NService Bus＆＃x27; Publish（）＆＃x27;基本界面不发送混凝土子类属性

发布于 2025-01-21 03:12:33 字数 1247 浏览 0 评论 0原文

我使用界面使用nservicebus将消息发送给处理程序。以下是接口：

interface IDeliveryTarget
{
        public DeliveryType DeliveryType { get; }
        public string DocumentId { get; set; }
}

子类电子邮件和传真：

class EmailTarget : IDeliveryTarget
{
    public DeliveryType DeliveryType => DeliveryType.Email;
    public int DocumentId {get;set;}
    public string MessageBody { get; set; }
    public string[] Recepients { get; set; }
    public string Subject { get; set; }
}
class FaxTarget : IDeliveryTarget
{
    public DeliveryType DeliveryType => DeliveryType.Email;
    public int DocumentId {get;set;}
    public string FaxNumber { get; set; }
    public string FaxUserName { get; set; }
    public string Organization { get; set; }
    public string Subject { get; set; }
}

我发送列表＆lt; ideliveryTarget＆gt;从处理程序如下：

context.Publish(new UploadSuccess
{
   DeliveryTargets = new List<IDeliveryTarget>()
}

此列表有许多电子邮件和传真输入。

如下所示，在另一个传奇中处理：

public async Task Handle(UploadSuccess message, IMessageHandlerContext context)

但是，在此处，上载消息仅具有在ideliverytarget接口中定义的属性，但是电子邮件和传真特定的属性却缺少。

除了电子邮件和传真属性以外，我要出席进一步处理。请指导。

原文

I am using an interface to send message to a handler using NServicebus. Below is the interface:

interface IDeliveryTarget
{
        public DeliveryType DeliveryType { get; }
        public string DocumentId { get; set; }
}

Child Classes Email and Fax:

class EmailTarget : IDeliveryTarget
{
    public DeliveryType DeliveryType => DeliveryType.Email;
    public int DocumentId {get;set;}
    public string MessageBody { get; set; }
    public string[] Recepients { get; set; }
    public string Subject { get; set; }
}
class FaxTarget : IDeliveryTarget
{
    public DeliveryType DeliveryType => DeliveryType.Email;
    public int DocumentId {get;set;}
    public string FaxNumber { get; set; }
    public string FaxUserName { get; set; }
    public string Organization { get; set; }
    public string Subject { get; set; }
}

I send List<IDeliveryTarget> from handler as below:

context.Publish(new UploadSuccess
{
   DeliveryTargets = new List<IDeliveryTarget>()
}

This list has many Email and Fax inputs.

Handled in another Saga as below:

public async Task Handle(UploadSuccess message, IMessageHandlerContext context)

But here the UploadSuccess message has only properties defined in IDeliveryTarget interface but Email and Fax specific properties are missing.

I except Email and Fax properties to be present for further processing.
Please guide.

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南城追梦 2025-01-28 03:12:33

@MindSwipe 提到的另一种解决方案是为每个具体类型的事件提供专用属性，即：

context.Publish(new UploadSuccess
{
   EmailTargets = new List<EmailTarget>(),
   FaxTargest = new List<FaxTarget>();
}

这将允许您在处理程序中访问具体类型的属性，而无需进行强制转换。

An alternative solution to what @MindSwipe mentioned is to have dedicated properties on the event for each of the concrete types ie.:

context.Publish(new UploadSuccess
{
   EmailTargets = new List<EmailTarget>(),
   FaxTargest = new List<FaxTarget>();
}

This will allow you to access concrete types' properties in a handler without the need for casting.

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别再吹冷风 2025-01-28 03:12:33

您需要将 DeliveryTarget 中的项目转换为接口的具体实现，这些属性仍然存在，它们只是对智能感知隐藏，因为您有一个 IDeliveryTarget 类型的变量> 它没有声明您想要的那些属性。

做这样的事情：

public async Task Handle(UploadSuccess message, IMessageHandlerContext ctx)
{
    foreach (IDeliveryTarget target in message.DeliveryTargets)
    {
        if (target is EmailTarget emailTarget)
        {
            Console.WriteLine($"Got email target with subject {emailTarget.Subject}");
        }
        else if ( ... )
    }
}

这对于很多实现来说变得很麻烦，我建议您向 IDeliveryTarget 接口添加像 Handle 这样的方法，并使用多态性将其缩短为：

public async Task Handle(UploadSuccess message, IMessageHandlerContext ctx)
{
    foreach (IDeliveryTarget target in message.DeliveryTargets)
        await target.Handle();
}

You need to cast the items in DeliveryTarget to a concrete implementation of your interface, those properties are still there, they're just hidden to intellisense because you have a variable of type IDeliveryTarget which doesn't declare those properties you want.

Do something like this:

public async Task Handle(UploadSuccess message, IMessageHandlerContext ctx)
{
    foreach (IDeliveryTarget target in message.DeliveryTargets)
    {
        if (target is EmailTarget emailTarget)
        {
            Console.WriteLine(quot;Got email target with subject {emailTarget.Subject}");
        }
        else if ( ... )
    }
}

This becomes cumbersome with lots of implementations, I'd suggest you add a method like Handle to the IDeliveryTarget interface and use polymorphism to shorten that to:

public async Task Handle(UploadSuccess message, IMessageHandlerContext ctx)
{
    foreach (IDeliveryTarget target in message.DeliveryTargets)
        await target.Handle();
}

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