如何在c# wpf中将命令绑定到超链接？

Question

我知道我可以使用以下代码创建 RequestNavigate 事件的处理程序：

private static readonly ProcessStartInfo s_previewLinkProcessStartInfo = new() { UseShellExecute = true };
private void PreviewLink_RequestNavigate(object sender, System.Windows.Navigation.RequestNavigateEventArgs e)
{
    s_previewLinkProcessStartInfo.FileName = e.Uri.AbsoluteUri;
    using (Process.Start(s_previewLinkProcessStartInfo))
        e.Handled = true;
}

上面的代码完美运行。但如果我使用相同的代码但使用命令，它将抛出 System.InvalidOperationException：“无法将资源转换为对象。”：

public ICommand PreviewLinkNavigateCommand => new RelayCommand(obj =>
{
    s_previewLinkProcessStartInfo.FileName = PreviewLink.NavigateUri.AbsoluteUri;
    using (Process.Start(s_previewLinkProcessStartInfo)) { } // throws a System.InvalidOperationException: "Failed to convert resource to object."
});

Xaml：

<TextBlock Padding="10 0 10 0">
    <Hyperlink x:Name="PreviewLink" FontSize="14" 
               NavigateUri="{Binding SelectedMedia.Source.AbsoluteUri}"
               Command="{Binding PreviewLinkNavigateCommand}">
        Preview link
    </Hyperlink>
</TextBlock>

中继命令：

internal class RelayCommand : ICommand
{
    private readonly Action<object?> _execute;
    private readonly Func<object?, bool>? _canExecute;

    public event EventHandler? CanExecuteChanged
    {
        add => CommandManager.RequerySuggested += value;
        remove => CommandManager.RequerySuggested -= value;
    }

    public RelayCommand(Action<object?> execute, Func<object?, bool>? canExecute = null)
    {
        _execute = execute;
        _canExecute = canExecute;
    }

    public bool CanExecute(object? parameter) => _canExecute?.Invoke(parameter) ?? true;
    public void Execute(object? parameter) => _execute(parameter);
}

Answer 1

这对您有用还是您不能直接将其写入 XAML？ （以谷歌为例，但你也可以输入文件路径，它们就会工作）

XAML

<TextBlock Grid.Row="1" Grid.Column="2" HorizontalAlignment="Center" VerticalAlignment="Bottom" FontSize="18" FontWeight="Bold">
    <Hyperlink RequestNavigate="Hyperlink_RequestNavigate"
               NavigateUri="https://www.google.co.uk/">Google</Hyperlink>
</TextBlock>

背后代码

private void Hyperlink_RequestNavigate(object sender, RequestNavigateEventArgs e) => Process.Start(e.Uri.AbsoluteUri);