Error - Merge PDF Files using PDFSharp DLL

[holuomaVB]

I am trying to creat an Object that merges PDF. I have installed PDFSharp DLL and added namespaces, but it seems to be giving errors. Is there anything am missing? Can anyone provide me a code to merge PDF uisng PDFSharp? Below is my code

Public Sub MergePDFs()
Try
' Input file paths
Dim inputPaths As String() = {"C:\path\file1.pdf", "C:\path\file2.pdf"}
Dim outputPath As String = "C:\path\merged.pdf"

' Create a new PDF document for output
Dim outputDocument As New PdfDocument()

' Loop through all input files
For Each pdfPath As String In inputPaths
If Not System.IO.File.Exists(pdfPath) Then
Throw New Exception($"File not found: {pdfPath}")
End If

' Open the input document
Dim inputDocument As PdfDocument = PdfReader.Open(pdfPath, PdfDocumentOpenMode.Import)

' Copy pages from input to output
For Each page As PdfPage In inputDocument.Pages
outputDocument.AddPage(page)
Next
Next

' Save the merged document
outputDocument.Save(outputPath)

Catch ex As Exception
Throw New Exception($"Error during PDF merge: {ex.Message}")
End Try
End Sub

[david.l.morris]

What error(s) do you get?

[david.l.morris]

You have VB.NET so this may not help you, but here is some code that I used in the past for PDFSharp to merge Multiple files if you want to switch to C# or use this to compare to yours or rewrite in VB.NET:

Inputs:
[inputPaths] (DataTable) expecting either just one column or one of the columns to be named "Path".

[newFileName] (Text)
[outputFolderPath] (Text)

Outputs:
[outputFilePath] (Text)

External References:

System

System.Data.dll

System.Drawing.dll

PdfSharp.dll

System.Linq.dll

System.Collections.dll

System.Core.dll

Namespace Imports:
System

System.Drawing

System.Data

System.Diagnostics

System.IO

PdfSharp.Pdf

PdfSharp.Pdf.IO

System.Linq

System.Collections

System.Collections.Generic

System.Threading.Tasks

System.Text.RegularExpressions

System.Text

PdfSharp.Pdf.Content

PdfSharp.Pdf.Content.Objects

PdfSharp.Pdf.Advanced

// set up some variables
string[] files;

if (inputPaths.Columns.Count > 1)
{
	// get a string array out of the Path column
	files = inputPaths.Rows.OfType<DataRow>().Select(k => k["Path"].ToString()).ToArray();
}
else
{
	// get a string array out of a DataTable regardless of the Field Name
	files = inputPaths.Rows.OfType<DataRow>().Select(k => k[0].ToString()).ToArray();
}

if (string.IsNullOrEmpty(newFileName))
{
	newFileName = Path.GetFileNameWithoutExtension(files[0]) + "_merged";
}
else
{
	newFileName = Path.GetFileNameWithoutExtension(newFileName);
}

if (string.IsNullOrEmpty(outputFolderPath))
{
	outputFolderPath = Directory.GetParent(files[0]).ToString();
}

outputPath = Path.Combine(outputFolderPath, newFileName + ".pdf");

// Open the output document
PdfDocument outputDocument = new PdfDocument();

// Iterate files
foreach (string file in files)
{
	// Open the document to import pages from it.
	PdfDocument inputDocument = PdfReader.Open(file, PdfDocumentOpenMode.Import);

	// Iterate pages
	int count = inputDocument.PageCount;
	for (int idx = 0; idx < count; idx++)
	{
		// Get the page from the external document...
		PdfPage page = inputDocument.Pages[idx];
		// ...and add it to the output document.
		outputDocument.AddPage(page);
	}
}

// Save the document...
outputDocument.Save(outputPath);