[C#]Datatable和json互相转换操作

  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

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