{"id":25268523,"url":"https://github.com/vmandic/custom-iconfiguration-startup-injection","last_synced_at":"2026-04-16T00:31:33.049Z","repository":{"id":84267849,"uuid":"324651580","full_name":"vmandic/custom-iconfiguration-startup-injection","owner":"vmandic","description":"This is a sample #dotnetcore project demonstrating on how to modify the IConfiguration injected in generic host Startup.cs 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unexpected eof while reading","robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":false,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["configuration","csharp","dependency-injection","dotnet","dotnetcore","webapi","webapp"],"created_at":"2025-02-12T10:29:53.494Z","updated_at":"2026-04-16T00:31:33.038Z","avatar_url":"https://github.com/vmandic.png","language":"C#","funding_links":[],"categories":[],"sub_categories":[],"readme":"# How to modify the IConfiguration injected into Startup constructor\n\nThis is a sample #dotnetcore project demonstrating on how to modify the IConfiguration injected in generic host Startup.cs CTOR.\n\nThe core thing to do is to call the `ConfigureAppConfiguration` in generic host construction as followed:\n\n```csharp\npublic class Program\n  {\n    private static IConfigurationBuilder ConfigurationBuilder;\n    public static async Task Main(string[] args)\n    {\n      ConfigurationBuilder = new ConfigurationBuilder()\n        .SetBasePath(Directory.GetCurrentDirectory())\n        .AddJsonFile(\"appsettings.json\", optional : false)\n        .AddJsonFile($\"appsettings.{Environment.GetEnvironmentVariable(\"ASPNETCORE_ENVIRONMENT\")}.json\", optional : true)\n        .AddJsonFile(\"appsettings.localhost.json\", optional : true)\n        .AddEnvironmentVariables();\n\n      await CreateHostBuilder(args).Build().RunAsync();\n    }\n\n    public static IHostBuilder CreateHostBuilder(string[] args)\n    {\n      return Host.CreateDefaultBuilder(args)\n        .UseContentRoot(Directory.GetCurrentDirectory())\n        .ConfigureAppConfiguration(configBuilder =\u003e\n        {\n          Console.WriteLine(\"ConfigureAppConfiguration called...\");\n\n          // NOTE: this does not work, we will have to reassign one by one in foreach below\n          //configBuilder = ConfigurationBuilder; \n          \n          // NOTE: clear existing stack built by CreateDefaultBuilder method\n          configBuilder.Sources.Clear();\n\n          foreach (var configSource in ConfigurationBuilder.Sources)\n          {\n            configBuilder.Add(configSource);\n          }\n        })\n        .ConfigureWebHostDefaults(webBuilder =\u003e\n          webBuilder.UseStartup\u003cStartup\u003e());\n    }\n  }\n```\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fvmandic%2Fcustom-iconfiguration-startup-injection","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fvmandic%2Fcustom-iconfiguration-startup-injection","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fvmandic%2Fcustom-iconfiguration-startup-injection/lists"}