如何在现有按钮c#上放置新的事件句柄

Question

我想在现有按钮上添加新的事件句柄。我在表单中创建了9个按钮，希望在单击时显示每个名称，但不想手动显示每个按钮消息。

如何做到这一点？

Answer 1

您可以使用EventHandler的发送方属性来执行此操作。此示例使用winforms按钮：

SomeButtonClicked(object sender, EventArgs e)
{
     var button = sender as Button;
     MessageBox.Show(button.Name);
}

然后您可以将此事件添加到多个按钮，即：

button1.Click += new System.EventHandler(SomeButtonClicked);
button2.Click += new System.EventHandler(SomeButtonClicked);
button3.Click += new System.EventHandler(SomeButtonClicked);

Answer 2

您可以编写类似的代码

   private void MainForm_Load(object sender, EventArgs e) {
     ...
     // Assigning on click event, assuming that all your buttons are on the MainForm
     foreach (Control ctrl in Controls) {
        Button btn = ctrl as Button;
        if (!Object.ReferenceEquals(null, btn))
          btn.Click += onButtonClick;
     }
   ...
   // On click itself
   private void onButtonClick(Object sender, EventArgs e) {
     Button btn = sender as Button;
     String name = btn.Name; // <- Or whichever property of the button you want
   }