Question

我按照这个例子在两个C＃项目之间创建了一个WCF接口：

https://dopeydev.com/wcf-interprocess-communication/

正如您在＆＃34; TestService.cs＆＃34;中看到的那样。代码，有这个函数的实现：

public void SendMessage(string message)
{
    MessageBox.Show(message);
}

实际上显示了服务器上收到的消息。我知道这个名字很混乱，但它与客户使用的名称相同。

我的目标是更改此功能，以便触发要在另一个类中使用的事件。

这就是我试图做的事情：

[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerSession)]
public class IServer : Interfaces.IService
{
    public void Connect()
    {
        Callback = OperationContext.Current.GetCallbackChannel<Interfaces.ICallbackService>();
    }

    public static Interfaces.ICallbackService Callback { get; set; }

    public void SendMessage(string message)
    {
        MessageReceivedEventArgs args = new MessageReceivedEventArgs();
        args.json = message;
        OnMessageReceived(this, args);
    }

    public event EventHandler<MessageReceivedEventArgs> MessageReceived;
    protected virtual void OnMessageReceived(object sender, MessageReceivedEventArgs e)
    {
        MessageReceived?.Invoke(this, e);
    }
}

public class MessageReceivedEventArgs : EventArgs
{
    public string json;
}

然后在我的另一堂课：

class Comm 
{
    IServer m_server = new IServer();

    public Engine()
    {
        var host = new ServiceHost(typeof(IServer), new Uri("net.pipe://localhost"));
        host.AddServiceEndpoint(typeof(IService), new NetNamedPipeBinding(), "ipc");
        host.Open();

        m_server.MessageReceived += Server_MessageReceived;
    }

    private void Server_MessageReceived(object sender, MessageReceivedEventArgs e)
    {
        // this event handler is never executed!
    }
}

据我了解，问题是我在添加了事件处理程序的情况下创建了IServer类的新实例，但实际使用ServiceHost代码的IServer是另一个实例

我错了吗？我需要检索ServiceHost使用的实例以使事件有效吗？

Answer 1

ServiceHost有an overload where you can provide your own instance for the service：

var host = new ServiceHost(m_server, new Uri("net.pipe://localhost"));

此外，您应该绑定事件之前启动服务，否则您可能会错过请求：

m_server.MessageReceived += Server_MessageReceived;
host.Open();

来自ServiceHost接口的Fire事件

1 个答案: