启动类选择
尾牙衣子 人气:0AspNet Core 多环境的配置方式有一种基于Startup类的选择。
- webBuilder.UseStartup() //显式注册、会靶定Startup.cs
- webBuilder.UseStartup(Assembly.GetExecutingAssembly().FullName); //多环境写法,根据环境变量选择基于约定名的类
还有其它两种方式这里不细说,配置多环境很明显不是采用显式注册。因此以下测试均采用方式二
尝试一:不同环境的优先级
public class Startup { public void ConfigureServices(IServiceCollection services) { IConfigurationRoot root = new ConfigurationBuilder().AddJsonFile("appsettings.Production.json").Build(); } public void Configure(IApplicationBuilder app, IWebHostEnvironment env) { } }
public class StartupProduction { public void ConfigureServices(IServiceCollection services) { IConfigurationRoot root = new ConfigurationBuilder().AddJsonFile("appsettings.Production.json").Build(); } public void Configure(IApplicationBuilder app, IWebHostEnvironment env) { } }
结论:很明显是环境变量优先
尝试二:不同命名空间下的优先级
public class Startup { public void ConfigureServices(IServiceCollection services) { IConfigurationRoot root = new ConfigurationBuilder().AddJsonFile("appsettings.Production.json").Build(); } public void Configure(IApplicationBuilder app, IWebHostEnvironment env) { } }
namespace Other { public class Startup { public void ConfigureServices(IServiceCollection services) { IConfigurationRoot root = new ConfigurationBuilder().AddJsonFile("appsettings.Production.json").Build(); } public void Configure(IApplicationBuilder app, IWebHostEnvironment env) { } } }
namespace AspnetCore { public class Startup { public void ConfigureServices(IServiceCollection services) { IConfigurationRoot root = new ConfigurationBuilder().AddJsonFile("appsettings.Production.json").Build(); } public void Configure(IApplicationBuilder app, IWebHostEnvironment env) { } } }
结论:无命名空间优先在情理之中,可任意命名空间竟然比当前的优先集要高,有些出人意料
后续
其一:多环境配置方式往小的说,还可以有基于配置文件的选择传送门,和基于配置方法的选择两种配置方式
其二:其它两种方式分别是
- webBuilder.Configure(app => {}) //注册一个DelegateStartup对象
- webBuilder.UseSetting("StartupAssembly", Assembly.GetEntryAssembly().FullName) //直接指定法
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