CollatingOfData 之 JsonHelper

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

using System.Data;
using System.Collections;
using System.Web.Script.Serialization;

/// <summary>
///JsonHelper 的摘要说明
/// </summary>
public class JsonHelper
{
public JsonHelper()
{
//
//TODO: 在此处添加构造函数逻辑
//
}

#region Json 与 DataTable 的相互转换

/// <summary>
/// Json 字符串转换为DataTable数据集合
/// </summary>
/// <param name="strJson">待转换的Json字符串</param>
/// <returns>返回DataTable集合</returns>
public static DataTable JsonToDataTable(string strJson)
{
DataTable dt = new DataTable();  //实例化
JavaScriptSerializer javaScriptSerializer = new JavaScriptSerializer();
javaScriptSerializer.MaxJsonLength = Int32.MaxValue; //取得最大数值

ArrayList arrayList = javaScriptSerializer.Deserialize<ArrayList>(strJson);
if (arrayList.Count > 0)
{
foreach (Dictionary<string, object> dic in arrayList)
{
if (dic.Keys.Count<string>() == 0)
{
return dt;
}
if (dt.Columns.Count == 0)
{
foreach (string key in dic.Keys)
{
dt.Columns.Add(key, dic[key].GetType());
}
}
DataRow dataRow = dt.NewRow();
foreach (string key in dic.Keys)
{
dataRow[key] = dic[key];
}

dt.Rows.Add(dataRow); //循环添加行到DataTable中
}
}
return dt;
}

/// <summary>
/// DataTable 对象 转换为Json 字符串
/// </summary>
/// <param name="dt">带转换的DataTable数据集合</param>
/// <returns>返回Json字符串</returns>
public static string DataTableToJson(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> dic = new Dictionary<string, object>();  //实例化一个参数集合
foreach (DataColumn dataColumn in dt.Columns)
{
dic.Add(dataColumn.ColumnName, dataRow[dataColumn.ColumnName].ToString());
}
arrayList.Add(dic); //ArrayList集合中添加键值
}

return javaScriptSerializer.Serialize(arrayList);  //返回一个json字符串
}

#endregion Json 与 DataTable 的相互转换

}