.NET 10 New Features for Web Developers Print

Overview

.NET 10 is a Long-Term Support (LTS) release with 3 years of support. This article highlights key features relevant to web application development.

ASP.NET Core 10 Highlights

Blazor Improvements

• Static Asset Handling: Blazor scripts now served as static web assets with built-in compression and fingerprinting
• Passkey Authentication: WebAuthn/FIDO2 support for passwordless login
• [PersistentState] Attribute: Declarative state persistence during prerendering
• Improved Performance: Better caching and reduced bundle sizes

Minimal APIs Enhancements

• Built-in Validation: Native DataAnnotations validation support
• Server-Sent Events: TypedResults.ServerSentEvents for streaming
• Better Error Handling: Improved IProblemDetailsService integration
• Record Type Support: Better handling of record types

OpenAPI 3.1 Support

• Full OpenAPI 3.1 compatibility
• YAML output support
• Improved schema generation
• XML documentation processing

C# 14 New Features

Field-Backed Properties

public class Person
{
    // Use field keyword in property accessors
    public string Name
    {
        get => field;
        set => field = value?.Trim() ?? "";
    }
}

Null-Conditional Assignment

// New in C# 14
person?.Name ??= "Default";

Collection Expression Extensions

Enhanced collection initialization with spread operator and more.

Performance Improvements

• JIT Enhancements: Better inlining, devirtualization, and stack allocations
• Struct Handling: Members go directly into registers
• Loop Optimization: Graph-based loop inversion
• Array Interface: De-virtualization enables inlining

Security Updates

• Post-Quantum Cryptography: Future-proof encryption support
• TLS 1.3: Enhanced TLS handling
• Passkeys: FIDO2/WebAuthn authentication

Entity Framework Core 10

• LeftJoin/RightJoin: Native LINQ support
• Vector Search: AI-ready semantic search
• Native JSON Types: Azure SQL and SQL Server support
• Named Query Filters: Multiple filters per entity

Migration from Earlier Versions

1. Update target framework to net10.0 in your .csproj
2. Update NuGet packages to .NET 10 versions
3. Review breaking changes in Microsoft documentation
4. Test thoroughly before deployment

Project File Update

<TargetFramework>net10.0</TargetFramework>

Resources

• Microsoft .NET 10 Documentation
• ASP.NET Core 10 Release Notes