用层次结构继承模型

Question

我使用c＃（但不管没有）并具有以下模型：

public abstract class SuspensionRequestCreatedBaseDto
{
    public int RequestId { get; set; }
    public string DeviceIMEI { get; set; }
    public string DeviceName { get; set; }
}

public class SuspensionRequestCreatedExpirationTimeDto : SuspensionRequestCreatedBaseDto
{
    public DateTime? LastActive { get; set; }
    public DateTime ApprovePlannedDateTime { get; set; }
}

public class SuspensionRequestCreatedReachDataLimitDto : SuspensionRequestCreatedBaseDto
{
    public int DataUsedMb { get; set; }
}

我将这些类用于我的服务库，因此，有常见的DTO类，

但是对于一个UI项目，我需要具有以下逻辑：

public abstract class SuspensionRequestCreatedBaseDto
{
    public int RequestId { get; set; }
    public string DeviceIMEI { get; set; }
    public string DeviceName { get; set; }

    public virtual string PrepareEmailPart(string body)
    {
        // logic 1 (base logic)
    }
}

public class SuspensionRequestCreatedExpirationTimeDto : SuspensionRequestCreatedBaseDto
{
    public DateTime? LastActive { get; set; }
    public DateTime ApprovePlannedDateTime { get; set; }

    public override string PrepareEmailPart(string body)
    {
        // logic 2
    }
}

public class SuspensionRequestCreatedReachDataLimitDto : SuspensionRequestCreatedBaseDto
{
    public int DataUsedMb { get; set; }

    public override string PrepareEmailPart(string body)
    {
        // logic 3
    }
}

然后只需调用请求请求。但是我无法将这些特定的东西（UI事物）添加到我用于服务的核心库中。

我试图这样实施：

public class SuspensionRequestCreatedBaseModel
{
    public virtual SuspensionRequestCreatedBaseDto SuspensionRequest { get; set; }

    public virtual string PrepareEmailPart(string body)
    {
         // base logic
    }
}

public class SuspensionRequestCreatedExpirationTimeModel : SuspensionRequestCreatedBaseModel
{
    public override SuspensionRequestCreatedExpirationTimeDto SuspensionRequest {get; set;}

    public override string PrepareEmailPart(string body)
    {
        // logic 2
    }
}

但是我得到了

'suspensionRequestCreatedExpirationTimeModel.SuspensionRequest'： 类型必须是“悬挂QuestCreatedBasedto”才能匹配被覆盖的 成员 'suspensionRequestCreatedBaseModel.SuspensionRequest'

如何正确实施它，没有案例>案例 antipattern，而不将不必要的UI事物与核心进行混合？