将委托传递为方法参数

使用 C# ref parameter modifier :

var handler = new SomeEventHandler(MyHandler);
Wire(ref myObject.SomeEventDelegate, handler);

private void Wire(ref Delegate eventDelegate, Delegate handler)
{
    // Pre validate the subscription.
    eventDelegate = Delegate.Combine(eventDelegate, handler);
    // Post actions (storing subscribed event handlers in a list)
}

还要注意,存在一些很好的语法结构(如c 2.0),用于分配和组合委托(请参见 this article 例如:

Wire(ref myObject.SomeEventDelegate, MyHandler);

private void Wire(ref Delegate eventDelegate, Delegate handler)
{
    // Pre validate the subscription.
    eventDelegate += handler;
    // Post actions (storing subscribed event handlers in a list)
}

有人向我指出 裁判 只适用于字段,而不适用于属性。对于属性,可以使用中间变量:

var tempDelegate = myObject.SomeEventDelegate;
Wire(ref tempDelegate, MyHandler);
myObject.SomeEventDelegate = tempDelegate;