实体类和json互相转换

/// <summary>
/// 将实体类转换为json数据
/// </summary>
/// <returns></returns>
public string getJsonInfo()
{

BillPostModel model = new BillPostModel();
model.amount =;
model.cid ="";
model.id = "";
model.payment_date ="2017-09-09";
model.remark = "测试";
model.sample_id = "";
//将对象序列化json
DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(BillPostModel));    //注意这里是实体类 类名
//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, model);
System.IO.StreamReader reader = new StreamReader(ms);
ms.Position = ;
string strRes = reader.ReadToEnd();
reader.Close();
ms.Close();
return strRes;
}

/// <summary>
/// 把Json文本转为实体
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="input"></param>
/// <returns></returns>
public static T FromJSON<T>(string input)
{
try
{

 //{"IP":"58.215.186.139", "CPU":"0.0%", "AllMem":"256 G","RemainMem":"217.2 G","UserdMem":"38.8 G [ 15.15625% ]",  "download":"267.57 kbps"  ,"upload":"18.00 kbps" ,"runtime":"61-19-34" ,"OS":"Microsoft Windows NT 6.1.7601 Service Pack 1","Disk":"C:\RemainDisk：22.1G,AllDisk：50.0G|D:\RemainDisk：110.6G,AllDisk：182.3G|E:\RemainDisk：399.7G,AllDisk：837.7G|" ,"t":"2019-03-29 17:18:14"  ,"rundt":"2019-01-27 21:43:42"}
return JsonConvert.DeserializeObject<T>(input);
}
catch (Exception ex)
{
return default(T);
}
}