Saving contens of wpf RichTextBox created at run time

In WPF, you can dynamically add controls to a TabControl just like in WinForms. To achieve this, you can create a RichTextBox dynamically and add it to the TabItem of the TabControl. Follow the example to how you can achieve this in WPF:

Define your TabControl in XAML:

In your code-behind, add the logic to dynamically create RichTextBox and add it to a new TabItem

using System.Windows;
using System.Windows.Controls;
namespace YourNamespace
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            // Call this method to dynamically add a RichTextBox to a new tab
            AddNewTabWithRichTextBox();
        }
        private void AddNewTabWithRichTextBox()
        {
            // Create a new TabItem
            TabItem newTab = new TabItem();
            newTab.Header = "New Tab"; // Set the header as needed
            // Create a new RichTextBox
            RichTextBox richTextBox = new RichTextBox();
            newTab.Content = richTextBox;
            // Add the TabItem to the TabControl
            myTabControl.Items.Add(newTab);
        }
        // Add a button click event or some other trigger to save the content of the RichTextBox
        private void SaveRichTextBoxContent_Click(object sender, RoutedEventArgs e)
        {
            // Get the currently selected TabItem
            if (myTabControl.SelectedItem is TabItem selectedTab)
            {
                // Get the RichTextBox from the TabItem's content
                if (selectedTab.Content is RichTextBox richTextBox)
                {
                    // Access the content of the RichTextBox
                    string content = new TextRange(richTextBox.Document.ContentStart, richTextBox.Document.ContentEnd).Text;
                    // Now you can save the content as needed
                    // Add your save logic here
                }
            }
        }
    }
}

The example assumes that you have a TabControl named myTabControl in your XAML. It dynamically creates a new TabItem and adds a RichTextBox to it. The SaveRichTextBoxContent_Click method demonstrates how you can access the content of the RichTextBox and save it.