WCF 事件声明 [英] WCF Event Declaration

问题描述

我看到 WCF 不直接使用事件，而是使用 OneWay 委托调用，但有人可以向我展示一个简单的示例来说明如何执行此操作吗?

I see that WCF doesn't directly use events and instead uses OneWay delegate calls, but can someone show me a simple example on how to do this?

这是我现在的设置:

    [OperationContract(IsOneWay = true)]
    void OnGetMapStoryboardsComplete(object sender, List<Storyboard> results);

推荐答案

假设您的回调协定接口名为 IMyServiceCallback，您的服务将在想要引发事件时执行以下代码:

Assuming your callback contract interface is called IMyServiceCallback, your service would execute the following code when it wanted to raise the event:

IMyServiceCallback callback = OperationContext.Current.GetCallbackChannel<IMyServiceCallback>();
callback.OnGetMapStoryboardsComplete(...);

我发现这篇文章很有帮助.它描述了一个瞬态事件系统和一个持久事件系统，其中任何一个都应满足 IMO 的任何和所有事件场景.

I found this article very helpful. It describes a transient event system and a persisted event system, either of which should satisfy any and all event scenarios, IMO.

HTH

设置回调合约:

interface IMyServiceCallback
{
    [OperationContract(IsOneWay = true)]
    void OnGetMapStoryboardsComplete(object sender, List<Storyboard>);
}

然后你需要在你的服务合同上指明它正在使用这个回调:

Then you need to indicate on your service contract that it is using this callback:

[ServiceContract(CallbackContract = typeof(IMyServiceCallback))]
interface IMyService
{
    // ...
}

完成此操作并实施服务后，请创建对服务的引用.然后客户端必须包含一个实现 IMyServiceCallback 的类:

Once you have done that and implemented your service, create a reference to the service. The client will then have to include a class that implements IMyServiceCallback:

class EventHandler : IMyServiceCallback
{
    public void OnGetMapStoryBoardsComplete(object sender, List<Storyboard>)
    {
        // Do whatever needs to be done when the event is raised.
    }
}

当您从客户端连接到服务时，您需要将一个 InstanceContext 传递给它，该InstanceContext 使用对将处理事件的对象的引用构建:

When you connect from the client to the service you need to pass it an InstanceContext built with a reference to the object that will handle the events:

EventHandler eventHandler = new EventHandler();
MyServiceClient client = new MyServiceClient(new InstanceContext(eventHandler));

有意义吗?

这篇关于WCF 事件声明的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！