C# Json帮助类

using System;
using System.Collections.Generic;
using System.Web;
using System.Text;
using System.Reflection;
using System.Collections;
using System.Data;
using System.Data.Common;
using System.Web.Script.Serialization;

/// <summary>
///JsonHandleHelper 的摘要说明
/// </summary>
public class JsonHandleHelper
{

/// <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>
/// 转换对象为JSON格式数据
/// </summary>
/// <typeparam name="T">类</typeparam>
/// <param name="obj">对象</param>
/// <returns>字符格式的JSON数据</returns>
public static string GetJSON<T>(object obj)
{
string result = String.Empty;
try
{
System.Runtime.Serialization.Json.DataContractJsonSerializer serializer =
new System.Runtime.Serialization.Json.DataContractJsonSerializer(typeof(T));
using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
{
serializer.WriteObject(ms, obj);
result = System.Text.Encoding.UTF8.GetString(ms.ToArray());
}
}
catch (Exception ex)
{
throw ex;
}
return result;
}
/// <summary>
/// 转换List<T>的数据为JSON格式
/// </summary>
/// <typeparam name="T">类</typeparam>
/// <param name="vals">列表值</param>
/// <returns>JSON格式数据</returns>
public static string JSON<T>(List<T> vals)
{
System.Text.StringBuilder st = new System.Text.StringBuilder();
try
{
System.Runtime.Serialization.Json.DataContractJsonSerializer s = new System.Runtime.Serialization.Json.DataContractJsonSerializer(typeof(T));

foreach (T city in vals)
{
using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
{
s.WriteObject(ms, city);
st.Append(System.Text.Encoding.UTF8.GetString(ms.ToArray()));
}
}
}
catch (Exception ex)
{
throw ex;
}

return st.ToString();
}
/// <summary>
/// JSON格式字符转换为T类型的对象
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="jsonStr"></param>
/// <returns></returns>
public static T ParseFormByJson<T>(string jsonStr)
{
T obj = Activator.CreateInstance<T>();
using (System.IO.MemoryStream ms =
new System.IO.MemoryStream(System.Text.Encoding.UTF8.GetBytes(jsonStr)))
{
System.Runtime.Serialization.Json.DataContractJsonSerializer serializer =
new System.Runtime.Serialization.Json.DataContractJsonSerializer(typeof(T));
return (T)serializer.ReadObject(ms);
}
}
/// <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);
}

}