C# 怎么将json 转换成 datatable

Posted 2023-03-14

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每个大括号相当于一行数据 冒号前字段相当于 列名，后为列值

怎么解出呢

主要包含两个方法：
1. 获取的DataTable 对象 转换为Json 字符串
2. Json 字符串 转换为 DataTable数据集合

#region DataTable 转换为Json字符串实例方法
/// <summary>
/// GetClassTypeJosn 的摘要说明
/// </summary>
public class GetClassTypeJosn : IHttpHandler

/// <summary>
/// 文件名:DataTable 和Json 字符串互转
/// 版权所有:Copyright (C) Create Family Wealth liangjw
/// 创建标示：2013-08-03
/// </summary>
//用法说明实例
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();

//获取合同明细列表 DataTable 转换为Json字符串
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字符串转换为DataTable 实例方法

public DataTable JsonToDataTable(json)

DataTable dt= ToDataTable(json);
return dt;


#endregion

#region DataTable 转换为Json 字符串
/// <summary>
/// DataTable 对象 转换为Json 字符串
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string ToJson(this DataTable dt)

javascriptSerializer javaScriptSerializer = new JavaScriptSerializer();
javaScriptSerializer.MaxJsonLength = Int32.MaxValue; //取得最大数值
ArrayList arrayList = new ArrayList();
foreach (DataRow dataRow in dt.Rows)

Dictionary<string, object> dictionary = new Dictionary<string, object>(); //实例化一个参数集合
foreach (DataColumn dataColumn in dt.Columns)

dictionary.Add(dataColumn.ColumnName, dataRow[dataColumn.ColumnName].ToStr());

arrayList.Add(dictionary); //ArrayList集合中添加键值


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

#endregion

#region Json 字符串 转换为 DataTable数据集合
/// <summary>
/// Json 字符串 转换为 DataTable数据集合
/// </summary>
/// <param name="json"></param>
/// <returns></returns>
public static DataTable ToDataTable(this string json)

DataTable dataTable = new DataTable(); //实例化
DataTable result;
try

JavaScriptSerializer javaScriptSerializer = new JavaScriptSerializer();
javaScriptSerializer.MaxJsonLength = Int32.MaxValue; //取得最大数值
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); //循环添加行到DataTable中



catch


result = dataTable;
return result;

#endregion

#region 转换为string字符串类型
/// <summary>
/// 转换为string字符串类型
/// </summary>
/// <param name="s">获取需要转换的值</param>
/// <param name="format">需要格式化的位数</param>
/// <returns>返回一个新的字符串</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 参考技术A /// <summary>   
/// 将 Json 解析成 DateTable。  
/// Json 数据格式如: 
///     table:[column1:1,column2:2,column3:3,column1:1,column2:2,column3:3] /// </summary>   
/// <param name="strJson">要解析的 Json 字符串</param>   
/// <returns>返回 DateTable</returns>   
public static DataTable JsonToDataTable(string strJson)

 // 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(':');
    dc.ColumnName = strCell[0].Replace("\\"", "");
    tb.Columns.Add(dc);
   
   tb.AcceptChanges();
  
  // 增加内容   
  DataRow dr = tb.NewRow();
  for (int j = 0; j < strRows.Length; j++)
  
   dr[j] = strRows[j].Split(':')[1].Replace("\\"", "");
  
  tb.Rows.Add(dr);
  tb.AcceptChanges();
 
 return tb;

引入命名空间 System.Text.RegularExpressions。

参考技术B 循环 jason 自己转吧