C# 使用事件处理程序与覆盖事件触发方法
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Using event handlers vs overriding event-firing methods
提问by Jeremy
I am creating a subclass of Button and would like to add custom functionality to some of its events such as OnClick. Which is the more desirable way to do it? Do I override OnClick:
我正在创建 Button 的子类，并希望向其某些事件（例如 OnClick）添加自定义功能。哪种方法更理想？我是否覆盖 OnClick：
protected override void OnClick(EventArgs e)
{
base.OnClick(e);
doStuff();
}
or should I instead link up the OnClick event to an event handler defined in my Button subclass through the designer?
或者我应该通过设计器将 OnClick 事件链接到我的 Button 子类中定义的事件处理程序？
class ButtonSubclass
{
public ButtonSubclass() : base()
{
InitializeComponent();
}
private void InitializeComponent()
{
this.Click += new System.EventHandler(this.ButtonSubclass_Click);
}
}
Edit: I added minor visual changes (that may pass as rudimentary skinning) but most of the changes are in event handlers that I don't want to re-implement (copy-paste) on every form that reuses it.
编辑：我添加了微小的视觉变化（可能作为基本的皮肤传递），但大多数变化都在事件处理程序中，我不想在每个重复使用它的表单上重新实现（复制粘贴）。
采纳答案by Jon Skeet
If you're genuinely specializing the button, it makes sense to override OnClick. If you're only actuallychanging what happens when a button is clicked, I wouldn't subclass Buttonin the first place - I'd justadd event handlers.
如果您真的是专门设计按钮，则覆盖OnClick. 如果您只是实际更改单击按钮时发生的情况，则我不会Button首先进行子类化- 我只会添加事件处理程序。
EDIT: Just to give a bit more of an idea - if you want to add similar event handlers for multiple buttons, it's easy enough to write a utility method to do that, and call it from multiple places. It doesn't require actual subclassing. That's not to say subclass isdefinitely wrong in your case, of course - just giving you extra options :)
编辑：只是为了提供更多的想法 - 如果您想为多个按钮添加类似的事件处理程序，编写一个实用程序方法来做到这一点很容易，并从多个地方调用它。它不需要实际的子类化。当然，这并不是说子类在您的情况下绝对是错误的 - 只是给您额外的选择:)
回答by Jakob Christensen
Always override OnClick when inheriting. It gives you better performance.
继承时始终覆盖 OnClick。它为您提供更好的性能。
回答by Francis Gilbert
For a button click, I'd keep it as a method for reading. But I guess it is a personal preference thing. I'd be interested to see what the concensus is.
对于按钮单击，我将其保留为一种阅读方法。但我想这是个人喜好的事情。我很想知道共识是什么。
回答by Michael Yutsis
Actually, there is one advantage of attaching an event handler over overriding a method. Your event handler is private, while your overridden method has to be protectedwith a predefined name. If you use obfuscating/encrypting tools to protect your application, your code is more exposed when it's protected overridethan when private.
实际上，附加事件处理程序覆盖覆盖方法有一个优点。您的事件处理程序是private，而您的重写方法必须使用预定义的名称进行保护。如果您使用混淆/加密工具来保护您的应用程序，那么您的代码protected override在private.
