How to get the selected paragraph of FlowDocument?

Question

In the MainWindow.xaml, I've these:

<FlowDocumentScrollViewer x:Name="scroll" PreviewMouseDoubleClick="onSelectionChanged">
    <FlowDocument x:Name="doc" FontSize="20"/>
</FlowDocumentScrollViewer>

and in MainWindow.cs these:

public partial class MainWindow : Window
{
    public MainWindow() {
        InitializeComponent();
        for (int i = 1; i < 51; i++) {
            doc.Blocks.Add(new Paragraph() {
                Tag = i,
                Inlines = { new Run(i +") " + "Para No. " + i) }
            });
        }
    }

    void onSelectionChanged(object sender, MouseButtonEventArgs e) {
        //Here I want to access the Paragraph in which Selection's made
        //var start = scroll.Selection.Start;
        //var end = scroll.Selection.End;
        //var range = new TextRange(start, end);
        //Debug.WriteLine(range.Text);
    }
}

I want to access the paragraph, where a word is selected by double clicking, to get the Tag no and the selected word's position (by splitting the text with the space).

Answer 1

To get the paragraph and its tag:

var p = scroll.Selection.Start.Paragraph;
var tag = p.Tag;