如何使单个事件处理程序处理所有Button.Click事件？ [英] How can I make a single event handler handle ALL Button.Click events?

问题描述

在我的程序中，我有9个按钮，我有9个单独的事件处理程序，尽管每个事件处理程序中的代码是相同的。改变所有这些代码证明是非常繁琐的。是否可以制作一个Button.Click事件处理程序来处理所有按钮的Button.Click事件？

解决方案

您可以修改VS生成的事件代码上的句柄子句，以便它可以处理多个控件的相同事件。在大多数情况下，有人可能希望将大部分（而不是全部）按钮点击一次。更改Handles子句：

  Private Sub Button3_Click（作为对象的发件人，作为EventArgs）Handles Button1.Click，
 Button3.Click，Button4.Click ... 
'只需添加额外的额外点击
 
'，您将需要检查发件人以确定哪个被点击
 
'你的代码这里
 End Sub 
  

这也可以动态完成，例如在Load事件（或以前）中创建并添加到表单中的控件：

  Private Sub Form1_Load （发件人As Object，e As EventArgs）处理MyBase.Load 
 AddHandler Button1.Click，AddressOf AllButtonsClick 
 AddHandler Button2.Click，AddressOf AllButtonsClick 
 AddHandler Button3.Click，AddressOf AllButtonsClick 
 
 End Sub 
  

要将所有按钮切换到同一个事件，你可以循环通过控制集合n（使用Linq）：

 为每个b按钮在XXXXX.Controls.OfType（Of Button）
 AddHandler b.Click，AddressOf MyClickHandler 
 Next 
  

其中 XXXXX 可能是我或面板，分组框等 - 无论按钮在哪里。

In my program, I have 9 buttons, and I have 9 separate event handlers for each of them, despite the fact that the code in each event handler is the same. It is proving to be very tedious to change the code for all of them. Is it possible to make a single Button.Click event handler that handles the Button.Click events for all of my buttons?

解决方案

You can modify the Handles clause on the VS generated event code so that it can process the same event for multiple controls. In most cases, someone might want to funnel most, but not all, button clicks to one procedure. To change the Handles clause:

Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button1.Click, 
                 Button3.Click, Button4.Click ...
    ' just add the extra clicks for the additional ones

    ' you will need to examine "Sender" to determine which was clicked

    ' your code here
End Sub

This can also be done dynamically, such as for controls which are created and added to a form in the Load event (or where ever):

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    AddHandler Button1.Click, AddressOf AllButtonsClick
    AddHandler Button2.Click, AddressOf AllButtonsClick
    AddHandler Button3.Click, AddressOf AllButtonsClick

End Sub

To literately wire all buttons to the same event, you can loop thru the controls collection (uses Linq):

For Each b As Button In XXXXX.Controls.OfType(Of Button)
     AddHandler b.Click, AddressOf MyClickHandler
Next

Where XXXXX might be Me or a panel, groupbox etc - wherever the buttons are.

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