable.Rows.Add(dataRow); //循环添加行到DataTable中
121 }
122 }
123 }
124 catch
125 {
126 }
127 result = dataTable;
128 return result;
129 }
130 #endregion
131
132 #region 转换为string字符串类型
133 /// <summary>
134 /// 转换为string字符串类型
135 /// </summary>
136 /// <param name="s">获取需要转换的值</param>
137 /// <param name="format">需要格式化的位数</param>
138 /// <returns>返回一个新的字符串</returns>
139 public static string ToStr(this object s, string format = "")
140 {
141 string result = "";
142 try
143 {
144 if (format == "")
145 {
146 result = s.ToString();
147 }
148 else
149 {
150 result = string.Format("{0:" + format + "}", s);
151 }
152 }
153 catch
154 {
155 }
156 return result;
157 }
158 #endregion
转载：http://www.cnblogs.com/markli/p/4468889.html
