Unable to resolve service for type 'System.Net.Http.HttpClient' 无法解析类型为'System.Net.Http.HttpClient'的服务。
Unable to resolve service for type 'System.Net.Http.HttpClient' 无法解析类型为'System.Net.Http.HttpClient'的服务。
我创建了一个ViewComponent
类,使用HttpClient
调用了一个REST API
,代码如下:
public class ProductsViewComponent : ViewComponent { private readonly HttpClient _client; public ProductsViewComponent(HttpClient client) { _client = client ?? throw new ArgumentNullException(nameof(client)); } public async TaskInvokeAsync(string date) { using(var response = await _client.GetAsync($"/product/get_products/{date}")) { response.EnsureSuccessStatusCode(); var products = await response.Content.ReadAsAsync >(); return View(products); } } }
我遇到了这个错误:
InvalidOperationException: 在尝试激活MyApp.ViewComponents.ProductsViewComponent时,无法解析类型“System.Net.Http.HttpClient”的服务。
我在Startup
中的ConfigureServices
方法中以这种方式注入了HttpClient
:
services.AddHttpClient(options => { options.BaseAddress = new Uri("http://80.350.485.118/api/v2"); });
更新:
我也注册了ProductsViewComponent
,但仍然遇到同样的错误。