C＃从多个文本框中检测KeyPress事件中的文本框

Question

I have 5 textBoxes which access the same KeyPressEvent() How do I detect from which textBox Currently key is Pressed ?

 private void textBox_Department_KeyPress(object sender, KeyPressEventArgs e)
    {

       e.Handled = !(Char.IsLetter(e.KeyChar) | e.KeyChar == (char)Keys.Back | e.KeyChar==(char)Keys.Space);
    }

Answer 1

在事件签名中， object sender是调用KeyPress事件的对象（在您的情况下为TextBox）。

Answer 2

You could use the Tag property or even use x:Name and check if sender is equal to it.

For example, if you were to use tag, you could do this to your TextBox es.

<TextBox Tag="textBox1"../>

then in your code, you can cast sender to TextBox and check if it's tag is equal to whatever you want.

var textBox = (TextBox)sender;
if(textBox.Tag == "textBox1"){}

Or even better, check the sender itself:

var textBox = (TextBox)sender;
if(textBox == myTextBoxNameInXName){}