using System;

using System.Net.Http;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("original code - *not* singleton httpclient");

        new ProviderClientOriginal("http://www.example.com");

        new ProviderClientOriginal("http://www.example.com");

        new ProviderClientOriginal("http://www.example.com");

        Console.WriteLine("---------------------------------------------------");

        Console.WriteLine("singleton httpclient code");

        new ProviderClientSingleton();

        new ProviderClientSingleton();

        new ProviderClientSingleton();  

    }

}

​

public class ProviderClientOriginal

{

    private static HttpClient _httpClient;

    public ProviderClientOriginal(string baseUrl)

    {

         _httpClient = new HttpClient{BaseAddress = new Uri(baseUrl)};

         Console.WriteLine("instantiate new HttpClient()!!");   

    }

}

​

​

public class ProviderClientSingleton

{

    private static HttpClient _httpClient;

    static ProviderClientSingleton()

    {

         string baseUrl = "http://www.example.com";

         _httpClient = new HttpClient{BaseAddress = new Uri(baseUrl)};

         Console.WriteLine("instantiate new HttpClient()!!");   

    }

}

​