I use spire pdf.dll version 4.3.0.20040 , and spire license.dll 1.3.6.40 . When i run in loadfromfile, and app return error "an item with the same key has already been added " , after continue to pass error, load again, pdf is show ! but font in form preview character change in times new roman to Arial ...
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PdfDocument doc = new PdfDocument();
doc.LoadFromFile(@"D:\\aaa.pdf");
PrintPreviewDialog preview = new PrintPreviewDialog();
preview.Document = doc.PrintDocument;
preview.PrintPreviewControl.Zoom = 1.5;
preview.WindowState = FormWindowState.Maximized;
preview.ShowDialog();
Hope to help !!
p/s : sorry, my english is not good !