Problem with multi page tif file not show all the page inside WPF

You can use LEADTOOLS Document Imaging SDK technology in your application.

https://www.leadtools.com/sdk/document/document-viewer-dotnet

The WPF Document Viewer allows you to view all the pages of a multipage image or document.

Here is some sample code:

DocumentViewerCreateOptions options = new DocumentViewerCreateOptions();
options.ViewContainer = _centerGrid;
options.ThumbnailsContainer = _thumbnailGrid;
options.UseAnnotations = false;
DocumentViewer _docViewer = DocumentViewerFactory.CreateDocumentViewer(options);
_document = DocumentFactory.LoadFromFile(@"FILE PATH TO TIFF FILE", new LoadDocumentOptions());
_docViewer.BeginUpdate();
_docViewer.SetDocument(_document);
_docViewer.EndUpdate();