“Customizing UI and Controls in Spire.PDFViewer for Desktop Apps”

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10 Common Tasks with Spire.PDFViewer and How to Implement Them

Spire.PDFViewer is a .NET control for loading, viewing, printing and exporting PDF documents. Below are 10 common tasks developers perform with Spire.PDFViewer, each with a short explanation and a concise C# example you can drop into a Windows Forms app using the PdfDocumentViewer control (references: Spire.PdfViewer.Forms.dll and Spire.Pdf.dll).

1. Load a PDF (file, stream, byte[])

• Purpose: Open PDF from disk, memory stream, or byte array.
• Key method: LoadFromFile, LoadFromStream, LoadFromBytes
• Example (file):

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pdfDocumentViewer1.LoadFromFile(@“C:\\Docs\\sample.pdf”);

• Example (stream):

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using (var fs = File.OpenRead(@“C:\\Docs\\sample.pdf”))
pdfDocumentViewer1.LoadFromStream(fs);

• Example (bytes):

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byte[] data = File.ReadAllBytes(“sample.pdf”);
pdfDocumentViewer1.LoadFromBytes(data);

2. Navigate pages (next, previous, go to page)

• Purpose: Programmatic paging and reading current page number.
• API: CurrentPageNumber, PageCount, GoToPage “`csharp // Next page if (pdfDocumentViewer1.CurrentPageNumber < pdfDocumentViewer1.PageCount) pdfDocumentViewer1.GoToPage(pdfDocumentViewer1.CurrentPageNumber + 1);

// Previous page if (pdfDocumentViewer1.CurrentPageNumber > 1) pdfDocumentViewer1.GoToPage(pdfDocumentViewer1.CurrentPageNumber – 1);

// Go to specific page pdfDocument

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