An unhandled exception occurred while processing the request

如果我们现在运行应用程序，我们将可能遇到一个异常：

An unhandled exception occurred while processing the request.

InvalidOperationException: Unable to resolve service for type 'ControllerDI.Interfaces.IDateTime' while attempting to activate 'ControllerDI.Controllers.HomeController'.
Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetService(IServiceProvider sp, Type type, Type requiredBy, Boolean isDefaultParameterRequired)

这个错误发生时，我们没有在我们的 Startup 类的 ConfigureServices 方法中配置服务。添加下面的服务到你的 ConfigureServices 方法中：

 public void ConfigureServices(IServiceCollection services)
        {
           // Add application services.
            services.AddScoped();
            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
        }