Ⅰ C# 怎麼將json 轉換成 datatable
主要包含兩個方法：
1. 獲取的DataTable 對象 轉換為 字元串
2. Json 字元串 轉換為 DataTable數據集合
#region DataTable 轉換為Json字元串實例方法
/// <summary>
/// GetClassTypeJosn 的摘要說明
/// </summary>
public class GetClassTypeJosn : IHttpHandler
{
/// <summary>
/// 文件名:DataTable 和Json 字元串互轉
/// 版權所有:Copyright (C) Create Family Wealth liangjw
/// 創建標示：2013-08-03
/// </summary>
//用法說明實例
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "application/json";
context.Response.Charset = "utf-8";
HttpRequest req = context.Request;
string method = req["method"].ToStr().ToLower();
//獲取合同明細列表 DataTable 轉換為Json字元串
if (method == "txtdate")
{
string json = "";
BO.MakeContractMx bll = new MakeContractMx();
DataSet ds = bll.GetDataTable();
if (ds.Tables.Count > 0)
{
json =ToJson(ds.Tables[0]);
}
context.Response.Write(json);
return;
}
}
public bool IsReusable
{
get
{
return false;
}
}
}
#endregion
#region Json字元串轉換為DataTable 實例方法
public DataTable JsonToDataTable(json)
{
DataTable dt= ToDataTable(json);
return dt;
}
#endregion
#region DataTable 轉換為Json 字元串
/// <summary>
/// DataTable 對象 轉換為Json 字元串
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string ToJson(this DataTable dt)
{
javaScriptSerializer javaScriptSerializer = new JavaScriptSerializer();
javaScriptSerializer.MaxJsonLength = Int32.MaxValue; //取得最大數值
ArrayList arrayList = new ArrayList();
foreach (DataRow dataRow in dt.Rows)
{
Dictionary<string, object> dictionary = new Dictionary<string, object>(); //實例化一個參數集合
foreach (DataColumn dataColumn in dt.Columns)
{
dictionary.Add(dataColumn.ColumnName, dataRow[dataColumn.ColumnName].ToStr());
}
arrayList.Add(dictionary); //ArrayList集合中添加鍵值
}
return javaScriptSerializer.Serialize(arrayList); //返回一個json字元串
}
#endregion
#region Json 字元串 轉換為 DataTable數據集合
/// <summary>
/// Json 字元串 轉換為 DataTable數據集合
/// </summary>
/// <param name="json"></param>
/// <returns></returns>
public static DataTable ToDataTable(this string json)
{
DataTable dataTable = new DataTable(); //實例化
DataTable result;
try
{
JavaScriptSerializer javaScriptSerializer = new JavaScriptSerializer();
javaScriptSerializer.MaxJsonLength = Int32.MaxValue; //取得最大數值
ArrayList arrayList = javaScriptSerializer.Deserialize<ArrayList>(json);
if (arrayList.Count > 0)
{
foreach (Dictionary<string, object> dictionary in arrayList)
{
if (dictionary.Keys.Count<string>() == 0)
{
result = dataTable;
return result;
}
if (dataTable.Columns.Count == 0)
{
foreach (string current in dictionary.Keys)
{
dataTable.Columns.Add(current, dictionary[current].GetType());
}
}
DataRow dataRow = dataTable.NewRow();
foreach (string current in dictionary.Keys)
{
dataRow[current] = dictionary[current];
}
dataTable.Rows.Add(dataRow); //循環添加行到DataTable中
}
}
}
catch
{
}
result = dataTable;
return result;
}
#endregion
#region 轉換為string字元串類型
/// <summary>
/// 轉換為string字元串類型
/// </summary>
/// <param name="s">獲取需要轉換的值</param>
/// <param name="format">需要格式化的位數</param>
/// <returns>返回一個新的字元串</returns>
public static string ToStr(this object s, string format = "")
{
string result = "";
try
{
if (format == "")
{
result = s.ToString();
}
else
{
result = string.Format("{0:" + format + "}", s);
}
}
catch
{
}
return result;
}
#endregion