87 wpf RichText

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Input;
using System.Windows.Media;
using System.ComponentModel;
using System.IO;
using Microsoft.Win32;
using System.Windows.Documents;

namespace WpfApplication1
{
    public class EditSomeRichText : Window
    {
        RichTextBox txtbox;
        string strfile = "document files(*.xaml)";
        [STAThread]
        public static void Main()
        {
            Application app = new Application();
            app.Run(new EditSomeRichText());
        }

        public EditSomeRichText()
        {
            Title = "edit some rich text";
            txtbox = new RichTextBox();
            txtbox.VerticalScrollBarVisibility = ScrollBarVisibility.Auto;
            Content = txtbox;
            txtbox.Focus();
        }
        protected override void OnPreviewTextInput(TextCompositionEventArgs e)
        {
            if (e.ControlText.Length > 0 && e.ControlText[0] == '\x0F')
            {
                OpenFileDialog dlg = new OpenFileDialog();
                dlg.CheckFileExists = true;
                dlg.Filter = strfile;
                if ((bool)dlg.ShowDialog(this))
                {
                    FlowDocument flow = txtbox.Document;
                    TextRange rang = new TextRange(flow.ContentStart, flow.ContentEnd);
                    Stream strm = null;
                    try
                    {
                        strm = new FileStream(dlg.FileName, FileMode.Open);
                        rang.Load(strm, DataFormats.Xaml);

                    }
                    catch (Exception exc)
                    {
                        MessageBox.Show(exc.Message, Title);
                    }
                    finally
                    {
                        if (strm != null)
                        {
                            strm.Close();
                        }
                    }

                }
                e.Handled = true;
            }
            if (e.ControlText.Length > 0 && e.ControlText[0] == '\x13')
            {
                SaveFileDialog dlg = new SaveFileDialog();
                dlg.Filter = strfile;
                if ((bool)dlg.ShowDialog(this))
                {
                    FlowDocument flow = txtbox.Document;
                    TextRange rang = new TextRange(flow.ContentStart, flow.ContentEnd);
                    Stream strm = null;
                    try
                    {
                        strm = new FileStream(dlg.FileName, FileMode.Create);
                        rang.Save(strm, DataFormats.Xaml);

                    }
                    catch
                    {

                    }
                    finally
                    {
                        if (strm != null)
                        { strm.Close(); }
                    }
                }
                e.Handled = true;
            }
            base.OnPreviewTextInput(e);
        }
    }
}