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How to perform ‘Find all’ text while searching in Windows Forms PDF viewer

Platform: WinForms |
Control: PdfViewer

We can achieve this by an workaround using the FindText() API to get all the occurrences of the searched text and using it to highlight in the PDF page and reloading it in viewer.

Please, refer the below code snippet to highlight all the occurrences of the searched text.


//getting the list of rectangles for searched text
Dictionary<int, List<RectangleF>> searchedList = new Dictionary<int, List<RectangleF>>();
pdfViewerControl1.FindText(textBox1.Text, out searchedList);
PdfLoadedDocument loadedDocument = new PdfLoadedDocument(filePath);
for (int i = 0; i < searchedList.Count; i++)
        List<RectangleF> textRectangles = searchedList[i];
        foreach (RectangleF rect in textRectangles)
            //filling the rectangles of the textwith transparency
            PdfGraphicsState graphicsState = loadedDocument.Pages[i].Graphics.Save();
            loadedDocument.Pages[i].Graphics.DrawRectangle(PdfBrushes.Yellow, rect);
//saving the document in stream
MemoryStream stream = new MemoryStream();
//reloading the document in viewer




Please run the sample and type the text you want to search for in the Search textbox, then click “Find all”. All the instances of the searched text will be highlighted.

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