CODEWITHSUNDEEP
.netdependency-injectionwebformshttpclientfactory
Jatin
Jatin

Reputation: 91

IHttpClientFactory in .NET Framework 4.7.2 without Dependency Injection

I am planning to use Microsoft.Extensions.Http package in my ASP.NET Framework 4.7.2 Webforms project. Since there is no built-in DI Container in .NET Framework, I am not using the DI packages. Based on this answer, I am not sure about the last line -

Microsoft.Extensions.Http provides the HttpClientFactory only, not the new optimized HttpClient. This is only available in .NET Core 2.1

Can I implement IHttpClientFactory without DI and using singleton method in my Framework project and get rid of the 2 problems of using HttpClient directly - Socket Exhaustion and DNS resolution? Is there something else that needs to be done based on the above comment

Upvotes: 9

Views: 8438

Answers (1)

Steven
Steven

Reputation: 172825

Unfortunately, the use of the HttpClientFactory is tightly integrated with the DI framework. Fortunately, creating a new IHttpClientFactory without making use of the full DI infrastructure can be done in a few lines:

IHttpClientFactory factory = new ServiceCollection()
    .AddHttpClient()
    .BuildServiceProvider()
    .GetRequiredService<IHttpClientFactory>();

With the code above you create new new service provider (which is the MS.DI Container) that just contains the registrations for the HTTP client package, which includes a registration for IHttpClientFactory, and the IHttpClientFactory is directly pulled from the container. The factory is stored in a variable, while the container itself is no longer used.

A full working Console application would like like this:

// This requires the 'Microsoft.Extensions.Http` package to be installed
using Microsoft.Extensions.DependencyInjection;
using System;
using System.Net.Http;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Web;

internal class Program
{
    static async Task Main(string[] args)
    {
        IHttpClientFactory factory = new ServiceCollection()
            .AddHttpClient()
            .BuildServiceProvider()
            .GetRequiredService<IHttpClientFactory>();

        HttpClient client = factory.CreateClient();

        string html = await client.GetStringAsync(
            "https://blogs.cuttingedge.it/steven/posts/2011/" +
            "meanwhile-on-the-command-side-of-my-architecture/");

        string plainText = HttpUtility.HtmlDecode(
            Regex.Replace(
                Regex.Replace(html, "<[^>]*>", string.Empty),
                @"^\s*$\n", string.Empty, RegexOptions.Multiline));

        Console.WriteLine(plainText);

        Console.ReadLine();
    }
}

Best is to cache the IHttpClientFactory for the lifetime of your application and not recreate it on the fly.

Upvotes: 18

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