WinForms/.NET：如何获取附加到事件的事件处理程序？

发布于 2024-12-16 18:45:41 字数 411 浏览 1 评论 0原文

如何将事件处理程序附加到事件？

伪代码，例如：

public static EventHandler GetChangeUICuesEventHandler(Control SomeControl)
{
   EventHandler changeUICuesEventHandler = SomeControl.ChangeUICues;
   return changeUICuesEventHandler
}

示例用法（伪代码）：

Control control = GetControlByName(Console.ReadLine());
button1.ChangeUICues += GetChangeUICuesEventHandler(control);

原文

How can i get the event handler attached to an event?

pseudocode, for example's sake:

public static EventHandler GetChangeUICuesEventHandler(Control SomeControl)
{
   EventHandler changeUICuesEventHandler = SomeControl.ChangeUICues;
   return changeUICuesEventHandler
}

Sample usage (pseudo-code):

Control control = GetControlByName(Console.ReadLine());
button1.ChangeUICues += GetChangeUICuesEventHandler(control);

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岁月蹉跎了容颜 2024-12-23 18:45:41

我提供以下内容作为替代路径而不是直接答案...所以这里...

您可以通过确保您的控件已附加事件处理程序（在本例中为参数someControl，而是实现一个定义附加处理程序的接口。例如：

public interface ChangUICuesHandler
{
    void OnChangeUICues(object sender, EventArgs e);
}

那么你可以像这样使用它：

Control control = GetControlByName(Console.ReadLine());
if (!(control is ChangeUICuesHandler))
{
    throw new Exception("Input Control does not implement the interface");
}
var handlerControl = control as ChangeUICuesHandler;
button.ChangeUICues += handler.OnChangeUICues;

I offer up the following as an alternative path rather than a direct answer... So here goes...

Can you approach this a little differently perhaps by ensuring that your control with the event handler already attached, in this case the parameter someControl, instead implements an interface that defines the attached handler. For example:

public interface ChangUICuesHandler
{
    void OnChangeUICues(object sender, EventArgs e);
}

Then you could use it like so:

Control control = GetControlByName(Console.ReadLine());
if (!(control is ChangeUICuesHandler))
{
    throw new Exception("Input Control does not implement the interface");
}
var handlerControl = control as ChangeUICuesHandler;
button.ChangeUICues += handler.OnChangeUICues;

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