ASP.NET Core 3.1: Add framework service: IHostEnvironment-CodePudding

I have an asp.net core 3.1 application and I'm trying to inject the framework service IHostEnvironment in my ConfigureServices so I can get the environment in my application service and the application is throwing an error.

Startup.cs:

private IHostEnvironment _env;
public Startup(IConfiguration configuration, IHostEnvironment hostEnvironment)
{
Configuration = configuration;
_env = hostEnvironment;
}

public IConfiguration Configuration { get; }
public void ConfigureServices(IServiceCollection services)
{
//add framework services
services.AddSingleton<IHostEnvironment>(_env);

//add application services
services.AddSingleton<IMySvc, MySvc>();

}

MySvc.cs

public class MySvc : IMySvc
{
private IConfigurationRoot _config;
//private IHostingEnvironment _env;
private IHostEnvironment _env;

public string Env{
get{
if(_env.IsDevelopment()){return _config["MyConfiguration: MyProperty"];}
}
}
public HttpSvc(IConfigurationRoot config, IHostEnvironment env)
{
_config = config;
_env = env;
}

}

The application fails to run complaining about some services not being able to be constructed.

CodePudding user response：

As mentioned in the migration guide from 2.2 to 3.0 IWebHostEnvironment should be injected in the Startup class instead of IHostingEnvironment. Also I would suggest to consider injecting IConfiguration into service instead of IConfigurationRoot or even better consider to bind/register relevant config parts to some class and inject it (see Configuration in ASP.NET Core and Options pattern in ASP.NET Core )