WPF在XAML中使用变音符添加KeyBinding事件

Question

Can anyone tell me why keybinding events do not work with umlaut characters like this?

Trying in xaml

<Grid.InputBindings>
    <KeyBinding Key="Ü" ... />
</Grid.InputBindings>

Will throw error:

Cannot convert string value 'Ü' to type System.Windows.Input.Key

Answer 1

I've made a small test program to find out which Key is what. Make new WPF project and add to main window cs-file:

public MainWindow()
{
    InitializeComponent();
    var skip = new[] { Key.None, Key.DeadCharProcessed };
    foreach (Key value in Enum.GetValues(typeof(Key)))
        if (!skip.Contains(value))
            InputBindings.Add(new KeyBinding { Command = new MyCommand(value.ToString()), Key = value });
}

public class MyCommand : ICommand
{
    public event EventHandler CanExecuteChanged;

    public string Text { get; }

    public MyCommand(string text) { Text = text; }

    public bool CanExecute(object parameter) => true;
    public void Execute(object parameter) => MessageBox.Show(Text);
}

To save you time:

Ü = Key.Oem1
Ö = Key.Oem3
Ä = Key.OemQuotes

Answer 2

Because KeyBinding.Key is enumeration, you can see all possible values here . Since your umlaut character is not part of that enumeraton - you cannot use it.