是否可以在RelayCommand中设置e.Handled = true？

Question

So I've got a hyperlink that I have hooked up to the code behind like so:

Xaml

<TextBlock x:Name="Hyperlink" HorizontalAlignment="Left" VerticalAlignment="Bottom" Margin="3" FontSize="14" Foreground="White">           
      <Hyperlink NavigateUri="{Binding StreetViewString}" RequestNavigate="Hyperlink_RequestNavigate" Foreground="White" StylusDown="Hyperlink_StylusDown" TouchDown="Hyperlink_TouchDown">
             Google
      </Hyperlink>
</TextBlock> 

Code Behind

private void addToDiary_MouseDown(object sender, MouseButtonEventArgs e)
{
    ((sender as Button).DataContext as MyViewModel).MyCommand.Execute(null);
    e.Handled = true;
}

But I would like to hook this straight up to the command it is executing

    private ICommand _myCommand;
    public ICommand MyCommand
    {
        get
        {
            return _myCommand
                ?? (_myCommand= CommandFactory.CreateCommand(
                () =>
                {
                    DoSomething();
                }));
        }
    }

but the only thing that is stopping me is that I cannot set e.Handled = true from my command. Is it possible to do this without using the code behind?

Answer 1

I am going to presume you're using MVVM and ideally you want to be able to 'handle' the click of the hyperlink in the ViewModel and not in the View - which is the correct way to do this.

In which you are probably best using a normal WPF button which has been styled to look like a hyperlink and then bind in the Command property of the button to an instance of your ICommand implmentation.

The following should style the button:

<Style x:Key="HyperLinkButton"
       TargetType="Button">
    <Setter
        Property="Template">
        <Setter.Value>
            <ControlTemplate
                TargetType="Button">
                <TextBlock
                    TextDecorations="Underline">
                <ContentPresenter /></TextBlock>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
    <Setter
        Property="Foreground"
        Value="Blue" />
    <Style.Triggers>
        <Trigger
            Property="IsMouseOver"
            Value="true">
            <Setter
                Property="Foreground"
                Value="Red" />
        </Trigger>
    </Style.Triggers>
</Style>

Applying the Style and binding the Command property, this requires you have bound the DataContext of the containing control\\view to the ViewModel. as I said if you are doing MVVM this should be obvious:

<Button Style="{StaticResource HyperLinkButton}"
        Content="Some Link"
        Command={Binding Path=MyCommand, Mode=OneWay/>