在文件夹中查找具有某个扩展名的文件

给定一个文件夹路径(如 C:\Random Folder) ，如何在其中找到包含某个扩展名(如 txt)的文件？我假设我必须在目录中搜索 *.txt，但是我不确定首先应该如何开始这个搜索。

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最佳答案

Look at the System.IO.Directory class and the static method GetFiles. It has an overload that accepts a path and a search pattern. Example:

 string[] files = System.IO.Directory.GetFiles(path, "*.txt");
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You could use the Directory class

 Directory.GetFiles(path, "*.txt", SearchOption.AllDirectories)
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It's quite easy, actually. You can use the System.IO.Directory class in conjunction with System.IO.Path. Something like (using LINQ makes it even easier):

var allFilenames = Directory.EnumerateFiles(path).Select(p => Path.GetFileName(p));


// Get all filenames that have a .txt extension, excluding the extension
var candidates = allFilenames.Where(fn => Path.GetExtension(fn) == ".txt")
.Select(fn => Path.GetFileNameWithoutExtension(fn));

There are many variations on this technique too, of course. Some of the other answers are simpler if your filter is simpler. This one has the advantage of the delayed enumeration (if that matters) and more flexible filtering at the expense of more code.

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The method below returns only the files with certain extension (eg: file with .txt but not .txt1)

public static IEnumerable<string> GetFilesByExtension(string directoryPath, string extension, SearchOption searchOption)
{
return
Directory.EnumerateFiles(directoryPath, "*" + extension, searchOption)
.Where(x => string.Equals(Path.GetExtension(x), extension, StringComparison.InvariantCultureIgnoreCase));
}
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As per my understanding, this can be done in two ways :

1) You can use Directory Class with Getfiles method and traverse across all files to check our required extension.

Directory.GetFiles("your_folder_path)[i].Contains("*.txt")

2) You can use Path Class with GetExtension Method which takes file path as a parameter and verifies the extension.To get the file path, just have a looping condition that will fetch a single file and return the filepath that can be used for verification.

Path.GetExtension(your_file_path).Equals(".json")

Note : Both the logic has to be inside a looping condition.

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Use this code for read file with all type of extension file. 

string[] sDirectoryInfo = Directory.GetFiles(SourcePath, "*.*");

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