Datatable转成Json方式两则

1，

Asp.net C# 使用Newtonsoft.Json 实现DataTable转Json格式数据

1.这里下载:http://www.newtonsoft.com/products/json/ 
安装: 
   1.解压下载文件,得到Newtonsoft.Json.dll 
   2.在项目中添加引用 
2.引入命名空间

C#代码  

1. using Newtonsoft.Json;
2. using Newtonsoft.Json.Converters;

3.把datatable转换成json格式

C#代码  

1. public string GetAllCategory()
2. {
3. string result = "";
4. DataTable dt= catDAO.GetAllCategory();
5. result=JsonConvert.SerializeObject(dt, new DataTableConverter());
6. return result;
7. }

其他序列化和反序列化，请自行参考文档资料

2，/*==============================================================================
*
* Filename: DatatableToJson.cs
* Description: 主要包含两个方法：
   1. 获取的DataTable 对象 转换为Json 字符串
   2. Json 字符串 转换为 DataTable数据集合
* Version: 1.0
* Created: 2012.08.23
* Author: liangjw
* E-mail : liangjw0504@163.com
* Q   Q   : 592568532
* Profile Url：http://90ideas.net/
* Company: Copyright (C) Create Family Wealth Power By Peter
*
==============================================================================*/
 * 备注信息： 上传部分自己总结的常用方法的封装，有不足和不完美之处，希望大家指出来，愿意一起
 * 主要研究erp,cms,crm,b2b,oa等系统和网站的开发，欢迎有共同追求和学的IT人员一起学习和交流。
 * 学习和讨论有关asp.net  mvc ,Ajax ,jquery ,html/css, xml ,sqlserver ,wpf,IIS以及服务器的搭建和安全性相关技术的交流和学习。

#region  DataTable 转换为Json字符串实例方法
/// <summary>
/// GetClassTypeJosn 的摘要说明
/// </summary>
public class GetClassTypeJosn : IHttpHandler
{
    /// <summary>
    /// 文件名:DataTable 和Json 字符串互转
    /// 版权所有:Copyright (C) Create Family Wealth liangjw
    /// 创建标示：2013-08-03
    /// </summary>
    //用法说明实例
     public void ProcessRequest(HttpContext context)
    {
        context.Response.ContentType = "application/json";
        context.Response.Charset = "utf-8";
        HttpRequest req = context.Request;
        string method = req["method"].ToStr().ToLower();
 
 
       //获取合同明细列表  DataTable 转换为Json字符串
        if (method == "txtdate")
        {
            string json = "";
            BO.MakeContractMx bll = new MakeContractMx();
            DataSet ds = bll.GetDataTable();
            if (ds.Tables.Count > 0)
            {
                json =ToJson(ds.Tables[0]);
            }
            context.Response.Write(json);
            return;
        }
 
    }
 
   public bool IsReusable
    {
        get
        {
            return false;
        }
    }
}
 
   #endregion
 
    #region Json字符串转换为DataTable 实例方法
 
    public DataTable JsonToDataTable(json)
    {
       DataTable  dt= ToDataTable(json);
         return dt;
    }
     
   #endregion
 
    #region DataTable 转换为Json 字符串
    /// <summary>
    /// DataTable 对象 转换为Json 字符串
    /// </summary>
    /// <param name="dt"></param>
    /// <returns></returns>
    public static string ToJson(this DataTable dt)
    {
        JavaScriptSerializer javaScriptSerializer = new JavaScriptSerializer();
        javaScriptSerializer.MaxJsonLength = Int32.MaxValue; //取得最大数值
        ArrayList arrayList = new ArrayList();
        foreach (DataRow dataRow in dt.Rows)
        {
            Dictionary<string, object> dictionary = new Dictionary<string, object>();  //实例化一个参数集合
            foreach (DataColumn dataColumn in dt.Columns)
            {
                dictionary.Add(dataColumn.ColumnName, dataRow[dataColumn.ColumnName].ToStr());
            }
            arrayList.Add(dictionary); //ArrayList集合中添加键值
        }
 
        return javaScriptSerializer.Serialize(arrayList);  //返回一个json字符串
    }
    #endregion
 
    #region Json 字符串 转换为 DataTable数据集合
    /// <summary>
    /// Json 字符串 转换为 DataTable数据集合
    /// </summary>
    /// <param name="json"></param>
    /// <returns></returns>
    public static DataTable ToDataTable(this string json)
    {
        DataTable dataTable = new DataTable();  //实例化
        DataTable result;
        try
        {
            JavaScriptSerializer javaScriptSerializer = new JavaScriptSerializer();
            javaScriptSerializer.MaxJsonLength = Int32.MaxValue; //取得最大数值
            ArrayList arrayList = javaScriptSerializer.Deserialize<ArrayList>(json);
            if (arrayList.Count > 0)
            {
                foreach (Dictionary<string, object> dictionary in arrayList)
                {
                    if (dictionary.Keys.Count<string>() == 0)
                    {
                        result = dataTable;
                        return result;
                    }
                    if (dataTable.Columns.Count == 0)
                    {
                        foreach (string current in dictionary.Keys)
                        {
                            dataTable.Columns.Add(current, dictionary[current].GetType());
                        }
                    }
                    DataRow dataRow = dataTable.NewRow();
                    foreach (string current in dictionary.Keys)
                    {
                        dataRow[current] = dictionary[current];
                    }
 
                    dataTable.Rows.Add(dataRow); //循环添加行到DataTable中
                }
            }
        }
        catch
        {
        }
        result = dataTable;
        return result;
    }
    #endregion
 
    #region 转换为string字符串类型
    /// <summary>
    ///  转换为string字符串类型
    /// </summary>
    /// <param name="s">获取需要转换的值</param>
    /// <param name="format">需要格式化的位数</param>
    /// <returns>返回一个新的字符串</returns>
    public static string ToStr(this object s, string format = "")
    {
        string result = "";
        try
        {
            if (format == "")
            {
                result = s.ToString();
            }
            else
            {
                result = string.Format("{0:" + format + "}", s);
            }
        }
        catch
        {
        }
        return result;
    }
   #endregion