Methods to highlight /or change the colors of line inside a WPF RichTextBox element.
Select a line according to its index number:
TextPointer start = richTextBox1.CaretPosition.GetLineStartPosition(LineNumber);
TextPointer stop = richTextBox1.CaretPosition.GetLineStartPosition(LineNumber+ 1);
TextRange textrange = new TextRange(start, stop);
textrange.ApplyPropertyValue(TextElement.ForegroundProperty, new SolidColorBrush(Colors.Blue));
Select all line:
TextPointer start = richTextBox1.CaretPosition.DocumentStart;
TextPointer stop = richTextBox1.CaretPosition.DocumentEnd;
TextRange textrange = new TextRange(start, stop);
textrange.ApplyPropertyValue(TextElement.ForegroundProperty, new SolidColorBrush(Colors.Black));
if you get an error of type "The calling thread cannot access this object because a different thread owns it" or if the program "freezes" in an inexplicable way. You should you the Dispatcher to avoid thread conflict:
private delegate void SetColorDelegate();
private void ExecuteInstruction()
{
try
{
Dispatcher.BeginInvoke(new SetColorDelegate(setcolor));
}
catch (Exception e)
{
//The calling thread cannot access this object because a different thread owns it
}
}
private void setcolor()
{
TextPointer start = richTextBox1.CaretPosition.GetLineStartPosition(ProtocolPointer);
TextPointer stop = richTextBox1.CaretPosition.GetLineStartPosition(ProtocolPointer + 1);
TextRange textrange = new TextRange(start, stop);
textrange.ApplyPropertyValue(TextElement.ForegroundProperty, new SolidColorBrush(Colors.Blue));
}