C# 后端回传的Json数据转换为实体对象转换器JsonConverter的使用

public class JsonDateTimeConverter : JsonConverter<DateTime?>
{
    private readonly string _dateTimeFormat;

    public JsonDateTimeConverter(string dateTimeFormat)
    {
        _dateTimeFormat = dateTimeFormat;
    }

    public override void WriteJson(JsonWriter writer, DateTime? value, JsonSerializer serializer)
    {
        switch (value)
        {
            case null:
                return;
            case { } dateTime:
                writer.WriteValue(dateTime.ToString(_dateTimeFormat));
                break;
        }
    }

    public override DateTime? ReadJson(JsonReader reader, Type objectType, DateTime? existingValue, bool hasExistingValue,
        JsonSerializer serializer)
    {
        if (reader.Value == null) return null;
        return DateTime.Parse(reader.Value.ToString());
    }
}

[JsonProperty("day"), JsonConverter(typeof(JsonDateTimeConverter), "yyyy-MM-dd HH:mm:ss")]
public DateTime? Day { get; set; }