在 Startup.cs 中键入客户端设置，无法在注入的服务中获取信息

Question

我有一个演示 Azure 函数并按如下方式设置类型化客户端：但是我无法在注入的 httpclient 实例中获取基地址。有什么建议吗？谢谢

            builder.Services.AddSingleton<IMyService, MyService>();//Comment out this line will make it work
            builder.Services.AddHttpClient<IMyService, MyService>(client =>
            {
                client.BaseAddress = new Uri("https://api.github.com/");
            });

        }

    public class MyService : IMyService
    {
        private readonly HttpClient httpClient;

        public MyService(HttpClient httpClient)
        {
            this.httpClient = httpClient;
        }

        public async Task LogMsg()
        {
            Console.WriteLine(httpClient.BaseAddress);
        }

更新：删除 AddSignleton 行将起作用... 见评论link

Answer 1

can't get the base address in injected httpclient instance

尝试删除配置部分中的 AddSingleton<MyServicehttp>() 注册。

public class Startup : FunctionsStartup
   {
       public override void Configure(IFunctionsHostBuilder builder)
       {
           builder.Services.AddScoped<MyService>();
           builder.Services.AddScoped<Customlog>();
           //Removed AddSingleton in service registration
              //builder.Services.AddSingleton<MyServiceshttp>()    
              builder.Services.AddHttpClient<MyServicehttp>(client =>
           {
               // this code never runs
               client.BaseAddress = new Uri("https://api.github.com/");
           });
       }
   }

如果您想使用单例，请尝试在您的服务实例中注入 HttpClientFactory，例如 (MyServiceshttp).

参考here

在 Startup.cs 中键入客户端设置，无法在注入的服务中获取信息

typed client setup in Startup.cs, cannot get info in injected service

c#

httpclient

azure-functions