asp.net-core 配置多个环境
示例
本示例说明如何在一个Startup类中使用不同的依赖注入配置和单独的中间件配置多个环境。
除了中和方法可以使用，并有环境相关的配置。publicvoidConfigure(IApplicationBuilderapp)publicvoidConfigureServices(IServiceCollectionservices)Configure{EnvironmentName}Configure{EnvironmentName}Services
使用这种模式可以避免if/else在一个方法/Startup类中增加太多逻辑，并保持其清洁和分离。
public class Startup
{
public void ConfigureServices(IServiceCollection services) { }
public void ConfigureStaggingServices(IServiceCollection services) { }
public void ConfigureProductionServices(IServiceCollection services) { }
public void Configure(IApplicationBuilder app) { }
public void ConfigureStagging(IApplicationBuilder app) { }
public void ConfigureProduction(IApplicationBuilder app) { }
}当找不到Configure{Environmentname}或时Configure{Environmentname}Services，它将分别回落到Configure或ConfigureServices。
相同的语义也适用于Startup该类。StartupProduction将在ASPNETCORE_ENVIRONMENT变量设置为时使用，并在变量为或时Production回退StartupStaggingDevelopment
一个完整的例子：
public class Startup
{
public Startup(IHostingEnvironment hostEnv)
{
//设置配置源。
var builder = new ConfigurationBuilder()
.SetBasePath(hostEnv.ContentRootPath)
.AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
.AddJsonFile($"appsettings.{hostEnv.EnvironmentName}.json", optional: true, reloadOnChange: true);
if (hostEnv.IsDevelopment())
{
//这将使遥测数据更快地通过ApplicationInsights管道推送，从而使您可以立即查看结果。
builder.AddApplicationInsightsSettings(developerMode: true);
}
builder.AddEnvironmentVariables();
Configuration = builder.Build();
}
public IConfigurationRoot Configuration { get; set; }
//运行时将调用此方法。使用此方法向容器添加服务
public static void RegisterCommonServices(IServiceCollection services)
{
services.AddScoped<ICommonService, CommonService>();
services.AddScoped<ICommonRepository, CommonRepository>();
}
public void ConfigureServices(IServiceCollection services)
{
RegisterCommonServices(services);
services.AddOptions();
services.AddMvc();
}
public void ConfigureDevelopment(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
loggerFactory.AddConsole(Configuration.GetSection("Logging"));
loggerFactory.AddDebug();
app.UseBrowserLink();
app.UseDeveloperExceptionPage();
app.UseApplicationInsightsRequestTelemetry();
app.UseApplicationInsightsExceptionTelemetry();
app.UseStaticFiles();
app.UseMvc();
}
//此配置中没有控制台记录器和调试工具
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
loggerFactory.AddDebug();
app.UseApplicationInsightsRequestTelemetry();
app.UseApplicationInsightsExceptionTelemetry();
app.UseStaticFiles();
app.UseMvc();
}
}