How do compare multiple PDF files and get the PDF with the least number of pages in C#?

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I am retrieving the list of all .pdf files in a directory and I have a function to get the number of pages for one pdf.

C#

//List of all PDF files
string[] filePaths = Directory.GetFiles(cboSource.Text, "*.pdf", SearchOption.AllDirectories);
MessageBox.Show(String.Join(Environment.NewLine, filePaths));
    
//Get the number of pages in a PDF file
public int GetNumberOfPdfPages(string fileName)
{
    using (StreamReader sr = new StreamReader(File.OpenRead(fileName)))
    {
    	Regex regex = new Regex(@"/Type\s*/Page[^s]");
    	MatchCollection matches = regex.Matches(sr.ReadToEnd());
    	return matches.Count;
    }
}

Please ignore the MessageBox as I have just used it to see whether the values are correct.

Now, I want to get the name/path of that one PDF that has the least number of pages in the total collection in

C#

string[] filePaths

.

Please help.

Regards

What I have tried:

I have shown all I that I have done in my question. I have not tried anything apart from it as I am unsure of what and how to proceed

Posted 10-Apr-19 22:14pm

Primo Chalice

Updated 11-Apr-19 1:26am

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TheRealSteveJudge · Answer 1 · 2019-04-11T01:27:00

First of all: Your method for counting pages is not reliable.
e.g. it gave me 0 for a PDF file actually containing over 1000 pages.

If you once have a reliable page count method
you must collect filename and page count by using a model like this:

public class PdfFileInfo
{
    public string Filename { get; set; }
    public int PageCount { get; set; }
}

e.g.

private void GetPdfFiles(string folder)
{
	var pdfFileInfos = new List<PdfFileInfo>();
	
	var filePaths = Directory.GetFiles(folder, "*.pdf", SearchOption.AllDirectories);

	foreach (var filePath in filePaths)
	{
		pdfFileInfos.Add(new PdfFileInfo
		{
			Filename = filePath,
			PageCount = GetNumberOfPdfPages(filePath)
		});
	}

	pdfFileInfos = pdfFileInfos.OrderBy(x => x.PageCount).ToList();

	if (pdfFileInfos.Count > 1)
	{
		var result = pdfFileInfos[0];

		MessageBox.Show($"{result.Filename} has {result.PageCount} pages.");
	}
}

How do compare multiple PDF files and get the PDF with the least number of pages in C#?

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Solution 1

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How do compare multiple PDF files and get the PDF with the least number of pages in C#?

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Solution 1

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