httpClientFactory-服务AddHttpClient

Question

我在遵循这个指南时遇到了问题：https://docs.microsoft.com/en-us/aspnet/core/fundamentals/http-requests?view=aspnetcore-2.1#basic-usage

这是我的配置服务

public void ConfigureServices(IServiceCollection services)
        {
            services.AddHttpClient();

            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
        }

这是我的页面

 public class IndexModel : PageModel
    {
        private readonly IHttpClientFactory httpClientFactory;

        public IList<Blog> Blog { get; set; }

        public IndexModel(IHttpClientFactory httpClientFactory)
        {
            this.httpClientFactory = httpClientFactory;
        }


        public async Task OnGetAsync()
        {

        }
    }

我在浏览我的页面时收到以下错误：

InvalidOperationException: Unable to resolve service for type 'System.Net.Http.IHttpClientFactory' while attempting to activate 'WebApplication1.Pages.Blogs.IndexModel'.

我是不是遗漏了什么？谢谢你的建议

致以敬意，

foo

Answer 1

不注入HttpClientFactory，AddHttpClient注入HttpClient。

尝试：

public class SampleService : ISampleService
{
    private readonly HttpClient _httpClient;
    public SampleService(HttpClient httpClient)
    {
        _httpClient = httpClient;
    }
}

Answer 2

我认为你必须创建HttpClient：

private readonly HttpClient httpClient;

public IndexModel(IHttpClientFactory httpClientFactory)
{
    this.httpClient = httpClientFactory.CreateClient();
}