将datatable和dataset中的数据转为json数据 与反转

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebApplication2
{
public partial class WebForm1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
//模拟dataTable 1
DataTable dt1 = new DataTable("myTable1");
dt1.Columns.Add("ID", typeof(Int32));
dt1.Columns.Add("name", typeof(string));
dt1.Columns.Add("description", typeof(string));
for (int i = 1; i < 10; i++)
{
DataRow dr = dt1.NewRow();
dr["ID"] = "007" + i;
dr["name"] = "我是00" + i;
dr["description"] = "描述" + i;
dt1.Rows.Add(dr);
}
//模拟dataTable 2
DataTable dt2 = new DataTable("myTable2");
dt2.Columns.Add("ID", typeof(Int32));
dt2.Columns.Add("name", typeof(string));
dt2.Columns.Add("description", typeof(string));
for (int i = 1; i < 10; i++)
{
DataRow dr = dt2.NewRow();
dr["ID"] = "007" + i;
dr["name"] = "我是00" + i;
dr["description"] = "描述" + i;
dt2.Rows.Add(dr);
}
//模拟dataSet
DataSet ds = new DataSet();
ds.Tables.Add(dt1);
ds.Tables.Add(dt2);

dtJson.InnerHtml = ToJson(dt1);
dsJson.InnerHtml = ToJson(ds);

fileJson(ToJson(ds));
}

public bool fileJson(string file) {
FileStream fs = new FileStream("e://Login.json", FileMode.Create);
StreamWriter sw = new StreamWriter(fs);
sw.Write(file);
sw.Flush();
sw.Close();
fs.Close();

return true;
}

public static string ToJson(DataTable dt)
{
StringBuilder jsonBuilder = new StringBuilder();
jsonBuilder.Append("{");
jsonBuilder.Append(singleDtToJson(dt));
jsonBuilder.Append("}");
return jsonBuilder.ToString();
}

public static string ToJson(DataSet ds)
{
StringBuilder json = new StringBuilder();
json.Append("{");
foreach (DataTable dt in ds.Tables)
{
json.Append(singleDtToJson(dt));
json.Append(",");
}
json.Remove(json.Length - 1, 1);
json.Append("}");
return json.ToString();
}
//为了配合dataset，将datatable固定成一个格式，利于dataset拼接成数组
public static string singleDtToJson(DataTable dt)
{
StringBuilder jsonBuilder = new StringBuilder();
jsonBuilder.Append("\"");
jsonBuilder.Append(dt.TableName.ToString());
jsonBuilder.Append("\":[");
for (int i = 0; i < dt.Rows.Count; i++)
{
jsonBuilder.Append("{");
for (int j = 0; j < dt.Columns.Count; j++)
{
jsonBuilder.Append("\"");
jsonBuilder.Append(dt.Columns[j].ColumnName);
jsonBuilder.Append("\":\"");
jsonBuilder.Append(dt.Rows[i][j].ToString());
jsonBuilder.Append("\",");
}
jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
jsonBuilder.Append("},");
}
jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
jsonBuilder.Append("]");
return jsonBuilder.ToString();
}
}
}

/// <summary>

        /// 将json转换为DataTable

        /// </summary>

        /// <param name="strJson">得到的json</param>

        /// <returns></returns>

        private DataTable JsonToDataTable(string strJson)

        {

            //转换json格式

            strJson = strJson.Replace(",\"", "*\"").Replace("\":", "\"#").ToString();

            //取出表名   

            var rg = new Regex(@"(?<={)[^:]+(?=:\[)", RegexOptions.IgnoreCase);

            string strName = rg.Match(strJson).Value;

            DataTable tb = null;

            //去除表名   

            strJson = strJson.Substring(strJson.IndexOf("[") + 1);

            strJson = strJson.Substring(0, strJson.IndexOf("]"));

            //获取数据   

            rg = new Regex(@"(?<={)[^}]+(?=})");

            MatchCollection mc = rg.Matches(strJson);

            for (int i = 0; i < mc.Count; i++)

            {

                string strRow = mc[i].Value;

                string[] strRows = strRow.Split('*');

                //创建表   

                if (tb == null)

                {

                    tb = new DataTable();

                    tb.TableName = strName;

                    foreach (string str in strRows)

                    {

                        var dc = new DataColumn();

                        string[] strCell = str.Split('#');

                        if (strCell[0].Substring(0, 1) == "\"")

                        {

                            int a = strCell[0].Length;

                            dc.ColumnName = strCell[0].Substring(1, a - 2);

                        }

                        else

                        {

                            dc.ColumnName = strCell[0];

                        }

                        tb.Columns.Add(dc);

                    }

                    tb.AcceptChanges();

                }

                //增加内容   

                DataRow dr = tb.NewRow();

                for (int r = 0; r < strRows.Length; r++)

                {

                    dr[r] = strRows[r].Split('#')[1].Trim().Replace("，", ",").Replace("：", ":").Replace("\"", "");

                }

                tb.Rows.Add(dr);

                tb.AcceptChanges();

            }

            return tb;

        }