CollatingOfData 之 JsonHelper

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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

}

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