Highlight special word in a TextBox

问题

How do I highlight all occurrences of a list of words in a text. For example, i do have a list of strings ("if", "else", "then", "while", "true"). I do need to find them in a TextBox and highlight them (foreground + background color).

Examples as how it should look:

The current approach is to override TextBox and do "something" in the OnTextChange event.

回答1:

see this question:

How to highlight portion of a Rich TextBox WPF control if there are more than 2 spaces?

and this open source control:

http://wpfsyntax.codeplex.com/

回答2:

I'm actually using some approaches using the RichTextBox but im making steps slowly. Realized how i mark things there are still some bugs. For instance, everything gets marked after the first character to mark. So it looks just like that:

pos is the position of the character i want to mark (+1 for just one character), in OnTextChange
MarkForeground(pos + 2, pos + 2 + 1, Colors.Green); // +2 for some awkward wpf bug probably ;)

private void MarkForeground(int start, int end, Color col)
    {
        TextPointer startPointer = this.Document.ContentStart.GetPositionAtOffset(start);
        TextPointer endPointer = this.Document.ContentStart.GetPositionAtOffset(end);

        if (startPointer != null && endPointer != null)
        {

            TextRange range = new TextRange(startPointer, endPointer);


            range.ApplyPropertyValue(TextElement.ForegroundProperty, new SolidColorBrush(col));

        }
    }

来源：https://stackoverflow.com/questions/7388490/highlight-special-word-in-a-textbox

标签

wpf

syntax

textbox

highlight