Update: Starting in Visual Studio 2015 Update 1, there is a simple process in the GUI to do the steps below for you. Simply right-click your web project and select “Enable C# 6 / VB 14”. More information is available on the MSDN blog post, “New feature to enable C# 6 / VB 14”. Since … Read more
A new feature in C# 6.0 allows to declare variable inside TryParse method. Declaration expressions was cut from C# 6.0 and wasn’t shipped in the final release. You currently can’t do that. There is a proposal for it on GitHub for C# 7 (also see this for future reference). Update (07/03/2017) With the official release … Read more
This is a new C# 6 feature, “Getter-only auto-properties”, also known as “Auto-Property Initializers for Read-Only Properties” as discussed in this MSDN magazine article ‘C# : The New and Improved C# 6.0’ by Mark Michaelis and in the C# 6.0 draft Language Specification. The read-only field’s setter is only accessible in the constructor, in all … Read more
You can specify a format string after an expression with a colon (:): var aNumberAsString = $”{aDoubleValue:0.####}”;
Make sure you call: C:\Program Files (x86)\MSBuild\14.0\Bin\MsBuild.exe That’s the version of MsBuild that ships with Visual Studio 2015 and calls the C# compiler that understands this. You can get this version of MsBuild on your system by installing any edition of Visual Studio 2015 or by installing the stand-alone Microsoft Build Tools 2015. Adding a … Read more
First of all, that is not lambda, although syntax is similar. It is called “expression-bodied members”. They are similar to lambdas, but still fundamentally different. Obviously they can’t capture local variables like lambdas do. Also, unlike lambdas, they are accessible via their name:) You will probably understand this better if you try to pass an … Read more
It’s complicated since expression tree lambdas (unlike delegate lambdas) are interpreted by already existing LINQ providers which don’t yet support null propagating. Converting to a conditional expression is not always accurate as there are multiple evaluations while with ?. there’s only a single evaluation for example: customer.Where(a => c.Increment()?.Name) // Written by the user customer.Where(a … Read more
Yes. nameof() is evaluated at compile-time. Looking at the latest version of the specs: The nameof expression is a constant. In all cases, nameof(…) is evaluated at compile-time to produce a string. Its argument is not evaluated at runtime, and is considered unreachable code (however it does not emit an “unreachable code” warning). From nameof … Read more
Here are all access modifiers in Venn diagrams, from more limiting to more promiscuous: private: private protected: – added in C# 7.2 internal: protected: protected internal: public:
You can set the language feature for each project separately by going to Properties => Build tab => Advanced button => Language Version and set your preferred version. You should realize that it will still use the new “C# 6.0” .Net Compiler Platform (codenamed Roslyn). However, that compiler will imitate the behavior of older compilers … Read more