What’s New in .Net 5?

  • Date Published
  • Categories Blog, News, Tutorial
  • Reading Time 5-Minute Read

NET 5 is the evolution of .NET Core. This article details what’s included in .NET 5, which is the next release of .NET Core following 3.1.

The version number is 5.0 to avoid confusion with .NET Framework 4.x. And “Core” is dropped from the name because it is the main implementation of .NET going forward. ASP.NET Core retains the name “Core” to avoid confusing it with ASP.NET MVC 5. Additionally, Entity Framework Core retains the name “Core” to avoid confusing it with Entity Framework 5 and 6. .NET 5 supports more types of apps and more platforms than .NET Core or .NET Framework.

The advent of .NET Core has evolved the .NET ecosystem in compelling ways. It matured as an open-source project on GitHub, celebrating community contributions, and humbly improving over time.

.NET Core has several primary characteristics:

  • Cross-platform
  • Open-source
  • Side-by-side installation
  • Small project files (SDK-style)
  • Flexible deployment

.NET 5 extends these characteristics, making incremental improvements:

What .NET 5 is not

.NET 5 is not a complete replacement for .NET Framework. There are no plans to port the following technologies from .NET Framework to .NET 5, but there are supported alternatives:


  1. Web Forms
  2. Windows Communication Foundation (WCF
  3. Windows Workflow (WF)

Recommended alternative

  1. ASP.NET Core Blazor or Razor Pages
  2. gRPC
  3. Windows Workflow (WF)Open-source CoreWF

.NET Standard

New application development can specify the net5.0 target framework moniker (TFM) for all project types, including class libraries. Sharing code between .NET 5 workloads is simplified in that all you need is the net5.0 TFM.

The net5.0 TFM combines and replaces the netcoreapp and netstandard names. This TFM will generally only include technologies that work cross-platform, like was done with .NET Standard. However, if you plan to share code between .NET Framework, .NET Core, and .NET 5 workloads, you can do so by specifying netstandard2.0 as your TFM. For more information, see How to specify target frameworks.

Language updates

With .NET 5, the .NET programming languages are continuing to improve.

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:


Immutable reference types that behave like value types, and introduce the new with keyword into the language.

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.

For more information on the available C# 9 features, see What’s new in C# 9.

Source generators

In addition to some of the highlighted new C# features, source generators are making their way into developer projects. Source generators allow code that runs during compilation to inspect your program and produce additional files that are compiled together with the rest of your code.

For more information on source generators, see Introducing C# source generators and C# source generator samples.

F# updates

F# is the .NET functional programming language, and with .NET 5, developers have access to F# 5. Here are several new features of F# 5:

Interpolated strings

Similar to interpolated string in C#, and even JavaScript, F# supports basic string interpolation.


let name = “David”
let age = 36
let message = $”{name} is {age} years old.”

In addition to basic string interpolation, there is typed interpolation. With typed interpolation, a given type must match the format specifier.


let name = “David”
let age = 36
let message = $”%s{name} is %d{age} years old.”

This is similar to the sprintf function that formats a string based on type-safe inputs.

Visual Basic updates

There are no new language features for Visual Basic in .NET 5. However, with .NET 5, Visual Basic support is extended to:

For more information on project templates from the .NET CLI, see dotnet new.


.NET MAUI is an evolution of the increasingly popular Xamarin.Forms toolkit, and is open-source on GitHub at dotnet/maui. With .NET MAUI, the choice for .NET developers is simplified, providing a single stack that supports all modern workloads: Android, iOS, macOS, and Windows. With .NET MAUI, you get a single project developer experience that targets multiple platforms and devices.


.NET MAUI is in early preview. Sample source code can be found at xamarin/net6-samples.

Model-View-Update pattern

Developers love modern development patterns. A fluent approach to UI development, inspired by “The Elm Architecture” is the model-view-update or MVU pattern. MVU promotes a one-way flow of data and state management, as well as a code-first development experience that rapidly updates the UI by applying only the changes necessary.

As an example, consider the following counter written in .NET MAUI using the MVU pattern:


readonly State<int> _count = 0;

View body() => new StackLayout
new Label(“Welcome to .NET MAUI!”),
new Button(
() => $”You clicked {_count} times.”,
() => ++ _count.Value)