What's new in .NET 5 ?

.NET 5.0 is the next major release of .NET Core following 3.1. We named this new release .NET 5.0 instead of .NET Core 4.0 for two reasons:

We skipped version numbers 4.x to avoid confusion with .NET Framework 4.x.
We dropped "Core" from the name to emphasize that this is the main implementation of .NET going forward. .NET 5.0 supports more types of apps and more platforms than .NET Core or .NET Framework.

ASP.NET Core 5.0 is based on .NET 5.0 but retains the name "Core" to avoid confusing it with ASP.NET MVC 5. Likewise, Entity Framework Core 5.0 retains the name "Core" to avoid confusing it with Entity Framework 5 and 6.

C# updates

Developers writing .NET 5 apps will have access to the latest C# version and features. .NET 5 is paired with C# 9, which brings many new features to the language. Here are a few highlights:

Records: reference types with value-based equality semantics and non-destructive mutation supported by a new with expression.

Relational pattern matching: Extends pattern matching capabilities to relational operators for comparative evaluations and expressions, including logical patterns - new keywords and, or, and not.

Top-level statements: As a means for accelerating adoption and learning of C#, the Main method can be omitted and application as simple as the following is valid:

System.Console.Write("Hello world!");

Function pointers: Language constructs that expose the following intermediate language (IL) opcodes: ldftn and calli.

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