在 json 和 Web api 之间保持 C# datetime 本地时间？

Question

当我在 json 对象中有数据时间时遇到问题，它会将其转换为 C# 中的 UTC 时区 dateTime 只是想问如何保持本地时间？我可以在 web.config 文件或 geter 或 setter 中设置时区属性吗？我必须可以反对有日期和时间？ 这是类示例？

public class Patient
{
    public long RecordId { get; set; }
    public string Username { get; set; }
    public DateTime Date 
      {
          get; 
          set;
      }
    public bool Deleted { get; set; }
    public string ModifiedBy { get; set; }
    public DateTime ModifiedOn { get; set; }
    public string CreatedBy { get; set; }
    public DateTime CreatedOn { get; set; }
}

更新我尝试使用 getter 和 setter 来修复我有这个异常{Cannot evaluate expression because the current thread is in a stack overflow state.}

[System.Web.Http.Route("api/postpatientform")]
public HttpResponseMessage PostPatientForm(PatientViewModel form)
{
    using (var db = new AthenaContext())
    {
        try
        {
            var form2 = Mapper.Map<Patient>(form);
            db.Patient.Add(form2);
            db.SaveChanges();

            var newId = form2.RecordId;
            foreach (var activity in form.PatientActivities)
            {
                activity.PatientId = newId;

                db.NonPatientActivities.Add(Mapper.Map<PatientActivity>(activity));
            }
            db.SaveChanges();

        }
        catch (DbEntityValidationException e)
        {
            foreach (var eve in e.EntityValidationErrors)
            {
                Debug.WriteLine("Entity of type \"{0}\" in state \"{1}\" has the following validation errors:",
                    eve.Entry.Entity.GetType().Name, eve.Entry.State);
                foreach (var ve in eve.ValidationErrors)
                {
                    Debug.WriteLine("- Property: \"{0}\", Error: \"{1}\"",
                        ve.PropertyName, ve.ErrorMessage);
                }
            }
            throw;
        }
    }

    return Request.CreateResponse<Patient>(HttpStatusCode.Created, null);
}

Answer 1

您可以更改您的序列化程序设置以使用 JSON.net 序列化程序：

GlobalConfiguration.Configuration.Formatters.JsonFormatter.SerializerSettings = 
    new JsonSerializerSettings
    {
        DateFormatHandling = DateFormatHandling.IsoDateFormat,
        DateTimeZoneHandling = DateTimeZoneHandling.Unspecified,
    };

您还可以选择多种日期格式：DateTimeZoneHandling

/// <summary>
/// Specifies how to treat the time value when converting between string and <see cref="DateTime"/>.
/// </summary>
public enum DateTimeZoneHandling
{
    /// <summary>
    /// Treat as local time. If the <see cref="DateTime"/> object represents a Coordinated Universal Time (UTC), it is converted to the local time.
    /// </summary>
    Local = 0,

    /// <summary>
    /// Treat as a UTC. If the <see cref="DateTime"/> object represents a local time, it is converted to a UTC.
    /// </summary>
    Utc = 1,

    /// <summary>
    /// Treat as a local time if a <see cref="DateTime"/> is being converted to a string.
    /// If a string is being converted to <see cref="DateTime"/>, convert to a local time if a time zone is specified.
    /// </summary>
    Unspecified = 2,

    /// <summary>
    /// Time zone information should be preserved when converting.
    /// </summary>
    RoundtripKind = 3
}

Answer 2

您可以对此进行配置。见：http://www.newtonsoft.com/json/help/html/SerializeDateTimeZoneHandling.htm

这是一个例子：

public void Config(IAppBuilder app)
{
    var config = new HttpConfiguration();

    var jsonFormatter = config.Formatters.OfType<JsonMediaTypeFormatter>().First();
    jsonFormatter.SerializerSettings.DateTimeZoneHandling = DateTimeZoneHandling.Local;

    app.UseWebApi(config);
}

Answer 3

您可以使用 TimeZoneInfo.ConvertTime 转换为所需的时区。

签出此方法： https://msdn.microsoft.com/en-us/library/bb382770(v=vs.110).aspx