{"id":23740210,"url":"https://github.com/mustaddon/contravariancedependencyinjection","last_synced_at":"2026-02-04T09:03:16.295Z","repository":{"id":258996045,"uuid":"876131974","full_name":"mustaddon/ContravarianceDependencyInjection","owner":"mustaddon","description":"Contravariant and Covariant injection for Microsoft.Extensions.DependencyInjection","archived":false,"fork":false,"pushed_at":"2024-11-20T07:22:43.000Z","size":527,"stargazers_count":0,"open_issues_count":0,"forks_count":0,"subscribers_count":1,"default_branch":"main","last_synced_at":"2025-07-10T13:06:10.964Z","etag":null,"topics":["contravariance","contravariance-dependency-injection","contravariance-di","contravariant","covariance","covariant","dependency-injection","dependency-injection-container","proxy-pattern","service-collection","service-provider","virtual-proxy"],"latest_commit_sha":null,"homepage":"","language":"C#","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"mit","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/mustaddon.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null}},"created_at":"2024-10-21T13:02:37.000Z","updated_at":"2024-11-20T07:24:26.000Z","dependencies_parsed_at":"2024-11-20T08:19:33.755Z","dependency_job_id":"c63cdd19-7be6-4ede-9e59-01e8b0039ada","html_url":"https://github.com/mustaddon/ContravarianceDependencyInjection","commit_stats":null,"previous_names":["mustaddon/contravariancedependencyinjection"],"tags_count":0,"template":false,"template_full_name":null,"purl":"pkg:github/mustaddon/ContravarianceDependencyInjection","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/mustaddon%2FContravarianceDependencyInjection","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/mustaddon%2FContravarianceDependencyInjection/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/mustaddon%2FContravarianceDependencyInjection/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/mustaddon%2FContravarianceDependencyInjection/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/mustaddon","download_url":"https://codeload.github.com/mustaddon/ContravarianceDependencyInjection/tar.gz/refs/heads/main","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/mustaddon%2FContravarianceDependencyInjection/sbom","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":265738572,"owners_count":23820167,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","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":["contravariance","contravariance-dependency-injection","contravariance-di","contravariant","covariance","covariant","dependency-injection","dependency-injection-container","proxy-pattern","service-collection","service-provider","virtual-proxy"],"created_at":"2024-12-31T09:47:29.426Z","updated_at":"2026-02-04T09:03:16.232Z","avatar_url":"https://github.com/mustaddon.png","language":"C#","funding_links":[],"categories":[],"sub_categories":[],"readme":"# ContravarianceDependencyInjection [![NuGet version](https://badge.fury.io/nu/ContravarianceDependencyInjection.svg?7)](http://badge.fury.io/nu/ContravarianceDependencyInjection)\nContravariant and Covariant injection for Microsoft.Extensions.DependencyInjection using the [Proxy pattern](https://en.wikipedia.org/wiki/Proxy_pattern).\n\n### Example\n```C#\ninterface IExampleContravariant\u003cin T\u003e\n{\n    object? MyMethod(T request);\n}\n```\n```C#\nvar services = new ServiceCollection()\n    .AddTransient\u003cIExampleContravariant\u003cContractBase\u003e, ExampleService\u003cContractBase\u003e\u003e()\n    .AddTransient\u003cIExampleContravariant\u003cContractAB\u003e, ExampleService\u003cContractAB\u003e\u003e()\n    .AddTransient\u003cIExampleContravariant\u003cContractA\u003e, ExampleService\u003cContractA\u003e\u003e()\n\n    // REQUIRED: Adds contravariance injection for registred services IExampleContravariant\n    .AddContravariance(typeof(IExampleContravariant\u003c\u003e), SearchStrategy.MaxCloser)\n\n    .BuildServiceProvider();\n\n\n// inheritance example contracts\n// ContractBase -\u003e ContractA -\u003e ContractAB -\u003e ContractABC\n// ContractBase -\u003e ContractB\n\n\n// IExampleContravariant\u003cContractABC\u003e is not registered,\n// IExampleContravariant\u003cContractAB\u003e is invoked instead \nConsole.WriteLine(\"  Result: \" +\n    services.GetRequiredService\u003cIExampleContravariant\u003cContractABC\u003e\u003e()\n        .MyMethod(new ContractABC()));\n\n\n// IExampleContravariant\u003cContractB\u003e is not registered,\n// IExampleContravariant\u003cContractBase\u003e is invoked instead \nConsole.WriteLine(\"  Result: \" +\n    services.GetRequiredService\u003cIExampleContravariant\u003cContractB\u003e\u003e()\n        .MyMethod(new ContractB()));\n```\n\n[Program.cs](https://github.com/mustaddon/ContravarianceDependencyInjection/blob/main/Example/Program.cs)\n\n### Concept\n\u003c!-- [![](https://raw.githubusercontent.com/mustaddon/ContravarianceDependencyInjection/master/dgrm.png)](https://app.dgrm.net/?u=https://raw.githubusercontent.com/mustaddon/ContravarianceDependencyInjection/master/dgrm.png) --\u003e\n[\u003cimg src=\"https://raw.githubusercontent.com/mustaddon/ContravarianceDependencyInjection/master/dgrm.png\" width=\"600\" /\u003e](https://app.dgrm.net/?u=https://raw.githubusercontent.com/mustaddon/ContravarianceDependencyInjection/master/dgrm.png)\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fmustaddon%2Fcontravariancedependencyinjection","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fmustaddon%2Fcontravariancedependencyinjection","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fmustaddon%2Fcontravariancedependencyinjection/lists"}