What is the KeyCode for “,”(comma) and “.”(dot) in .NET?

问题

In my KeyDown EventHandler I need to know what is the KeyCode for "," and ".".

I can't find them thats why I ask. Thanks!

回答1:

A key and a character are not the same thing. The keyboard layout transforms between them, and that transform isn't trivial. Probably you're doing the wrong thing when using KeyDown. If you want to know which character a user entered you should use KeyPress, which gives the the already translated character.

For example Keys.Decimal is a key on the numpad that corresponds to . on the US layout, and , on the German layout. Keys.Oemcomma and OemPeriod are likely , and . belows the letters. But on other layouts that may be different.

回答2:

Oemcomma and OemPeriod look like good candidates.

Look at the Keys enumeration on MSDN.

回答3:

I did this:

1. Created a WinForm project with a single textbox.
2. Added the keydown event handler.
3. Put a break point in it
4. Got this:

回答4:

Check out the decimal value, that's your key code.

http://www.asciitable.com/

回答5:

Use Keys.Oemcomma and Keys.OemPeriod

回答6:

Have you tried this "."c

A float filter:

Select Case e.KeyChar
    Case "0"c To "9"c
    Case "."c
        If .Text.Contains(".") Then
            e.Handled = True
        End If
    Case ChrW(Keys.Delete), ChrW(Keys.Back)
    Case Else
        e.Handled = True
End Select

来源：https://stackoverflow.com/questions/8915626/what-is-the-keycode-for-comma-and-dot-in-net