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    <p>I copied the following code from the MSDN documentation of the <a href="http://msdn.microsoft.com/en-us/library/system.windows.documents.textrange.select.aspx" rel="nofollow noreferrer">TextRange.Select</a> method, replaced the RichTextBox with a FlowDocumentScrollViewer and it works as expected. How did you define your TextPointers? That <em>seems</em> to be the most probable cause of your problem.</p> <p>UPDATE: I updated my code to include your selection algorithm and it still works. The only thing I'm aware of doing different is the "break" after selecting. Otherwise it'd select from the beginning of the first occurence of searchText until after the end of the last occurence. Other than that I could imagine that your searchText might not be included in your document at all (perhaps a casing issue?), but that's just guessing. Did you debug your code? Are the TextPointers valid (not null etc.) when you try to select the text?</p> <p>XAML: </p> <pre><code>&lt;FlowDocumentScrollViewer GotMouseCapture="richTB_GotMouseCapture" Name="richTB"&gt; &lt;FlowDocument&gt; &lt;Paragraph Name="myParagraph"&gt; &lt;Run&gt; When the user clicks in the RichTextBox, the selected text changes programmatically. &lt;/Run&gt; &lt;/Paragraph&gt; &lt;/FlowDocument&gt; &lt;/FlowDocumentScrollViewer&gt; </code></pre> <p>Code:</p> <pre><code>private void richTB_GotMouseCapture(object sender, MouseEventArgs e) { string searchText = "text"; TextPointer pointer = richTB.Document.ContentStart; while (pointer != null) { if (pointer.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text) { string textRun = pointer.GetTextInRun(LogicalDirection.Forward); // where textRun is the text in the flowDocument // and searchText is the text that is being searched for int indexInRun = textRun.IndexOf(searchText); if (indexInRun &gt;= 0) { TextPointer startPos = pointer.GetPositionAtOffset(indexInRun); TextPointer endPos = pointer.GetPositionAtOffset(indexInRun + searchText.Length); richTB.Selection.Select(startPos, endPos); break; } } pointer = pointer.GetNextContextPosition(LogicalDirection.Forward); } } </code></pre>
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    1. POWPF FlowDocumentScrollViewer Selection.Select Not Working
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    1. COThanks for the help. See my edit above. Do you see anything problematic with that code?
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    2. COUpdated my answer to include your selection algorithm.
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    3. COActually I do have the "break" in the same spot you do. The text that I am searching for is indeed included in the document. When I debug it finds the search text and creates TextPointers that are not null. The only difference I really see is that you are executing the code from an GotMouseCapture event. My event is being fired from another user control. But I don't see why that would be a problem as long as I can get a reference to the FlowDocumentScrollViewer correct?
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