WPF RichTextBox 导出与加载

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            string savePth = System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "richtextboxData.data");
            using (System.IO.FileStream fs = new System.IO.FileStream(savePth, System.IO.FileMode.OpenOrCreate))
            {
                var textrange = new TextRange(rtb.Document.ContentStart, rtb.Document.ContentEnd);
                textrange.Save(fs, DataFormats.XamlPackage);
            }
        }

        private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            string savePth = System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "richtextboxData.data");
            TextRange textrange = new TextRange(rtb.Document.ContentStart, rtb.Document.ContentEnd);
            using (System.IO.FileStream fs = new System.IO.FileStream(savePth, System.IO.FileMode.Open))
            {
                textrange.Load(fs, DataFormats.XamlPackage);
            }
        }