[英]Remoting with delegates
在我們的一個應用程序中,我們有一個(現有)接口,如下所示:
public interface INotify
{
void RegisterNotification(Action<int, string> notification);
}
現在,我們想使用IpcChannels為實現此接口的對象實現一個“遠程處理層”。
我閱讀了許多有關遠程處理,委托和事件的文章,但是無法使測試場景正常工作。 大多數示例使用直接在服務器類中實現的事件,而不是參數中的委托。
有人知道一個有效的例子或給我提示嗎?
通過創建一個“EventSink的”,用表達lambda表達式重新創建的委托成功了 。 似乎有點復雜,但可以正常工作...
EventSink:
public class GenericEventSink : MarshalByRefObject
{
public event GenericDelegate MessageReceived;
public Type OriginalType { get; }
public GenericEventSink(Delegate original)
{
OriginalType = original.GetType();
MessageReceived += objects =>
{
try
{
return original.DynamicInvoke(objects);
}
catch (Exception ex)
{
return null;
}
};
}
public override object InitializeLifetimeService()
{
return null;
}
public object OnMessageReceived0()
{
return MessageReceived?.Invoke();
}
public object OnMessageReceived1(object o1)
{
return MessageReceived?.Invoke(o1);
}
public object OnMessageReceived2(object o1, object o2)
{
return MessageReceived?.Invoke(o1, o2);
}
public object OnMessageReceived3(object o1, object o2, object o3)
{
return MessageReceived?.Invoke(o1, o2, o3);
}
}
...以及重新創建要調用的委托的方法:
private object UnmarshalDelegate(GenericEventSink generic)
{
var pars = generic.OriginalType.GenericTypeArguments.Select(Expression.Parameter).ToArray();
// create the call
var method = generic.GetType().GetMethod("OnMessageReceived" + pars.Length);
var call = Expression.Call(Expression.Constant(generic), method, pars.Select(p => Expression.Convert(p, typeof(object))));
return Expression.Lambda(generic.OriginalType, call, pars).Compile();
}
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