给定文件夹（如 C:\Random 文件夹），如何找到所有扩展名并打印它们 C#？

Question

I've searched and found only how to get a certain extension(like txt.). I need to get all of the extensions and print them on the console. How is that possible?

Answer 1

var dir = new DirectoryInfo(@"C:\Random\");
var allExtensions = dir.EnumerateFiles().Select(f => f.Extension).Distinct();
foreach (string ext in allExtensions)
    Console.WriteLine(ext);

Use this if you want to list all extensions also in sub-directories:

var allExtensions = dir.EnumerateFiles("*.*", SearchOption.AllDirectories)
    .Select(f => f.Extension)
    .Distinct();