将DataSet里的数据转换成Json格式

转：http://www.cnblogs.com/simonblog/archive/2010/05/12/1733139.html

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;

namespace ConsoleApplication1
{
    public static class DataSetToJson
    {
        public static string DSToJson(this DataSet ds, string JsonName, string[] ParName)
        {
            try
            {
                if (ds == null)
                {
                    return "DataSet Is Null ,So I Can't Do It To Json!";
                }
                if (JsonName.Length < 1)
                {
                    return "You Set The Json Name Is Wrong!";
                }
                if (ds.Tables[0].Columns.Count < ParName.Length)
                {
                    return "You Give The ParName Is Bigger Than DataSet Columns!";
                }
                string josn = "{" + JsonName + ":[";
                string temp = "";
                for (int j = 0; j < ds.Tables[0].Rows.Count; j++)
                {
                    temp = temp + "{";
                    for (int i = 0; i < ParName.Length; i++)
                    {
                        temp += "" + ParName[i] + ":\'" + ds.Tables[0].Rows[j][ParName[i]] + "\'";
                        if (i != ParName.Length - 1)
                        {
                            temp = temp + ",";
                        }
                   }
                    if (j == ds.Tables[0].Rows.Count - 1)
                    {
                        temp = temp + "}";
                    }
                    else
                    {
                        temp = temp + "},";
                    }
                }
                josn = josn + temp + "]}";
                return josn;
            }
            catch (Exception ex)
            {
                return "Codeing is Error----" + ex.ToString();
            }
        }
    }
}

这是一种对数据取出的数据进行转换成json格式，还有一种就是可以把数据库里的数据存入到一个IList<>里，然后通过json里的JsonWriter来转换成json格式，这里就不显示代码了，，