.net 中 Json数据转实体类，实体类转Json

来源：互联网发布：淘宝助理无法同步店铺编辑：程序博客网时间：2024/06/05 19:45

1.获取一个页面的json值，转换为实体类

public static void GetPurchaseMatPriceLogList()

{
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create("www.json.com");
request.Timeout = 5000;
request.Method = "GET";
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Console.WriteLine("内容类型：" + response.ContentType);
Console.WriteLine("内容长度：" + response.ContentLength);
Console.WriteLine("服务器名：" + response.Server);
Console.WriteLine("资源的URI：" + response.ResponseUri);
Console.WriteLine("HTTP协议版本：" + response.ProtocolVersion);
Console.WriteLine("相应状态：" + response.StatusCode);
Console.WriteLine("相应方法：" + response.Method);
//头信息
for (int i = 0; i < response.Headers.Count; ++i)
{
Console.WriteLine("\nHeader Name:{0},----------Value:{1}", response.Headers.Keys[i], response.Headers[i]);
}

StreamReader sr = new StreamReader(response.GetResponseStream());
string jsonstr = sr.ReadToEnd(); //这是获取到的Json字符串
//开始转换
DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(List<PurchaseMatPriceLogList>));
//jsonstr = "[" + jsonstr + "]";
MemoryStream stream = new MemoryStream(Encoding.UTF8.GetBytes(jsonstr));
object ob = serializer.ReadObject(stream);
List<PurchaseMatPriceLogList> ls = (List<PurchaseMatPriceLogList>)ob;
if (ls == null)
{
throw new ArgumentNullException("未获取到最新的数据");
}

//判断每一条数据是不是当天，如果是就更新，不是就添加
foreach (PurchaseMatPriceLogList pl in ls)
{
//暂时只处理板材
if (pl.metel_type_title == "不锈钢板" || pl.metel_type_title == "碳钢板材")
{
PurchaseMatPriceLogApp.AddIUDPurchaseMatPriceLog(pl);
}
}

}

2.将实体类中的值转换为json

public string getJsonInfo()
{
UserInfo userInfo = new UserInfo();
//userInfo.strNameInfo = "张三";
//userInfo.intAgeInfo = 23;
//userInfo.intTelInfo = 66666;
//userInfo.strAddrInfo = "北京市";
//userInfo.strPasswordInfo = "yhx.123";
userInfo.strName = "张三";
userInfo.intAge = 23;
userInfo.strPsd = "yhx.123";
userInfo.intTel = 2324;
userInfo.strAddr = "北京市";
//将对象序列化json
DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(UserInfo));
//创建存储区为内存流
System.IO.MemoryStream ms = new MemoryStream();
//将json字符串写入内存流中
serializer.WriteObject(ms, userInfo);
System.IO.StreamReader reader = new StreamReader(ms);
ms.Position = 0;
string strRes = reader.ReadToEnd();
reader.Close();
ms.Close();
return strRes;
}
/// <summary>
/// 将json数据转换成实体类
/// </summary>
/// <returns></returns>
private static List<UserInfo> getObjectByJson(string jsonString)
{
// 实例化DataContractJsonSerializer对象，需要待序列化的对象类型
DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(List<UserInfo>));
//把Json传入内存流中保存
jsonString = "[" + jsonString + "]";
MemoryStream stream = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));
// 使用ReadObject方法反序列化成对象
object ob = serializer.ReadObject(stream);
List<UserInfo> ls = (List<UserInfo>)ob;
return ls;
}

/// <summary>
/// 在页面上显示转换为实体类数据
/// </summary>
private string disJsonInfo(List<UserInfo> us)
{
string strItem = "";
foreach(var item in us )
{
strItem += item.strName + ":" + item.strPsd + ":" + item.intAge + ":" + item.intTel + ":" + item.strAddr + "<br/>";
}
return strItem;
}

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