按 F1 打开 wpf C# 中的子菜单项

Question

我想更改圣键F1，而不是使用Alt + F打开菜单“文件”，我该怎么做？ 谢谢

 <Grid>
    <Menu Background="Transparent">
        <MenuItem x:Name="asd" Header="_File">
            <MenuItem x:Name="a"  Header="1. _New" InputGestureText="ALT-N" Margin="0,18,0,0"/>
            <MenuItem Header="2. _Open" InputGestureText="Alt+O"/>
            <MenuItem Header="3. _Close"/>
            <MenuItem Header="4. Save"/>
            <Separator/>
            <MenuItem Header="5. Delete" Margin="0,8,0,0"/>
            <MenuItem Header="6. Rename"/>
            <Separator/>
            <MenuItem Header="7. Print" Margin="0,8,0,8"/>
            <Separator/>
            <MenuItem Header="8. Format Disk" Margin="0,8,0,8"/>
            <Separator/>
            <MenuItem Header="9. MINE(Decode)" Margin="0,8,0,8"/>
        </MenuItem>
    </Menu>
</Grid>  

Answer 1

获得所需行为的一种方法是将PreviewKeyDown事件侦听器添加到您的Grid或父级。

<Grid PreviewKeyDown="Grid_PreviewKeyDown">
    <Menu Background="Transparent">
        <MenuItem x:Name="asd" Header="_File">
            <MenuItem x:Name="a"  Header="1. _New" InputGestureText="ALT-N" Margin="0,18,0,0"/>
            <MenuItem Header="2. _Open" InputGestureText="Alt+O"/>
            <MenuItem Header="3. _Close"/>
            <MenuItem Header="4. Save"/>
            <Separator/>
            <MenuItem Header="5. Delete" Margin="0,8,0,0"/>
            <MenuItem Header="6. Rename"/>
            <Separator/>
            <MenuItem Header="7. Print" Margin="0,8,0,8"/>
            <Separator/>
            <MenuItem Header="8. Format Disk" Margin="0,8,0,8"/>
            <Separator/>
            <MenuItem Header="9. MINE(Decode)" Margin="0,8,0,8"/>
        </MenuItem>
    </Menu>
</Grid>  

然后在底层 C# 代码中添加以下动作事件

private void Grid_PreviewKeyDown(object sender, KeyEventArgs e)
{
    if (e.Key == Key.F1) // This filters what key was pressed
    {
        asd.IsSubmenuOpen = true; // This opens the menu
        e.Handled = true; // Setting this to true prevents the any other events from occurring due to the key press
    }
}