Is there .cs file equivalent for .razor file's @inject HttpClient Http

in .razor file I use

@inject HttpClient Http

to get access to the HTTPClient.

Is there a way to do the same in a .cs file or do I have to pass it along as a parameter?

update

I thought I had it, but I don't.

Using statements

using System.Net.Http;
using Microsoft.AspNetCore.Components;
using System.Net.Http.Json;

defined as class parameter

    [Inject]
    protected HttpClient Http {get;set;}

in my call Task

    await  Http.GetFromJsonAsync<SharedGLAccount[]>($"api/{ST_comp}/GLAccounts")

getting the following error

Microsoft.AspNetCore.Components.WebAssembly.Rendering.WebAssemblyRenderer[100]
      Unhandled exception rendering component: Value cannot be null. (Parameter 'client')

Solution

I suggest you use IHttpClientFactory for this. Checkout this documentation which explains the benefits of using this and also copied below:

Provides a central location for naming and configuring logical HttpClient instances. For example, a client named github could be registered and configured to access GitHub. A default client can be registered for general access.

Codifies the concept of outgoing middleware via delegating handlers in HttpClient. Provides extensions for Polly-based middleware to take advantage of delegating handlers in HttpClient.

Manages the pooling and lifetime of underlying HttpClientMessageHandler instances. Automatic management avoids common DNS (Domain Name System) problems that occur when manually managing HttpClient lifetimes.

Adds a configurable logging experience (via ILogger) for all requests sent through clients created by the factory.

An example of usage is:

In startup.cs file:

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    public void ConfigureServices(IServiceCollection services)
    {
        services.AddHttpClient(); // <- add this

You can inject using this in a service or repository class:

public class BasicService : IBasicService
{
    private readonly IHttpClientFactory _httpClientFactory;

    public BasicUsageModel(IHttpClientFactory httpClientFactory) // <- inject here
    {
        _httpClientFactory = httpClientFactory;
    }

or this if its razor page code behind:

[Inject] public IHttpClientFactory HttpClientFactory { get; set; }

or this if its razor page:

@inject IHttpClientFactory HttpClientFactory

And use it like this:

var httpClient = _clientFactory.CreateClient(); // <- create HTTP client