如何比较多个PDF文件并获得C＃中页面数最少的PDF？ [英] How do compare multiple PDF files and get the PDF with the least number of pages in C#?

问题描述

我正在检索目录中所有.pdf文件的列表，我有一个函数来获取一个pdf的页面数。

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.

//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;
    }
}

请忽略MessageBox，因为我刚用它来查看值是否正确。



现在，我想获得

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

string[] filePaths

。



请帮忙。



问候



我尝试过：



我已经在我的问题中展示了我所做的一切。我没有尝试过任何东西，因为我不确定什么以及如何继续

.

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

推荐答案

首先：你的页面计数方法不可靠。 />
例如它给了我0的PDF文件实际上包含超过1000页。



如果你有一个可靠的页数方法

你必须收集使用如下模型的文件名和页数：

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; }
}

例如

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}有{result.PageCount}页面。）;
}
}

"{result.Filename} has {result.PageCount} pages."); } }

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