WPF FlowDocument - Absolute Character Position

Posted by Alan Spark on Stack Overflow See other posts from Stack Overflow or by Alan Spark
Published on 2010-04-02T08:45:22Z Indexed on 2010/04/02 8:53 UTC
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Filed under:

.NET

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wpf

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c#

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flowdocument

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richtextbox

I have a WPF RichTextBox that I am typing some text into and then parsing the whole of the text to do processing on. During this parse, I have the absolute character positions of the start and end of each word.

I would like to use these character positions to apply formatting to certain words. However, I have discovered that the FlowDocument uses TextPointer instances to mark positions in the document.

I have found that I can create a TextRange by constructing it with start and end pointers. Once I have the TextRange I can easily apply formatting to the text within it. I have been using GetPositionAtOffset to get a TextPointer for my character offset but suspect that its offset is different from mine because the selected text is in a slightly different position from what I expect.

My question is, how can I accurately convert an absolute character position to a TextPointer?

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