Examples of merging multiple document formats into a PDF binder, extracting pages, and validating page count.

README.md

📦 Prerequisites

• .NET 6 or later
• GroupDocs.Merger for .NET (install via NuGet: Install-Package GroupDocs.Merger)
• Trial license: Get a free 30-day temporary license

💻 Key Capabilities

• Merge Word, Excel, and PDF files into a single PDF binder
• Extract specific pages from an existing PDF binder
• Validate merged output by retrieving total page count
• Scan a folder and automatically merge all supported documents

📎 Code Example

See the following example files for each operation:

• MergeMultipleFormatsIntoPdf.cs — combines DOCX, XLSX, and PDF into one PDF binder
• ExtractBinderSection.cs — extracts a subset of pages from a PDF binder
• GetMergedPageCount.cs — retrieves the total page count of a merged PDF
• CreatePdfBinderFromFolder.cs — scans a folder and merges all supported documents

🛠 How to Use

1. Install GroupDocs.Merger via NuGet.
2. Prepare your source files (e.g., .docx, .xlsx, .pdf).
3. Use Merger to join files with JoinOptions (PDF must be the primary file for cross-format conversion).
4. For extraction, use ExtractOptions with desired page numbers.
5. Call Save() to persist the result.
6. Use GetDocumentInfo() to verify output integrity.

📎 Related Articles

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CreatePdfBinderFromFolder.cs

// Folder containing source documents
string folderPath = "./input_documents";
string outputPath = "folder_binder.pdf";

var extensions = new[] { ".pdf", ".docx", ".xlsx" };
var files = Directory
    .EnumerateFiles(folderPath)
    .Where(f => extensions.Contains(
        Path.GetExtension(f).ToLowerInvariant()))
    .OrderBy(f => Path.GetExtension(f).ToLowerInvariant() == ".pdf"
        ? 0 : 1)
    .ThenBy(f => f)
    .ToArray();

if (files.Length == 0)
{
    throw new InvalidOperationException(
        $"No supported documents found in '{folderPath}'.");
}

Console.WriteLine(
    $"Folder binder: discovered {files.Length} files in {folderPath}");
return MergeMultipleFormatsIntoPdf(files, outputPath);

ExtractBinderSection.cs

// Path to the source PDF binder
string binderPath = "output_binder.pdf";
string outputPath = "extracted_section.pdf";

// Define page numbers to extract (1-based indexing)
int[] pages = { 1, 2, 5 };

using var merger = new Merger(binderPath);
merger.ExtractPages(new ExtractOptions(pages));
merger.Save(outputPath);

Console.WriteLine(
    $"Extracted pages [{string.Join(",", pages)}] to "
    + Path.GetFullPath(outputPath));

GetMergedPageCount.cs

// Path to the merged PDF
string pdfPath = "output_binder.pdf";

using var merger = new Merger(pdfPath);
var info = merger.GetDocumentInfo();
return info.PageCount;

MergeMultipleFormatsIntoPdf.cs

// Paths to the source documents
string[] sourcePaths = {
    "source.docx",
    "source.xlsx",
    "source.pdf"
};
string outputPath = "output_binder.pdf";

Console.WriteLine($"Primary source: {sourcePaths[0]}");
using var merger = new Merger(sourcePaths[0]);

var joinOptions = new JoinOptions();
for (int i = 1; i < sourcePaths.Length; i++)
{
    Console.WriteLine($"Joining: {sourcePaths[i]}");
    merger.Join(sourcePaths[i], joinOptions);
}

merger.Save(outputPath);
Console.WriteLine(
    $"Unified PDF binder saved to: {Path.GetFullPath(outputPath)}");