使用newtonsoft序列化和反序列化日期时间

Question

I have a class which contains the ocject DateTime .

public class Refuel 
{
    public DateTime DateTime { get; set; }
    public string Litre { get; set; }
}

When deserializing my text file I get an error.

Newtonsoft.Json.JsonSerializationException: Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List`1[OD_TankApp.Models.Refueling]' because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly.
To fix this error either change the JSON to a JSON array (e.g. [1,2,3]) or change the deserialized type so that it is a normal .NET type (e.g. not a primitive type like integer, not a collection type like an array or List<T>) that can be deserialized from a JSON object. JsonObjectAttribute can also be added to the type to force it to deserialize from a JSON object.
Path 'DateTime', line 1, position 12.

I tried already with Json settings but it didnt helped.

JsonSerializerSettings settings = new JsonSerializerSettings { DateFormatHandling = DateFormatHandling.MicrosoftDateFormat};

this is the json string:

"{\"DateTime\":\"2019-02-28T16:21:06.36845+01:00\",\"Litre\":\"23\"}}"

Answer 1

You are trying to deserialize a json string which represents a single object into a list/array of objects which will not work. Either deserialize it into a single object like this:

var obj = JsonConvert.DeserializeObject<Refuel>(json);

Or change your json string to contain a list of objects:

"[{\\"DateTime\\":\\"2019-02-28T16:21:06.36845+01:00\\",\\"Litre\\":\\"23\\"}]"

Now you can deserialize it like that:

var objArray = JsonConvert.DeserializeObject<Refuel[]>(json);

Answer 2

如果要反序列化数组，则需要确保（[]）的安全。

JsonConvert.DeserializeObject<Refuel[]>(json);