using System; 

using System.Collections.Generic; 

using System.Web; 

using System.Web.Script.Serialization; 

using System.Data; 

namespace Sheng.Common 

{ 

/// <summary> 

/// JSON帮助类 

/// </summary> 

public class JSONHelper 

{ 

/// <summary> 

/// 对象转JSON 

/// </summary> 

/// <param name="obj">对象</param> 

/// <returns>JSON格式的字符串</returns> 

public static string ObjectToJSON(object obj) 

{ 

JavaScriptSerializer jss = new JavaScriptSerializer(); 

try 

{ 

return jss.Serialize(obj); 

} 

catch (Exception ex) 

{ 

throw new Exception("JSONHelper.ObjectToJSON(): " + ex.Message); 

} 

} 

/// <summary> 

/// 数据表转键值对集合 

/// 把DataTable转成 List集合, 存每一行 

/// 集合中放的是键值对字典,存每一列 

/// </summary> 

/// <param name="dt">数据表</param> 

/// <returns>哈希表数组</returns> 

public static List<Dictionary<string, object>> DataTableToList(DataTable dt) 

{ 

List<Dictionary<string, object>> list 

= new List<Dictionary<string, object>>(); 

foreach (DataRow dr in dt.Rows) 

{ 

Dictionary<string, object> dic = new Dictionary<string, object>(); 

foreach (DataColumn dc in dt.Columns) 

{ 

dic.Add(dc.ColumnName, dr[dc.ColumnName]); 

} 

list.Add(dic); 

} 

return list; 

} 

/// <summary> 

/// 数据集转键值对数组字典 

/// </summary> 

/// <param name="dataSet">数据集</param> 

/// <returns>键值对数组字典</returns> 

public static Dictionary<string, List<Dictionary<string, object>>> DataSetToDic(DataSet ds) 

{ 

Dictionary<string, List<Dictionary<string, object>>> result = new Dictionary<string, List<Dictionary<string, object>>>(); 

foreach (DataTable dt in ds.Tables) 

result.Add(dt.TableName, DataTableToList(dt)); 

return result; 

} 

/// <summary> 

/// 数据表转JSON 

/// </summary> 

/// <param name="dataTable">数据表</param> 

/// <returns>JSON字符串</returns> 

public static string DataTableToJSON(DataTable dt) 

{ 

return ObjectToJSON(DataTableToList(dt)); 

} 

/// <summary> 

/// JSON文本转对象,泛型方法 

/// </summary> 

/// <typeparam name="T">类型</typeparam> 

/// <param name="jsonText">JSON文本</param> 

/// <returns>指定类型的对象</returns> 

public static T JSONToObject<T>(string jsonText) 

{ 

JavaScriptSerializer jss = new JavaScriptSerializer(); 

try 

{ 

return jss.Deserialize<T>(jsonText); 

} 

catch (Exception ex) 

{ 

throw new Exception("JSONHelper.JSONToObject(): " + ex.Message); 

} 

} 

/// <summary> 

/// 将JSON文本转换为数据表数据 

/// </summary> 

/// <param name="jsonText">JSON文本</param> 

/// <returns>数据表字典</returns> 

public static Dictionary<string, List<Dictionary<string, object>>> TablesDataFromJSON(string jsonText) 

{ 

return JSONToObject<Dictionary<string, List<Dictionary<string, object>>>>(jsonText); 

} 

/// <summary> 

/// 将JSON文本转换成数据行 

/// </summary> 

/// <param name="jsonText">JSON文本</param> 

/// <returns>数据行的字典</returns> 

public static Dictionary<string, object> DataRowFromJSON(string jsonText) 

{ 

return JSONToObject<Dictionary<string, object>>(jsonText); 

} 

} 

} 

System.Web.Script.Serialization命名空间是.Net 3.5新添加的. 

如果要在3.5以下版本中使用,可以下载3.5中的System.Web.Extensions.dll 引入到自己的应用中.