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C# 9: Partial Method Enhancements for Source Generators
Source Generators in C# 9 will allow compiler-extensions to inspect code and then inject additional source code at compile-time. This injected code is then incorporated into the very same assembly that was being compiled. In order to facilitate this capability, Microsoft is removing most of the restrictions on Partial Methods.
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C# 9: towards First Class Support for Scripting
One of the defining characteristics of “scripting” languages is they don’t need any boilerplate. The very first line of a file can be the declarations and statements you would normally see inside a function. In the updated Top-level statements proposal, this capability is planned for C# 9.
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Fabulous Enables Building Declarative Cross-Platforms UIs for iOS and Android in F#
In a recent Channel 9 show, F# designer and architect Don Syme and Fabulous maintainer Timothé Larivière introduced Fabulous, a community-driven F# framework aimed to build cross-platform mobile and desktop apps based on Xamarin.Forms.
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Source Generators Will Enable Compile-Time Metaprogramming in C# 9
Source generators are a new feature of the C# compiler that enables inspecting user code using compiler-generated metadata and generating additional source files to be compiled along with the rest of the program.
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C# Static Analysis Tool Roslynator.Analyzers Now Has over 500 Ways to Improve Code
The new version 2.3.1 of the Roslynator.Analyzers package brings the number of analyzers, refactorings and fixes to over 500. Roslynator uses the open-source Roslyn .NET Compiler Platform to perform static analysis on your C# code. This analysis drives your IDE to display hints and actions to improve your code.
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C# Futures: Primary Constructors
We last mentioned primary constructors in 2014 when it was removed from the candidate list for C# 6 and VB 12. Late last year, Primary Constructors reappeared as a candidate for C# 9.
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C# Futures: Covariant Return Types
A frequent API design problem is the inability to use a more specific return type when overriding a method. Proposal 49, which is now a C# 9 candidate, seeks to correct this issue.
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C# Futures: Simplified Parameter Null Validation
At first glance, proposal #2145 seems like a logical extension to C# 8’s Nullable Reference Types feature. The basic idea is developers would no longer need to explicitly add argument null checks to methods that accept non-nullable parameters. However, this has become quite contentious.
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C# 9 Proposals: Module Initializers
The module initializer proposal has been promoted to C# 9 candidacy. This would act like a static constructor in C#, but rather than applying to one class it applies to the entire assembly.
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Bolero Enables Writing F# Apps Running in WebAssembly Using Blazor
Bolero makes it possible to build WebAssembly apps in F#. Bolero leverages Blazor Microsoft technology, to enable running C# in the browser.
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Stateful Programming Models in Serverless Functions: Chris Gillum at QCon San Francisco
Chris Gillum, principal engineering manager at Microsoft, presented at QCon San Francisco on Serverless Programming Models in Azure Functions. In his presentation, he discussed two stateful programming models, workflow and actors on Azure Functions - Microsoft’s implementation of serverless compute.
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A Proposal for IDisposable and Static Analysis: DisposeUnused Attribute
When .NET was first created, there was uncertainty about how IDisposable should be used. As a result, IDisposable was applied in an overly aggressive fashion with many categories of classes requiring empty Dispose methods. This has led to problems with static analysis tools that cannot separate real cases of missing Dispose calls from false positives.
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C++ is Coming to .NET Core for Windows
Microsoft has announced plans to offer C++/CLI in .NET Core 3.1. This would only be offered for Windows applications; you won’t be able to use C++/CLI for Linux or OSX.
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F# 4.7 Enables Preview of New Language Features and Relaxes Syntax
The latest release of F# introduces a new LangVersion configuration option which makes it possible to choose which language version you would like the F# compiler to target. Additionally, it introduces a number of syntax relaxations that are aimed to remove a few idiosyncrasies of the language.
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Microsoft Releases C# 8.0
Last week Microsoft announced the official availability of C# 8.0 as part of the .NET Core 3.0 release, simultaneously at .NET Conf 2019 and on their development blog. The new language features include nullable reference types, asynchronous streams, default interface members, and new code patterns. All new features are supported in Visual Studio 2019.