UWP copier le contenu d'un RichEditBox

Question

Bonjour je cherche comment copier le texte contenu dans un control RichEditBox.Dans mon code il se nome RichBox.

 private async void CopyBtn_Click(object sender, RoutedEventArgs e)
        {
            DataPackage package = new DataPackage();
            package.RequestedOperation = DataPackageOperation.Copy;
            package.SetText(RichBox.Document.GetText(Windows.UI.Text.TextGetOptions.FormatRtf));
            Clipboard.SetContent(package);
            DataPackageView view = Clipboard.GetContent();
            if (view.Contains(StandardDataFormats.Text))
            {
                string text = await view.GetTextAsync();
            }
        }

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JF Collombet ® CreateSpecificCulture