我可以帮您进行翻译。以下是需要翻译的内容:
这会触发事件,但是设置 e.Message 和 e.Function 似乎没有设置值。我做错了什么吗?
我有一个类,会触发一个事件。我希望订阅者能够修改传递给 EventArgs 的值。
在触发事件的类中:
class Factory
{
public event EventHandler<MessageReceivedEventArgs> MessageReceived;
private IServerLib _myObject;
public void Connect()
{
_myObject = new ServerLib();
_myObject.AddMessageReceivedHandler((short terminal, ref string message, ref short functionNo) =>
{
MessageReceivedEventArgs args = new MessageReceivedEventArgs { Terminal = terminal, Message = message, FunctionNo = functionNo };
MessageReceivedEvent(ref args);
});
}
private void MessageReceivedEvent(ref MessageReceivedEventArgs args)
{
EventHandler<MessageReceivedEventArgs> handler = MessageReceived;
if (handler != null)
{
handler(this, args);
}
}
public class MessageReceivedEventArgs : EventArgs
{
public short Terminal { get; set; }
public string Message { get; set; }
public short FunctionNo { get; set; }
}
}
interface IServerLib
{
void AddMessageReceivedHandler(MessageReceivedEventHandler action);
}
public delegate void MessageReceivedEventHandler(short terminal, ref string message, ref short functionNo);
订阅者(这里是VB)的样子如下:
Dim WithEvents _va As MyAssembly.MyClass
Private Sub _va_MessageReceived(sender As Object, e As Factory.MessageReceivedEventArgs) Handles _va.MessageReceived
Debug.WriteLine($"Message: {e.Message} Terminal: {e.Terminal} Function: {e.FunctionNo}")
If e.Message = "1" Then
e.Message = ""
e.FunctionNo = 0
Debug.WriteLine("Cancelled")
End If
End Sub
这会触发事件,但是设置 e.Message 和 e.Function 似乎没有设置值。我做错了什么吗?
handler(this, args);
,其中args
是一个实例。 - Matt Wilko(short x, ref string y, ref short z) =>
不被允许,所以这段代码似乎有缺陷。) - Patrick HofmanAddMessageReceivedHandler
吗?它当然会获取一个委托... - Patrick Hofman