Announcing ASP.NET Core in .NET 11

[wtgodbe]

Announcing ASP.NET Core in .NET 11

We are pleased to announce the general availability of .NET 11! 🎉

ASP.NET Core in .NET 11 includes:

• Async validation for Minimal APIs and Blazor forms.
• Blazor static SSR improvements, including client-side validation, temporary and session data, and CacheView.
• Blazor Server circuit pause, including opt-in automatic pausing of inactive tabs.
• Blazor virtualization improvements, including scroll-to-item support in Virtualize and QuickGrid.
• SignalR authentication refresh without reconnecting, including updated authentication state in Blazor Server apps.
• OpenAPI 3.2 by default, including support for describing server-sent events.
• C# 15 union types in JSON request and response bodies, with OpenAPI schema generation.
• An MCP server template in the .NET SDK.
• Experimental Blazor AI components for agentic user interfaces, including tool rendering, approval flows, and shared state.

For more details, see What's new in ASP.NET Core in .NET 11.

Download and install .NET 11 at get.dot.net or browse all .NET 11 downloads.