\r\npublic class Program\r\n{\r\n public static void Main(string[] args)\r\n {\r\n BuildWebHost(args).Run();\r\n }\r\n\t\r\n public static IWebHost BuildWebHost(string[] args)\r\n {\r\n var webHost = new WebHostBuilder()\r\n\t .UseKestrel()\r\n\t .UseContentRoot(Directory.GetCurrentDirectory())\r\n\t .ConfigureAppConfiguration((hostingContext, config) =>\r\n\t {\r\n\t var env = hostingContext.HostingEnvironment;\r\n\t config.AddJsonFile(\"appsettings.json\", optional: true, reloadOnChange: true)\r\n\t .AddJsonFile($\"appsettings.{env.EnvironmentName}.json\", optional: true, reloadOnChange: true);\r\n\t config.AddEnvironmentVariables();\r\n\t config.AddCommandLine(args);\r\n\t }).UseStartup()\r\n\t .Build();\r\n return webHost;\r\n }\r\n}\r\n<\/pre>\nNow we can access our command-line arguments just like any other configuration<\/p>\n
\r\npublic class Startup\r\n{\r\n private readonly IConfiguration _configuration;\r\n\r\n public Startup(IConfiguration configuration)\r\n {\r\n _configuration = configuration;\r\n }\r\n\r\n \/\/ This method gets called by the runtime. Use this method to add services to the container.\r\n public void ConfigureServices(IServiceCollection services)\r\n {\r\n services.AddMvc();\r\n }\r\n\r\n \/\/ This method gets called by the runtime. Use this method to configure the HTTP request pipeline.\r\n public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory, IApplicationLifetime applicationLifetime)\r\n {\r\n loggerFactory.AddConsole();\r\n loggerFactory.AddDebug();\r\n applicationLifetime.ApplicationStarted.Register(() => loggerFactory.CreateLogger().LogInformation(\"CommandLine argument {0}: \", _configuration[\"usecustomschema\"]));\r\n if (env.IsDevelopment())\r\n {\r\n app.UseDeveloperExceptionPage();\r\n }\r\n\r\n app.UseMvc();\r\n }\r\n}\r\n<\/pre>\n![\"\"](\"\/\/tpodolak.com\/blog\/wp-content\/uploads\/2018\/01\/asp-net-core-passing-command-line-arguments-to-startup-class\/AspNetCore2CommandLineArgument-1.png\")
<\/a><\/p>\n3. ASP.NET Core 1.x <\/h3>\n
The solution for ASP.NET Core 1.x<\/i> requires a bit more work but it is possible to achieve the same result. We still will be using CommandLineConfigurationSource<\/i> from Microsoft.Extensions.Configuration.CommandLine<\/i> package, however this time we have to manually create IConfiguration<\/i> object and register it in the container before the Startup<\/i> class is created. This is possible because the WebHostBuilder<\/i> exposes ConfigureServices<\/i> method.<\/p>\n\r\npublic class Program\r\n{\r\n public static void Main(string[] args)\r\n {\r\n var host = new WebHostBuilder()\r\n .UseKestrel()\r\n .UseContentRoot(Directory.GetCurrentDirectory())\r\n UseIISIntegration()\r\n .ConfigureServices(serviceCollection =>\r\n serviceCollection.AddSingleton(new ConfigurationBuilder().AddCommandLine(args).Build()))\r\n .UseStartup()\r\n .Build();\r\n\r\n host.Run();\r\n }\r\n}\r\n<\/pre>\nHaving our service registered now we can easily access IConfiguration<\/i> object in our application<\/p>\n\r\npublic class Startup\r\n{\r\n \/\/ This method gets called by the runtime. Use this method to add services to the container.\r\n public void ConfigureServices(IServiceCollection services)\r\n {\r\n \/\/ Add framework services.\r\n services.AddMvc();\r\n }\r\n\r\n \/\/ This method gets called by the runtime. Use this method to configure the HTTP request pipeline.\r\n public void Configure(IApplicationBuilder app, IHostingEnvironment hostingEnvironment, IConfiguration configuration, ILoggerFactory loggerFactory, IApplicationLifetime applicationLifetime)\r\n {\r\n loggerFactory.AddConsole();\r\n loggerFactory.AddDebug();\r\n applicationLifetime.ApplicationStarted.Register(() =>\r\n loggerFactory.CreateLogger().LogInformation(\"CommandLine argument {0}: \", configuration[\"usecustomschema\"]));\r\n\r\n if (hostingEnvironment.IsDevelopment())\r\n {\r\n app.UseDeveloperExceptionPage();\r\n }\r\n\r\n app.UseMvc();\r\n }\r\n}\r\n<\/pre>\n![\"\"](\"\/\/tpodolak.com\/blog\/wp-content\/uploads\/2018\/01\/asp-net-core-passing-command-line-arguments-to-startup-class\/AspNetCoreCommandLineArgument-1.png\")
<\/a>
\nSource code for this post can be found here<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"1. Introduction I usually pass configuration to my web API via JSON files, but recently I needed to pass them also via command-line arguments. As the solution for ASP.NET Core 2.x is quite different than for ASP.NET Core 1.x I decided to describe both methods in here. 2. ASP.NET Core 2.x For the newest version […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[317],"tags":[318],"class_list":["post-1303","post","type-post","status-publish","format-standard","hentry","category-asp-net-core","tag-asp-net-core"],"_links":{"self":[{"href":"https:\/\/tpodolak.com\/blog\/wp-json\/wp\/v2\/posts\/1303","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tpodolak.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tpodolak.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tpodolak.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tpodolak.com\/blog\/wp-json\/wp\/v2\/comments?post=1303"}],"version-history":[{"count":4,"href":"https:\/\/tpodolak.com\/blog\/wp-json\/wp\/v2\/posts\/1303\/revisions"}],"predecessor-version":[{"id":1311,"href":"https:\/\/tpodolak.com\/blog\/wp-json\/wp\/v2\/posts\/1303\/revisions\/1311"}],"wp:attachment":[{"href":"https:\/\/tpodolak.com\/blog\/wp-json\/wp\/v2\/media?parent=1303"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tpodolak.com\/blog\/wp-json\/wp\/v2\/categories?post=1303"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tpodolak.com\/blog\/wp-json\/wp\/v2\/tags?post=1303"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}