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Performance implications of default struct equality in C#

July 17, 2018 Jul 17, 2018 07/17/18
Sergey Tepliakov
If you're familiar with C#, then you most likely heard that you should always override and for custom structs for performance reasons. To better understand the importance and the rationale behind this advice we're going to look at the default behavior to see why and where the performance hit comes from. Then we'll look at a performance bug ...

Dissecting new generic constraints in C# 7.3

June 12, 2018 Jun 12, 2018 06/12/18
Sergey Tepliakov
During the last Build conference, Microsoft has announced the next version of Visual Studio with C# 7.3 support. This is yet another minor language update with some quite interesting features. The main change was related to generics, starting from C# 7.3 there 3 more constraints: , and . The constraint The constraint on generic type ...

Performance traps of ref locals and ref returns in C#

April 11, 2018 Apr 11, 2018 04/11/18
Sergey Tepliakov
The C# language from the very first version supported passing arguments by value or by reference. But before C# 7 the C# compiler supported only one way of returning a value from a method (or a property) - returning by value. This has been changed in C# 7 with two new features: ref returns and ref locals. But unlike other features that were...

The ‘in’-modifier and the readonly structs in C#

March 7, 2018 Mar 7, 2018 03/7/18
Sergey Tepliakov
C# 7.2 got two very important features for high-performance scenarios -- the readonly structs and the parameters. But to understand why this additions are so important and how they're related to each other we should look back in history. As you probably know, the .NET ecosystem has two family of types -- the value types (a.k.a. structs) ...

Dissecting the async methods in C#

November 30, 2017 Nov 30, 2017 11/30/17
Sergey Tepliakov
The async series The C# language is great for developer's productivity and I'm glad for the recent push towards making it more suitable for high-performance applications. Here is an example: C# 5 introduced 'async' methods. The feature is very useful from a user's point of view because it helps combining several task-...

Dissecting the tuples in C# 7

November 1, 2017 Nov 1, 2017 11/1/17
Sergey Tepliakov
types were introduced in .NET 4.0 with two significant drawbacks: (1) tuple types are classes and (2) there was no language support for constructing/deconstructing them. To solve these issues, C# 7 introduces new language feature as well as a new family of types (*). Today, if you need to glue together two values to return them from a ...