// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002681/idictionary-tohashtable

​

// @nuget: Z.ExtensionMethods

​

using System;

using System.Collections;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var input = new Dictionary<string, string> {{"txt", "notepad.exe"}, {"bmp", "paint.exe"}, {"dib", "paint.exe"}, {"rtf", "wordpad.exe"}};

​

        // C# Extension Method: IDictionary - ToHashtable

        Hashtable result = input.ToHashtable(); // return Hashtable;

        foreach (DictionaryEntry item in result)

        {

            Console.WriteLine("[{0}, {1}]", item.Key, item.Value);

        }

    }

}