dotnetomaniak.pl - Artykuły z tagiem Covariancedotnetomaniak.pl - Artykuły z tagiem Covariance2024-03-29T12:36:06Zhttps://dotnetomaniak.pl/Tags/CovarianceCopyright (c) dotnetomaniak.pldotnetomaniak.pl Atom Generatordotnetomaniak.pl webmasteradmin@dotnetomaniak.plhttps://dotnetomaniak.pl/Assets/Images/fav.icohttps://dotnetomaniak.pl/Assets/Images/dotnetomaniak_logo-negatyw_small.png4025https://dotnetomaniak.pl/Cannot-implicitly-convert-type-Abc-to-IAbc-Contravariance-vs-Covariance-part-2-A-Girl-Among-GeeksCannot implicitly convert type ‘Abc’ to ‘IAbc’ – Contravariance vs Covariance – part 2. – A Girl Among Geeks2019-06-03T22:58:31Z<div><div><div style="float:right"><img alt ="" src="http://dotnetomaniak.pl/Data/Thumbnails/small_2GBwFoippE2Mk5Q1Hjg7mg.png"/></div><div>Today I will write about the way variance influences type checking in C#. Yes, the fact that one type can be passed to a generic method that requires another type, depends on these 2 small keywords we write before ‘T’ (or whatever 😉) in interface header.</div></div><div style="padding-top:4px"><a rev="vote-for" href="https://dotnetomaniak.pl/Cannot-implicitly-convert-type-Abc-to-IAbc-Contravariance-vs-Covariance-part-2-A-Girl-Among-Geeks"><img alt="Podbij ↑" src="https://dotnetomaniak.pl/image.axd?url=https%3a%2f%2fagirlamonggeeks.com%2f2019%2f06%2f04%2fcannot-implicitly-convert-type-abc-to-iabc-contravariance-vs-covariance-part-2%2f" style="border:0px"/></a></div></div>AGirlAmongGeekshttps://dotnetomaniak.pl/Users/BR4sTPFFt06GUon4bGbBcQ2019-06-04T05:47:43Zhttps://dotnetomaniak.pl/Cannot-implicitly-convert-type-Abc-to-IAbc-Contravariance-vs-Covariance-part-2-A-Girl-Among-Geeks1960Today I will write about the way variance influences type checking in C#. Yes, the fact that one type can be passed to a generic method that requires another type, depends on these 2 small keywords we write before ‘T’ (or whatever 😉) in interface header.https://agirlamonggeeks.com/2019/06/04/cannot-implicitly-convert-type-abc-to-iabc-contravariance-vs-covariance-part-2/http://dotnetomaniak.pl/Data/Thumbnails/small_2GBwFoippE2Mk5Q1Hjg7mg.pnghttps://dotnetomaniak.pl/vs-Contravariance-vs-Covariance-the-easier-part-1-A-Girl-Among-Geeks<in T> vs <out T> - Contravariance vs Covariance – (the easier) part 1. – A Girl Among Geeks2019-05-28T23:46:59Z<div><div><div style="float:right"><img alt ="" src="http://dotnetomaniak.pl/Data/Thumbnails/small_9iQx25bys0WFe44PVNPQUQ.png"/></div><div>Have you ever seen these mysterious ‘in’ and ‘out’ keywords in generic interfaces’ definitions? If so, you’ve probably already checked what it means, but if not… You better read this and the next post. So today we will talk about the basics of variance in our own generic interfaces.</div></div><div style="padding-top:4px"><a rev="vote-for" href="https://dotnetomaniak.pl/vs-Contravariance-vs-Covariance-the-easier-part-1-A-Girl-Among-Geeks"><img alt="Podbij ↑" src="https://dotnetomaniak.pl/image.axd?url=https%3a%2f%2fagirlamonggeeks.com%2f2019%2f05%2f29%2fvs-in-generic-interfaces-contravariance-vs-covariance-the-easier-part-1%2f" style="border:0px"/></a></div></div>AGirlAmongGeekshttps://dotnetomaniak.pl/Users/BR4sTPFFt06GUon4bGbBcQ2019-05-29T05:56:36Zhttps://dotnetomaniak.pl/vs-Contravariance-vs-Covariance-the-easier-part-1-A-Girl-Among-Geeks11220Have you ever seen these mysterious ‘in’ and ‘out’ keywords in generic interfaces’ definitions? If so, you’ve probably already checked what it means, but if not… You better read this and the next post. So today we will talk about the basics of variance in our own generic interfaces.https://agirlamonggeeks.com/2019/05/29/vs-in-generic-interfaces-contravariance-vs-covariance-the-easier-part-1/http://dotnetomaniak.pl/Data/Thumbnails/small_9iQx25bys0WFe44PVNPQUQ.pnghttps://dotnetomaniak.pl/What-are-covariance-and-contravariance-in-C-Forever-FrameWhat are covariance and contravariance in C#? - Forever F[r]ame2016-12-05T21:48:34Z<div><div><div style="float:right"><img alt ="" src="http://dotnetomaniak.pl/Data/Thumbnails/small_7aD0ieWZWkycFokkyBwJDQ.png"/></div><div>Sometimes it happens that we use mechanisms/features of specific language without beeing aware of it. That’s fine, but if you’ll want to discuss your code in a future to the audience or coworkers, soon or later you’ll be forced to learn it and understand (or at least name it using technical nomenclature). Therefore, today I’m going to discuss two related „mechanisms” of C# which are covariance and contravariance.
Covariance
Covariance is a type conversion from the specific type to the more general (ba...</div></div><div style="padding-top:4px"><a rev="vote-for" href="https://dotnetomaniak.pl/What-are-covariance-and-contravariance-in-C-Forever-Frame"><img alt="Podbij ↑" src="https://dotnetomaniak.pl/image.axd?url=http%3a%2f%2fforeverframe.pl%2fwhat-are-covariance-and-contravariance-in-c%2f" style="border:0px"/></a></div></div>dpawlukiewiczhttps://dotnetomaniak.pl/Users/3F7LM514EkOFPklktIOrVg2016-12-15T17:59:08Zhttps://dotnetomaniak.pl/What-are-covariance-and-contravariance-in-C-Forever-Frame51870Sometimes it happens that we use mechanisms/features of specific language without beeing aware of it. That’s fine, but if you’ll want to discuss your code in a future to the audience or coworkers, soon or later you’ll be forced to learn it and understand (or at least name it using technical nomenclature). Therefore, today I’m going to discuss two related „mechanisms” of C# which are covariance and contravariance.
Covariance
Covariance is a type conversion from the specific type to the more general (ba...http://foreverframe.pl/what-are-covariance-and-contravariance-in-c/http://dotnetomaniak.pl/Data/Thumbnails/small_7aD0ieWZWkycFokkyBwJDQ.pnghttps://dotnetomaniak.pl/dabrozscythepl-Nowo%C5%9Bci-w-C-40dabroz.scythe.pl » Nowości w C# 4.02009-04-24T09:43:53Z<div><div><div style="float:right"><img alt ="" src="http://dotnetomaniak.pl/Data/Thumbnails/small_kosvHrLQkEWQ8MzkGT6Wtw.png"/></div><div>Niedługo dostępny będzie C# 4.0. Z ciekawych rzeczy, które mają wprowadzić:dynamic - ciekawy, aczkolwiek niepokojący feature. W skrócie - dostaniemy typy nieokreślone z możliwością wywoływania na nich dowolnych metod, które będą bindowane dopiero w czasie wykonywania (w przypadku klas .NET-owych; dla obiektów COM i obiektów z interfejsem IDynamicObject magia jest jeszcze głębsza)...</div></div><div style="padding-top:4px"><a rev="vote-for" href="https://dotnetomaniak.pl/dabrozscythepl-Nowo%C5%9Bci-w-C-40"><img alt="Podbij ↑" src="https://dotnetomaniak.pl/image.axd?url=http%3a%2f%2fdabroz.scythe.pl%2f2009%2f03%2f03%2fnowosci-w-csharp-40" style="border:0px"/></a></div></div>mackohttps://dotnetomaniak.pl/Users/n6HrySbCMkGkdWWjKfFEFA2009-05-03T14:55:30Zhttps://dotnetomaniak.pl/dabrozscythepl-Nowo%C5%9Bci-w-C-4043020Niedługo dostępny będzie C# 4.0. Z ciekawych rzeczy, które mają wprowadzić:dynamic - ciekawy, aczkolwiek niepokojący feature. W skrócie - dostaniemy typy nieokreślone z możliwością wywoływania na nich dowolnych metod, które będą bindowane dopiero w czasie wykonywania (w przypadku klas .NET-owych; dla obiektów COM i obiektów z interfejsem IDynamicObject magia jest jeszcze głębsza)...http://dabroz.scythe.pl/2009/03/03/nowosci-w-csharp-40http://dotnetomaniak.pl/Data/Thumbnails/small_kosvHrLQkEWQ8MzkGT6Wtw.png