ASP.NET Web API：DateTime绑定在json主体中不起作用

Question

For DateTime type, if I have a DateTime property inside a class then I try to model bind that class with HTTP post json body, the DateTime property does not get bound, how so? But if I use parameter binding, it's working fine. So below code works

[Route("v1/taxiqi")]
[HttpPost]
public object UpdateTaxiQI(string status, DateTime updateTime)
{
    ...
}

But not for below code

[Route("v1/taxiqi")]
[HttpPost]
public object UpdateTaxiQI(TaxiQI taxiQI)
{
    ...
}
public class TaxiQI
{
    public string Status;
    public DateTime UpdateTime;
}

I am using the latest ASP.NET Web API. Fields are working as it is working on my other API, besides, Status field is successfully bound. And I already tried properties, same result.

Sorry, I found out the root cause, it is caused by our code base is using a custom DateTimeConverter for JSON.NET and it expects a JavaScript style ticks instead of a date string

Answer 1

Your TaxiQI class is incorrect.
The JSON works with public properties not public fields. Change your class to this:

public class TaxiQI
{
    public string Status { get; set; }
    public DateTime UpdateTime  { get; set; }
}

Answer 2

In addition to Svek's answer, it may be wiser to use a Nullable<DateTime> or DateTime? instead. Null values are an intrinsic possibility whenever you deserialize data.

Answer 3

我发现了根本原因，很糟糕，这是由于我们的代码库对JSON.NET使用了自定义DateTimeConverter引起的，并且它期望使用JavaScript样式标记而不是日期字符串