What’s new in ASP.NET Core in .NET 5 RC2

.NET 5 RC2 (13/10/2020) can be used in practice. This RC2 release is very close to the official release.

New in RC2:

• Improved CSS isolation
• Improved debugging in Blazor WebAssembly
• Tools compatible with web browsers

ASP.NET Core in .NET 5 contains a lot of functionality and improvements. The list below summarizes the improvements:

MVC and Razor Pages

• Model binding supports C # 9 record type
• Model bind DateTime as UTC
• DynamicRouteValueTransformer improved
• Apply CompareAttribute with the model attribute of the page
• Constraint parameters and properties from the body and for the present are required by default

Web API

• Support the Open API specification by default
• Improved experience when pressing F5 with Swagger UI

Blazor

• CSS isolation
• JavaScript object and references
• Component virtualization
• New InputFile Component
• New InputRadio and InputRadioGroup components
• CSS clas properties for custom data validation
• IAsyncDisposable supports components
• Support for status flip events (on / off, close / open)
• Add the OffsetX and OffsetY properties with the MouseEventArgs
• Custom routing parameters and catch them all.
• The Blazor WebAssembly application will use the target .NET 5 by default
• Blazor WebAssembly’s run time performance improvements
• Blazor WebAssembly supports the lazy load
• Blazor WebAssembly is available from the server side
• Blazor supports setting focus settings in the interface
• Blazor Server protects the data storage on the web browser side

SignalR

• Filters Hub
• Invoke a parallel hub
• Messagepack supports SignalR Java client

Kestrel

• Sending HTTP / 2 PING frames
• Performance improvements according to HTTP / 2 standards
• Kestrel’s end-point-specific options are configurable
• The endpoints can be reloaded via configuration
• Decode custom headers
• Support async certificate callback

– Authentication & Authorization

• Activate clas Startup
• Custom console log format and JSON console logger
• Nullability annotation is applicable to all ASP.NET Core assemblies
• JSON extension methods for HttpRequest and HttpResponse
• Automatically refresh the browser (Refresh – F5) with the dotnet watch command

Original article: https://devblogs.microsoft.com/aspnet/asp-net-core-updates-in-net-5-release-candidate-2/