Question

我有一个用户控件，它是一个标签和一个文本框。此控件将以表单形式动态创建。我想使用删除键按下删除此控件.Click事件用于关注用于触发keydown事件的控件和按键方法。这是我的代码

 private void usereditFieldControl_Click(object sender, EventArgs e)
    {            
        EditFieldControl editFieldControl = (EditFieldControl)sender;           
        editFieldControl.KeyDown += new KeyEventHandler(Key_pressed);
    }
private void Key_pressed(object sender, KeyEventArgs e)
    {
        EditFieldControl editFieldControl = (EditFieldControl)sender;
            if (e.KeyCode == Keys.Delete)
            {
                editFieldControl.Dispose();                    
            }         
    }

Answer 1

您可以使用以下代码。 “sender”可以转换为更通用的“Control”类：

private void textBox1_KeyDown(object sender, KeyEventArgs e) { 
    if (e.KeyCode == Keys.Delete) {
        Control ctl = (Control)sender; 
        ctl.Dispose(); 
        this.Controls.Remove(ctl); 
    } 
}

如果您的控件是在运行时以动态方式创建的，请不要忘记向KeyDown事件添加处理程序，如下所示：

this.textBox1.KeyDown += new System.Windows.Forms.KeyEventHandler(this.textBox1_KeyDown);

Answer 2

 private void usereditFieldControl_Click(object sender, EventArgs e)
    {            
        EditFieldControl editFieldControl = (EditFieldControl)sender;           
        editFieldControl.KeyDown += new KeyEventHandler(Key_pressed);
    }
private void Key_pressed(object sender, KeyEventArgs e)
    {
        EditFieldControl editFieldControl = (EditFieldControl)sender;
            if (e.KeyCode == Keys.Delete)
            {
                //Find control
                 for (int i = 0; i < editFieldControl.Parent.Controls.Count(); i++) {
                 if (editFieldControl.Parent.Controls[i].Name == editFieldControl.Name) {
                 //Unhook events to prevent memory leaks
               editFieldControl.KeyDown -= new KeyEventHandler(Key_pressed);
                 //Remove control from collection 
                editFieldControl.Parent.Controls.RemoveAt[i];
                 break;
                 }         
                 }
      //repaint 
      this.Invalidate();
       }
    }

未经测试，写在iPhone上

如何通过按键事件删除用户控件

2 个答案: