是否可以在CheckedChanged事件参数中声明关键事件参数 [英] Is it Possible to declare Key Event Args in CheckedChanged Event Args

问题描述

你好任何人都可以帮忙。



我有 CheckBox 和 TextBox 在Windows窗体中，我想如果我做（ CheckBox.checked == false ）和 TextBox.Text 不是null，那么我想要 TextBox.clear（）然后我想要 TextBox Key.Enter eventargs，然后 TextBox.Enable == false 。



这是代码

Hello can any one help.

I have CheckBox and TextBox in Windows Forms, I would like to have if i make (CheckBox.checked==false) and TextBox.Text is not null, then i would like to make TextBox.clear() and next step I would like TextBox Key.Enter eventargs, then TextBox.Enable==false.

Here is the code

private void checkbox_CheckedChanged(object sender, EventArgs e)
          {
              if (checkbox.Checked == true)
              {
                  this.textBox1.Enabled = true;
              }

               if (checkbox.Checked == false)
              {
                  textBox1.Clear();

              // here i want textBox1.KeyEnterEventArgs "Enter" key pressed ..........

                  this.textBox1.Enabled = false;
              }

          }

是否可以这样做，谢谢提前

Is it possible to do this please, thanks in advance

推荐答案

不要模拟按键。如果它会执行任何操作，那么无论如何都会附加一个事件处理程序。直接调用该方法而不是让事件调用它。





评论中有两个独立的错误：



1. e.KeyCode = Keys.Enter;

是不可能的，因为< a href =http://msdn.microsoft.com/en-us/library/system.windows.forms.keyeventargs.keycode.aspx> e.KeyCode [ ^ ]是只读的。这样做你想要达到什么目的？



2. textBox_KeyDown（发件人，e）;

不起作用，因为你的 e 的类型是 EventArgs [ ^ ]，但您调用的方法需要 KeyEventArgs [ ^ ]作为第二个参数。



这就是你可以这样做的方法：

Don''t simulate pressing of a key. If it will do anything, you have an event handler attached anyway. Call that method directly instead of making the event call it.


There are two independent errors in your comment:

1. e.KeyCode = Keys.Enter;
is not possible since e.KeyCode[^] is readonly. What do you want to achieve by doing this?

2. textBox_KeyDown(sender,e);
doesn''t work because here your e is of type EventArgs[^], but the method you''re calling expects a KeyEventArgs[^] as second parameter.

This is how you could get that to work:

private void MethodNameDescribingTheActionToTake()
{
    // Do whatever needs to be done.
}

private void textBox1_KeyDown(object sender, KeyEventArgs e)
{
    MethodNameDescribingTheActionToTake();
}

private void checkbox_CheckedChanged(object sender, EventArgs e)
{
    if (checkbox.Checked == true)
    {
        this.textBox1.Enabled = true;
    }

    if (checkbox.Checked == false)
    {
        textBox1.Clear();

        MethodNameDescribingTheActionToTake();

        this.textBox1.Enabled = false;
    }
}

[/编辑]

这篇关于是否可以在CheckedChanged事件参数中声明关键事件参数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！