using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Data;
using System.Text;
namespace NC.Common
{
/// <summary>
/// JSON幫助類
/// </summary>
public class JsonHelper
{
/// <summary>
/// 對象轉JSON
/// </summary>
/// <param name="obj">對象</param>
/// <returns>JSON格式的字符串</returns>
public static string ObjectToJSON(object obj)
{
try
{
byte[] b = Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(obj));
return Encoding.UTF8.GetString(b);
}
catch (Exception ex)
{
throw new Exception("JSONHelper.ObjectToJSON(): " + ex.Message);
}
}
/// <summary>
/// 數據錶轉鍵值對集合
/// 把DataTable轉成 List集合, 存每一行
/// 集合中放的是鍵值對字典,存每一列
/// </summary>
/// <param name="dt">數據表</param>
/// <returns>哈希表數組</returns>
public static List<Dictionary<string, object>> DataTableToList(DataTable dt)
{
List<Dictionary<string, object>> list
= new List<Dictionary<string, object>>();
foreach (DataRow dr in dt.Rows)
{
Dictionary<string, object> dic = new Dictionary<string, object>();
foreach (DataColumn dc in dt.Columns)
{
dic.Add(dc.ColumnName, dr[dc.ColumnName]);
}
list.Add(dic);
}
return list;
}
/// <summary>
/// 數據集轉鍵值對數組字典
/// </summary>
/// <param name="dataSet">數據集</param>
/// <returns>鍵值對數組字典</returns>
public static Dictionary<string, List<Dictionary<string, object>>> DataSetToDic(DataSet ds)
{
Dictionary<string, List<Dictionary<string, object>>> result = new Dictionary<string, List<Dictionary<string, object>>>();
foreach (DataTable dt in ds.Tables)
result.Add(dt.TableName, DataTableToList(dt));
return result;
}
/// <summary>
/// 數據錶轉JSON
/// </summary>
/// <param name="dataTable">數據表</param>
/// <returns>JSON字符串</returns>
public static string DataTableToJSON(DataTable dt)
{
return ObjectToJSON(DataTableToList(dt));
}
/// <summary>
/// JSON文本轉對象,泛型方法
/// </summary>
/// <typeparam name="T">類型</typeparam>
/// <param name="jsonText">JSON文本</param>
/// <returns>指定類型的對象</returns>
public static T JSONToObject<T>(string jsonText)
{
//JavaScriptSerializer jss = new JavaScriptSerializer();
try
{
return JsonConvert.DeserializeObject<T>(jsonText);
//return jss.Deserialize<T>(jsonText);
}
catch (Exception ex)
{
throw new Exception("JSONHelper.JSONToObject(): " + ex.Message);
}
}
/// <summary>
/// 將JSON文本轉換爲數據表數據
/// </summary>
/// <param name="jsonText">JSON文本</param>
/// <returns>數據表字典</returns>
public static Dictionary<string, List<Dictionary<string, object>>> TablesDataFromJSON(string jsonText)
{
return JSONToObject<Dictionary<string, List<Dictionary<string, object>>>>(jsonText);
}
/// <summary>
/// 將JSON文本轉換成數據行
/// </summary>
/// <param name="jsonText">JSON文本</param>
/// <returns>數據行的字典</returns>
public static Dictionary<string, object> DataRowFromJSON(string jsonText)
{
return JSONToObject<Dictionary<string, object>>(jsonText);
}
}
}
