C# 使用Utf8Json序列化/反序列化时指定历元时间日期格式

在使用utf8json进行序列化和反序列化期间，我找不到关于如何处理DateTimeOffset和TimeSpan的足够信息。我可以找到关于IJsonFormatter的信息，但找不到如何正确实现它

public class CustomDateTimeConverter : IJsonFormatter
{
    public CustomDateTimeConverter()
    {
       // convert DateTime to Unix Milliseconds for Serialzing
    }
}

我的示例类如下所示：

public MyClass()
{
 // This should be converted during serializing/deserializing  to Unix TimeStamp in Milliseconds  
  [JsonFormatter(typeof[CustomDateTimeConverter())]  
  public DateTimeOffSet? BeginDate { get; set; }

  // This should be converted to TotalMilliseconds
  public TimeSpan? Elapsed { get; set; } 
}

public MyClass()
{

  [IgnoreDataMember]
  // This field will be used internally
  public DateTimeOffSet? BeginDate { get; set; }


  [DataMember(Name = "beginDate")]
  // This will be used for serialzing/deserialising to Unix TimeStamp in Milliseconds 
  public long BeginDateEpoch
  {
    get { return ((DateTimeOffset)BeginDate.GetValueOrDefault()).ToUnixTimeMilliseconds(); }
    set { BeginDate= new DateTimeOffset(DateTimeOffset.FromUnixTimeMilliseconds(value).DateTime.ToLocalTime()); }
  }

  [IgnoreDataMember]
  public TimeSpan? Elapsed { get; set; } 

  [DataMember(Name = "elapsed")]
  public double ElapsedEpoch
  {
    get { return Elapsed.GetValueOrDefault().TotalMilliseconds;  }
    set { Elapsed = TimeSpan.FromMilliseconds(value); }
  }

}

我有一个将Datetime转换为本文中的EpochTimeStamp的函数：

我试图将[JsonFormatter（typeof[CustomDateTimeConverter（））]添加到datamember BeginDate，但需要正确实现它

public class CustomDateTimeConverter : IJsonFormatter
{
    public CustomDateTimeConverter()
    {
       // convert DateTime to Unix Milliseconds for Serialzing
    }
}

或者我走错了路？我怎样才能做到这一点

---

谢谢您的帮助！

我的解决方案在不使用IJsonFormatter的情况下扩展了我的类。 该类现在如下所示：

public MyClass()
{
 // This should be converted during serializing/deserializing  to Unix TimeStamp in Milliseconds  
  [JsonFormatter(typeof[CustomDateTimeConverter())]  
  public DateTimeOffSet? BeginDate { get; set; }

  // This should be converted to TotalMilliseconds
  public TimeSpan? Elapsed { get; set; } 
}

public MyClass()
{

  [IgnoreDataMember]
  // This field will be used internally
  public DateTimeOffSet? BeginDate { get; set; }


  [DataMember(Name = "beginDate")]
  // This will be used for serialzing/deserialising to Unix TimeStamp in Milliseconds 
  public long BeginDateEpoch
  {
    get { return ((DateTimeOffset)BeginDate.GetValueOrDefault()).ToUnixTimeMilliseconds(); }
    set { BeginDate= new DateTimeOffset(DateTimeOffset.FromUnixTimeMilliseconds(value).DateTime.ToLocalTime()); }
  }

  [IgnoreDataMember]
  public TimeSpan? Elapsed { get; set; } 

  [DataMember(Name = "elapsed")]
  public double ElapsedEpoch
  {
    get { return Elapsed.GetValueOrDefault().TotalMilliseconds;  }
    set { Elapsed = TimeSpan.FromMilliseconds(value); }
  }

}