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Apply Syntax Highlighting in a Text Control

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Apply Syntax Highlighting in a Text Control <Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="500" Width="700"> <Grid> <RichTextBox x:Name="rtbTextContent" TextChanged="RichTextBox_TextChanged" /> </Grid> </Window> //File:Window.xaml.cs using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Media; namespace WpfApplication1 { public partial class Window1 : Window { public Window1() { InitializeComponent(); } private void RichTextBox_TextChanged(object sender, TextChangedEventArgs e) { TextRange textRange = new TextRange(rtbTextContent.Document.ContentStart, rtbTextContent.Document.ContentEnd); rtbTextContent.TextChanged -= RichTextBox_TextChanged; textRange.ClearAllProperties(); ApplyFormatting(); rtbTextContent.TextChanged += RichTextBox_TextChanged; } private void ApplyFormatting() { TextPointer tp = rtbTextContent.Document.ContentStart; tp = FindNextString(tp); TextPointer textRangeEnd = tp.GetPositionAtOffset(1, LogicalDirection.Forward); TextRange tokenTextRange = new TextRange(tp, tp.GetPositionAtOffset(1, LogicalDirection.Forward)); tokenTextRange.ApplyPropertyValue(TextElement.ForegroundProperty, Brushes.Blue); } private TextPointer FindNextString(TextPointer tp) { char[] buffer = new char[1]; tp.GetTextInRun(LogicalDirection.Forward, buffer, 0, 1); return tp; } } }