Question

我有一个调用另一个类的类-新类具有我为其定义的事件。我已在我的调用类中订阅了事件，但我的调用类似乎无法获取EventArgs。我知道我必须在这里做些无知的事情，但是我不知道该怎么做。

我的代码在下面缩写。 WorkControl是主要进程，并调用MyProcess，该MyProcess执行一些代码并触发事件。

public class WorkControl
{
    public MyProcess myp;

    public WorkControl()
    {
            myp.InBoxShareDisconnected += OnShareFolderDisconnected();
        }

        private EventHandler OnShareFolderDisconnected<NetworkShareDisconnectedEventArgs>()
        {
          // How do I get my EventArgs from the event?
           throw new NotImplementedException();
        }

}

public class MyProcess
{
    public void MyDisconnectTrigger
    {
             NetworkShareDisconnectedEventArgs e = 
new NetworkShareDisconnectedEventArgs(path, timestamp, connected);

                OnInBoxShareDisconnected(e);
    }

        public event EventHandler<NetworkShareDisconnectedEventArgs> InBoxShareDisconnected;

        protected void OnInBoxShareDisconnected(NetworkShareDisconnectedEventArgs e)
        {
          //  InBoxShareDisconnected(this, e);
            InBoxShareDisconnected.SafeInvoke(this, e);
        }
}

Answer 1

您有几个问题。您的MyProcess类不应在构造函数中引发事件，并且MyWorker类需要具有MyProcess的实例才能将该事件附加到该事件。另一个问题是您需要正确声明事件处理程序。

让我们看看您的生产者MyProcess类的正确事件模式：

public class MyProcess
{
    public event EventHandler<NetworkShareDisconnectedEventArgs> InBoxShareDisconnected;

    public MyProcess()
    {
        //This doesn't really do anything, don't raise events here, nothing will be
        //subscribed yet, so nothing will get it.
    }

    //Guessing at the argument types here
    public void Disconnect(object path, DateTime timestamp, bool connected)
    {
        RaiseEvent(new NetworkShareDisconnectedEventArgs(path, timestamp, connected));
    }

    protected void RaiseEvent(NetworkShareDisconnectedEventArgs e)
    {
        InBoxShareDisconnected?.Invoke(this, e);
    }
}

现在我们可以看看您的消费者类别：

public class WorkControl
{
    private MyProcess _myProcess;

    public WorkControl(MyProcess myProcess)
    {
        _myProcess = myProcess;  //Need to actually set it to an object
        _myProcess.InBoxShareDisconnected += HandleDisconnected;
    }

    private void HandleDisconnected(object sender, NetworkShareDisconnectedEventArgs e)
    {
        //Here you can access all the properties of "e"
    }
}

因此，现在您可以使用使用者类中的事件，并可以访问NetworkShareDisconnectedEventArgs参数的所有属性。这是一个非常标准的事件生产者/消费者模型。

在调用类中获取EventArgs

1 个答案: