// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002035/directoryinfo-deletefileswhere

​

// @nuget: Z.ExtensionMethods

​

using System;

using System.IO;

​

public class Program

{

    public static string DirectoryName = "Main Directory";

    public static void Main()

    {

        CreateFilesAndDirectories();

        //C# Extension Method - DirectoryInfo - GetFileSystemEntries

        var entries = DirectoryName.ToDirectoryInfo().GetFileSystemEntries();

​

        foreach (var entry in entries)

        {

             Console.WriteLine(entry);

        }

        //C# Extension Method - DirectoryInfo - DeleteFilesWhere

        DirectoryName.ToDirectoryInfo().DeleteFilesWhere(x => x.Name.Contains("Framework"));

        Console.WriteLine("\n\nData in current directory after calling DeleteFilesWhere method.\n\n");

​

        //C# Extension Method - DirectoryInfo - GetFileSystemEntries

        entries = DirectoryName.ToDirectoryInfo().GetFileSystemEntries();

        foreach (var entry in entries)

        {

             Console.WriteLine(entry);

        }

    }

    private static void CreateFilesAndDirectories()

    {

        DirectoryName.ToDirectoryInfo().Create();

        DirectoryName.ToDirectoryInfo().CreateSubdirectory("Entity Framework");

        DirectoryName.ToDirectoryInfo().CreateSubdirectory(".Net Framework");

        DirectoryName.ToDirectoryInfo().CreateSubdirectory("Java");

        DirectoryName.ToDirectoryInfo().CreateSubdirectory("SQL");

        string file1 = DirectoryName + "\\EntityFramework.txt";

        string file2 = DirectoryName + "\\oldTest.txt";

        file1.ToFileInfo().WriteAllText("EF text");

        file2.ToFileInfo().WriteAllText("text");

    }

}