Question

我试图利用<代码>Automapper绘制这些特性的地图。

public class SourceClass
{
    public object emailNotification { get; set; }
}

public class DestinationClass
{
    public int emailNotificationId { get; set; }
    public string emailNotificationLookupName { get; set; }
}

当I debug it时,email Notification = ValueKind = 反对: “{“id”:3,“lookupName”:“Send Email inform”}"。

预期成果

emailNotificationId = 3
emailNotificationLookupName = "Send Email Notification"

这是我目前的制图代码,但我有这一汇编错误:。


public class SourceProfile : AutoMapper.Profile
{
    public SourceProfile()
    {
        CreateMap<SourceClass, DestinationClass>()     
            .ForMember(dest => dest.emailNotificationId, opt => opt.MapFrom(src =>
                src.emailNotification != null && src.emailNotification is JObject jObject ? jObject["id"].Value<int>() : 0))
            .ForMember(dest => dest.emailNotificationLookupName, opt => opt.MapFrom(src =>
                src.emailNotification != null && src.emailNotification is JObject jObject ? jObject["lookupName"].Value<string>() : null))
        ;
                        
    }
}

在尝试了永道的两种解决办法之后,我可以毫不错误地汇编,但我仍然无法绘制出价值图。


New screenshot

Answer 1


您可以使用<条码>作为<条码/代码>的操作员,以取代<条码>is,以解决这个问题:
CreateMap<SourceClass, DestinationClass>()     
    .ForMember(dest => dest.emailNotificationId, opt => opt.MapFrom(src =>
        src.emailNotification != null ? JObject.FromObject(src.emailNotification)["id"].Value<int>() : 0))
    .ForMember(dest => dest.emailNotificationLookupName, opt => opt.MapFrom(src =>
        src.emailNotification != null ? JObject.FromObject(src.emailNotification)["lookupName"].Value<string>() : null))

由于认证<代码> 电子邮件通知的逻辑不是null, 并转至 JObjectplica in multi place, You may consider migration in 在Map行动之后:

CreateMap<SourceClass, DestinationClass>()     
    .AfterMap((src, dest, context) =>
    {
        if (src.emailNotification != null)
        {
            JObject jObject = JObject.FromObject(src.emailNotification);
            dest.emailNotificationId = jObject["id"].Value<int>();
            dest.emailNotificationLookupName = jObject["lookupName"].Value<string>();
        }
    });

Answer 2

I found this article about Expression Trees that you might find interesting. It says that you cannot use the pattern matching is operator inside one of these. This answer from JonSkeet himself might be useful too, but summarazing, it is a feature that is not currently supported in Expression Trees (like the one you are passing as parameter to the MapFrom method).

希望会有助于

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