• .NET Core Container Images now Published to Microsoft Container Registry

      We are now publishing .NET Core container images to Microsoft Container Registry (MCR). We have also made other changes to the images we publish, described in this post.


      Important: You will need to change FROM statements in Dockerfile files and docker pull commands as a result of these changes. 3.0 references need to be changed now. Most 1.x and 2.x usages can be changed over time. The new tag scheme is decribed in this post and are provided at the microsoft-dotnet-core repo, our new home on Docker Hub.


      Summary of changes:


      • .NET Core images are now published to Microsoft Container Registry.
      • Updates will continue to be published to Docker Hub, for .NET Core 1.x and 2.x.
      • .NET Core 3.0 will only be published to MCR.
      • Nano Server 2016 images are no longer supported or published.

      image
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    • Disposable pattern (Disposable Design Principle) pt.1


        Disposable pattern (Disposable Design Principle)


        I guess almost any programmer who uses .NET will now say this pattern is a piece of cake. That it is the best-known pattern used on the platform. However, even the simplest and well-known problem domain will have secret areas which you have never looked at. So, let’s describe the whole thing from the beginning for the first-timers and all the rest (so that each of you could remember the basics). Don’t skip these paragraphs — I am watching you!


        If I ask what is IDisposable, you will surely say that it is


        public interface IDisposable
        {
            void Dispose();
        }

        What is the purpose of the interface? I mean, why do we need to clear up memory at all if we have a smart Garbage Collector that clears the memory instead of us, so we even don’t have to think about it. However, there are some small details.


        This charper translated from Russian as from language of author by professional translators. You can help us with creating translated version of this text to any other language including Chinese or German using Russian and English versions of text as source.

        Also, if you want to say «thank you», the best way you can choose is giving us a star on github or forking repository https://github.com/sidristij/dotnetbook
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      • Memory and Span pt.1

          Starting from .NET Core 2.0 and .NET Framework 4.5 we can use new data types: Span and Memory. To use them, you just need to install the System.Memory nuget package:


          PM> Install-Package System.Memory

          These data types are notable because the CLR team has done a great job to implement their special support inside the code of .NET Core 2.1+ JIT compiler by embedding these data types right into the core. What kind of data types are these and why are they worth a whole chapter?


          If we talk about problems that made these types appear, I should name three of them. The first one is unmanaged code.


          Both the language and the platform have existed for many years along with means to work with unmanaged code. So, why release another API to work with unmanaged code if the former basically existed for many years? To answer this question, we should understand what we lacked before.


          This chapter was translated from Russian jointly by author and by professional translators. You can help us with translation from Russian or English into any other language, primarily into Chinese or German.

          Also, if you want thank us, the best way you can do that is to give us a star on github or to fork repository github/sidristij/dotnetbook.
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        • Universal C# Code for NET and JavaScript

          • Translation

          In 2013, while working at GFRANQ photo service, I participated in the development of an eponymous web service for publishing and processing photos. Filters and transformations were defined in the file with parameters, and all processing was carried out on the server. During service development, there was a need to support these transformations on the client side for the preview. According to Larry Wall, one of the virtues of a programmer is laziness. Therefore, as truly lazy programmers, we thought about the possibility of using the same code on both the server and client sides. The entire development was conducted in C#. After researching the libraries and a couple of attempts, we proudly concluded that this was possible and began to write the universal code.



          Why is this article needed? Indeed, 6 years have passed since 2013, and many technologies have lost their relevance, for example, Script#. On the other hand, new ones have appeared. For example, Bridge.NET or Blazor based on the fancy WebAssembly.


          Nevertheless, some ideas can still be used. In this article I tried to describe them as detailed as possible. I hope that the mention of Silverlight and Flash will cause a smile with a hint of nostalgia, and not a desire to criticize the old solutions. Anyway, they have contributed to the development of the web industry.

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        • Generating multi-brand multi-platform icons with Sketch and a Node.js script — Part #2



            This is the second part of a post about the creation of a pipeline that can take a Sketch file and export all the icons included in the file, in different formats, for different platforms, with the possibility of AB testing each icon.

            You can read the first part of the post here.



            The Sketch files, with all the icons collected, styled and properly named, were ready. Now it was time to start writing the code.

            Suffice to say, the process was very much a trial and error: after the important initial code core, developed by my team lead Nikhil Verma (who set the script foundations), I went through an incremental process that required at least three phases of refactoring and quite a few revisions. For this reason, I won’t go into too much detail on how the script was developed, but rather focus on how the script works today, in its final shape.
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          • .NET Reference Types vs Value Types. Part 2


              The Object base type and implementation of interfaces. Boxing


              It seems we came through hell and high water and can nail any interview, even the one for .NET CLR team. However, let's not rush to microsoft.com and search for vacancies. Now, we need to understand how value types inherit an object if they contain neither a reference to SyncBlockIndex, not a pointer to a virtual methods table. This will completely explain our system of types and all pieces of a puzzle will find their places. However, we will need more than one sentence.


              Now, let's remember again how value types are allocated in memory. They get the place in memory right where they are. Reference types get allocation on the heap of small and large objects. They always give a reference to the place on the heap where the object is. Each value type has such methods as ToString, Equals and GetHashCode. They are virtual and overridable, but don’t allow to inherit a value type by overriding methods. If value types used overridable methods, they would need a virtual methods table to route calls. This would lead to the problems of passing structures to unmanaged world: extra fields would go there. As a result, there are descriptions of value type methods somewhere, but you cannot access them directly via a virtual methods table.


              This may bring the idea that the lack of inheritance is artificial


              This chapter was translated from Russian jointly by author and by professional translators. You can help us with translation from Russian or English into any other language, primarily into Chinese or German.

              Also, if you want thank us, the best way you can do that is to give us a star on github or to fork repository github/sidristij/dotnetbook.
              Read more →
            • Blazor 0.8.0 experimental release now available

                Blazor 0.8.0 is now available! This release updates Blazor to use Razor Components in .NET Core 3.0 and adds some critical bug fixes.


                Get Blazor 0.8.0


                To get started with Blazor 0.8.0 install the following:


                1. .NET Core 3.0 Preview 2 SDK (3.0.100-preview-010184)
                2. Visual Studio 2019 (Preview 2 or later) with the ASP.NET and web development workload selected.
                3. The latest Blazor extension from the Visual Studio Marketplace.
                4. The Blazor templates on the command-line:


                  dotnet new -i Microsoft.AspNetCore.Blazor.Templates::0.8.0-preview-19104-04

                You can find getting started instructions, docs, and tutorials for Blazor at https://blazor.net.

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