如何在启动中的ConfigureServices方法中获得开发/登台/生产托管环境?
public void ConfigureServices(IServiceCollection services)
{
// Which environment are we running under?
}
ConfigureServices方法只接受一个IServiceCollection参数。
如何在启动中的ConfigureServices方法中获得开发/登台/生产托管环境?
public void ConfigureServices(IServiceCollection services)
{
// Which environment are we running under?
}
ConfigureServices方法只接受一个IServiceCollection参数。
当前回答
在. net Core 2.0 MVC app / Microsoft.AspNetCore.All v2.0.0中,你可以有@vaindil所描述的特定于环境的启动类,但我不喜欢这种方法。
你也可以在StartUp构造函数中注入IHostingEnvironment。不需要将环境变量存储在Program类中。
public class Startup
{
private readonly IHostingEnvironment _currentEnvironment;
public IConfiguration Configuration { get; private set; }
public Startup(IConfiguration configuration, IHostingEnvironment env)
{
_currentEnvironment = env;
Configuration = configuration;
}
public void ConfigureServices(IServiceCollection services)
{
......
services.AddMvc(config =>
{
// Requiring authenticated users on the site globally
var policy = new AuthorizationPolicyBuilder()
.RequireAuthenticatedUser()
.Build();
config.Filters.Add(new AuthorizeFilter(policy));
// Validate anti-forgery token globally
config.Filters.Add(new AutoValidateAntiforgeryTokenAttribute());
// If it's Production, enable HTTPS
if (_currentEnvironment.IsProduction()) // <------
{
config.Filters.Add(new RequireHttpsAttribute());
}
});
......
}
}
其他回答
你可以很容易地在ConfigureServices中访问它,只是在Startup方法期间将它持久化到一个属性,该方法首先被调用并将其传递进来,然后你可以从ConfigureServices访问该属性。
public Startup(IWebHostEnvironment env, IApplicationEnvironment appEnv)
{
...your code here...
CurrentEnvironment = env;
}
private IWebHostEnvironment CurrentEnvironment{ get; set; }
public void ConfigureServices(IServiceCollection services)
{
string envName = CurrentEnvironment.EnvironmentName;
... your code here...
}
这可以在没有任何额外属性或方法参数的情况下完成,如下所示:
public void ConfigureServices(IServiceCollection services)
{
IServiceProvider serviceProvider = services.BuildServiceProvider();
IHostingEnvironment env = serviceProvider.GetService<IHostingEnvironment>();
if (env.IsProduction()) DoSomethingDifferentHere();
}
来自文档
Configure和ConfigureServices支持特定环境的版本 配置{EnvironmentName}和配置{EnvironmentName}形式的服务:
你可以这样做……
public void ConfigureProductionServices(IServiceCollection services)
{
ConfigureCommonServices(services);
//Services only for production
services.Configure();
}
public void ConfigureDevelopmentServices(IServiceCollection services)
{
ConfigureCommonServices(services);
//Services only for development
services.Configure();
}
public void ConfigureStagingServices(IServiceCollection services)
{
ConfigureCommonServices(services);
//Services only for staging
services.Configure();
}
private void ConfigureCommonServices(IServiceCollection services)
{
//Services common to each environment
}
另一种方法是使用configuration ["ASPNETCORE_ENVIRONMENT"]直接从配置中读取环境名称。这适用于任何可以访问配置的地方。
public IConfiguration Configuration { get; }
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public void ConfigureServices(IServiceCollection services)
{
Console.WriteLine(Configuration["ASPNETCORE_ENVIRONMENT"]);
}
前提条件是主机是用program .cs中的host . createdefaultbuilder()创建的,这是ASP. cs的默认值。NET Core 3.0(和5.0)web应用程序。如果使用其他构建器,则可以使用program .cs中的AddEnvironmentVariables()添加envars。
宿主环境来自ASPNET_ENV环境变量,在启动过程中使用IHostingEnvironment可用。IsEnvironment扩展方法,或IsDevelopment或IsProduction中相应的方便方法之一。在Startup()中保存你需要的东西,或者在ConfigureServices调用中保存:
var foo = Environment.GetEnvironmentVariable("ASPNET_ENV");