Defining MenuItem Shortcuts

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H.B. was right… I just wanted to add more precisions.

Remove the Click event on your MenuItem and associate it with a Command instead.

1 – Add/create your commands: 

<Window.CommandBindings>
     <CommandBinding Command="Open" Executed="OpenCommandBinding_Executed"/>
     <CommandBinding Command="SaveAs" Executed="SaveAsCommandBinding_Executed"/>
</Window.CommandBindings>

The commands are refering to the following code:

private void OpenCommandBinding_Executed(object sender, ExecutedRoutedEventArgs e)
{
    Open();//Implementation of open file
}
private void SaveAsCommandBinding_Executed(object sender, ExecutedRoutedEventArgs e)
{
    SaveAs();//Implementation of saveAs
}

2 – Associate the commands with the wanted keys:

<Window.InputBindings>
    <KeyBinding Key="O" Modifiers="Control" Command="Open"/>
    <KeyBinding Key="S" Modifiers="Control" Command="SaveAs"/>
</Window.InputBindings>

3 – Finally assign the commands with you menu item (InputGestureText is just a decorating text):

<Menu Name="menu1">
    <MenuItem Header="_File">
        <MenuItem Name="menuOpen" Header="_Open..." Command="Open" InputGestureText="Ctrl+O"/>
        <MenuItem Name="menuSaveAs" Header="_Save as..." Command="SaveAs" InputGestureText="Ctrl+S"/>
    </MenuItem>
</Menu>

That way multiple inputs may be associated to the same command.

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