如何使用 c# 从文件夹中计算 Excel 文件的数量？

Question

I need to count the number of excel files,pdf files from a directory.

I have Counted the total number of files from a directory using

 System.IO.DirectoryInfo dir = new System.IO.DirectoryInfo(@"D:\");
 int count = dir.GetFiles().Length; 

Any Suggestion?

Answer 1

Here's a LINQ solution.

var extensions = new HashSet<string>(StringComparer.OrdinalIgnoreCase)
{
    ".xls",
    ".xlsx",
    ".pdf",
};
var baseDir = @"D:\";
var count = Directory.EnumerateFiles(baseDir)
                     .Count(filename =>
                                extensions.Contains(Path.GetExtension(filename)));

Answer 2

Use SearchPattern in GetFiles method.

dir.GetFiles("*.XLS");

Answer 3

int count = 0;
foreach (string file in Directory.GetFiles(@"D:\"))
{
    if (file.EndsWith(".pdf") || file.EndsWith(".xls"))
    {
        count++;
    }
}

Answer 4

   var count = System.IO.Directory.GetFiles(@"D:\")
               .Count(p => Path.GetExtension(p) == ".xls");

Answer 5

String[] excelFiles=Directory.GetFiles("C:\\", "*.xls");

Answer 6

int count = Directory.GetFiles(path).Count(f =>(f.EndsWith(".xls") || f.EndsWith(".xlsx")));

Answer 7

simple

int count = dir.GetFiles("*.txt").Length + dir.GetFiles("*.pdf").Length