What’s New in .NET Core 3.0: Complete Overview

.NET Core 3.0 is finally here, and it’s the biggest release yet. Desktop support, C# 8.0, performance improvements—let’s break it down.

Major Features

• Windows Desktop: WPF and WinForms now run on .NET Core
• C# 8.0: Nullable reference types, async streams, pattern matching
• gRPC: First-class support for high-performance RPC
• Blazor Server: C# in the browser (server-side)
• Single-file executables: Deploy as one file

Performance

Tiered compilation is now default. JSON serialization is 2x faster with the new System.Text.Json. HTTP/2 is enabled by default.

Breaking Changes

• ASP.NET Core 3.0 no longer supports .NET Framework
• Entity Framework Core 3.0 has breaking query changes
• Endpoint routing is now the default

Upgrade Path

<TargetFramework>netcoreapp3.0</TargetFramework>

References

• Announcing .NET Core 3.0