.NET 10 미리보기 5가 릴리스 되었습니다.

dimohy · 6월 10, 2025, 10:28오후

어느덧 .NET 미리보기 5가 릴리스 되었습니다.

릴리스 노트

release-notes/10.0/preview/preview5/README.md

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# .NET 10 Preview 5 - Release Notes

.NET 10 Preview 5 released on June 10, 2025. Find more information on new features released in .NET 10 Preview 5 by browsing through the release notes below:

- [Libraries](./libraries.md)
- [Runtime](./runtime.md)
- [SDK](./sdk.md)

## Languages

- [C#](./csharp.md)
- [F#](./fsharp.md)
- [Visual Basic](./visualbasic.md)

## Workloads, Libraries, & More

- [.NET MAUI](./dotnetmaui.md)
- [ASP.NET Core](./aspnetcore.md)
- [Container images](./containers.md)
- [EF Core & Data](./efcore.md)

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.NET 라이브러리

github.com/dotnet/core

release-notes/10.0/preview/preview5/libraries.md

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# .NET Libraries in .NET 10 Preview 5 - Release Notes

Here's a summary of what's new in .NET Libraries in this preview release:

- [Post-Quantum Cryptography (PQC)](#post-quantum-cryptography-pqc)

.NET Libraries updates in .NET 10:

- [What's new in .NET 10](https://learn.microsoft.com/dotnet/core/whats-new/dotnet-10/overview) documentation

## Post-Quantum Cryptography (PQC)

.NET 10 Preview 5 includes support for three new asymmetric algorithms: ML-KEM (FIPS 203), ML-DSA (FIPS 204), and SLH-DSA (FIPS 205).
These new algorithms made us call into question some of the assumptions underlying the `AsymmetricAlgorithm` type,
and we found that there's not much benefit (but some non-trivial drawbacks) to have these algorithm classes continue to derive from it.

Rather than the AsymmetricAlgorithm approach of creating an object then importing a key into it, or generating a fresh key,
these new types all use static methods to clearly generate a fresh key or import a key:

```C#

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.NET 런타임

github.com/dotnet/core

release-notes/10.0/preview/preview5/runtime.md

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# .NET Runtime in .NET 10 Preview 5 - Release Notes

Here's a summary of what's new in the .NET Runtime in this preview release:

- [Escape Analysis for Delegate](#escape-analysis-for-delegates)
- [Inlining Improvements](#inlining-improvements)
- [ARM64 Write Barrier Improvements](#arm64-write-barrier-improvements)

.NET Runtime updates in .NET 10:

- [What's new in .NET 10](https://learn.microsoft.com/dotnet/core/whats-new/dotnet-10/overview) documentation

## Escape Analysis for Delegates

Preview 5 extends the JIT compiler's escape analysis implementation to model delegate invokes. When compiling source code to IL, each delegate is transformed into a closure class with a method corresponding to the delegate's definition, and fields matching any captured variables. At runtime, a closure object is created to instantiate the captured variables, along with a `Func` object to invoke the delegate. Thanks to [dotnet/runtime #115172](https://github.com/dotnet/runtime/pull/115172), if escape analysis determines the `Func` object will not outlive its current scope, the JIT will allocate it on the stack.

Consider the following example:

```csharp
 public static int Main()

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.NET SDK

C#

github.com/dotnet/core

release-notes/10.0/preview/preview5/csharp.md

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# C# 14 updates in .NET 10 Preview 5 - Release Notes

Here's a summary of what's new in C# in this preview release:

- [User defined compound assignment operators](#user-defined-compound-assignment-operators)

C# 14 updates:

- [What's new in C# 14](https://learn.microsoft.com/dotnet/csharp/whats-new/csharp-14) documentation
- [Breaking changes in C# 14](https://learn.microsoft.com/dotnet/csharp/whats-new/breaking-changes/compiler%20breaking%20changes%20-%20dotnet%2010)

## User defined compound assignment operators

This feature enables type authors to implement compound assignment operators in a manner that modifies the target in place rather than create copies.

For example, the `+=` operator was defined to perform the addition and then an assignment. In other words, the code:

```csharp
a += b;
```

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github.com/dotnet/core

release-notes/10.0/preview/preview5/csharp.md

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# C# 14 updates in .NET 10 Preview 5 - Release Notes

Here's a summary of what's new in C# in this preview release:

- [User defined compound assignment operators](#user-defined-compound-assignment-operators)

C# 14 updates:

- [What's new in C# 14](https://learn.microsoft.com/dotnet/csharp/whats-new/csharp-14) documentation
- [Breaking changes in C# 14](https://learn.microsoft.com/dotnet/csharp/whats-new/breaking-changes/compiler%20breaking%20changes%20-%20dotnet%2010)

## User defined compound assignment operators

This feature enables type authors to implement compound assignment operators in a manner that modifies the target in place rather than create copies.

For example, the `+=` operator was defined to perform the addition and then an assignment. In other words, the code:

```csharp
a += b;
```

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ASP.NET Core

github.com/dotnet/core

release-notes/10.0/preview/preview5/aspnetcore.md

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# ASP.NET Core in .NET 10 Preview 5 - Release Notes

Here's a summary of what's new in ASP.NET Core in this preview release:

- [Configure custom security descriptors for HTTP.sys request queues](#configure-custom-security-descriptors-for-httpsys-request-queues)
- [Validation resolver APIs marked as experimental](#validation-resolver-apis-marked-as-experimental)
- [Support for generating OpenAPI 3.1](#support-for-generating-openapi-31)
- [OpenAPI metadata from XML doc comments](#openapi-metadata-from-xml-doc-comments)
- [Add a Not Found page using the Blazor Router](#add-a-not-found-page-using-the-blazor-router)
- [Blazor metrics and tracing](#blazor-metrics-and-tracing)

ASP.NET Core updates in .NET 10:

- [What's new in ASP.NET Core in .NET 10](https://learn.microsoft.com/aspnet/core/release-notes/aspnetcore-10.0) documentation.
- [Breaking changes](https://docs.microsoft.com/dotnet/core/compatibility/10.0#aspnet-core)
- [Roadmap](https://github.com/dotnet/aspnetcore/issues/59443)

## Configure custom security descriptors for HTTP.sys request queues

You can now specify a custom security descriptor for HTTP.sys request queues using the new `RequestQueueSecurityDescriptor` property on `HttpSysOptions`. This feature enables more granular control over access rights for the request queue, allowing you to tailor security to your application's needs.

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.NET MAUI

github.com/dotnet/core

release-notes/10.0/preview/preview5/dotnetmaui.md

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# .NET MAUI in .NET 10 Preview 5 - Release Notes

Here's a summary of what's new in .NET MAUI, .NET for Android, and .NET for iOS, Mac Catalyst, macOS, and tvOS in this preview release:

- .NET MAUI
  - [XAML Global Namespaces](#xaml-global-namespaces)
  - [XAML Implicit Namespaces](#xaml-global-namespaces)
  - [Intercept web requests](#intercept-web-requests)
- [.NET for Android](#net-for-android)
- [.NET for iOS, Mac Catalyst, macOS, tvOS](#net-for-ios-mac-catalyst-macos-tvos)

.NET MAUI updates in .NET 10:

- [What's new in .NET MAUI in .NET 10](https://learn.microsoft.com/dotnet/maui/whats-new/dotnet-10) documentation.

## XAML Global Namespaces

In your projects you can now glob together XML-namespaces into a new global namespace `xmlns="http://schemas.microsoft.com/dotnet/maui/global"`, and use them without prefixes. The .NET MAUI namespace is included already.

By convention the new project template creates a file `GlobalXmlns.cs`.

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EF Core

github.com/dotnet/core

release-notes/10.0/preview/preview5/efcore.md

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# Entity Framework Core 10 Preview 5 - Release Notes

Here's a summary of what's new in Entity Framework Core in this preview release:

- [Custom Default Constraint Names](#customdefaultconstraintnames)

Entity Framework Core 10 updates:

- [What's new in Entity Framework Core 10](https://learn.microsoft.com/ef/core/what-is-new/ef-core-10.0/whatsnew) documentation
- [Breaking change in Entity Framework Core 10](https://learn.microsoft.com/ef/core/what-is-new/ef-core-10.0/breaking-changes)

## Custom Default Constraint Names

In previous versions of EF Core, when you specified a default value for a property, EF Core would always let the database automatically generate a constraint name. Now, you can explicitly specify the name for default value constraints for SQL Server, giving you more control over your database schema.

You can now specify a constraint name when defining default values in your model configuration:

```C#
protected override void OnModelCreating(ModelBuilder modelBuilder)
{

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Windows Forms / WPF

Windows Forms

github.com/dotnet/core

release-notes/10.0/preview/preview5/winforms.md

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# Windows Forms in .NET 10 Preview 5 - Release Notes

Here's a summary of what's new in Windows Forms in this preview release:

- [Bug Fixes](#bug-fixes)
- [Engineering Health](#engineering-health)

## Windows Forms updates in .NET 10

- [What's new in Windows Forms in .NET 10](https://learn.microsoft.com/dotnet/desktop/winforms/whats-new/net100) documentation.
- [Issues List for Windows Forms in .NET 10 Preview 5](https://github.com/dotnet/winforms/issues?q=is%3Aissue%20milestone%3A%2210%20Preview5%22%20)

## Bug Fixes

Addressed various bug fixes including:

- Fixing a regression regarding `PrinterSettings.DefaultPageSettings.Color` returning an incorrect value.
- Removing false positives being returned by the WFO1000 Analyzer when analyzing properties of interfaces derived from IComponent.
- Resolving a memory leak in the MSHTML component.
- Addressing an `InvalidOperationException` in the constructor of `ListViewGroupAccessibleObject`

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WPF

github.com/dotnet/core

release-notes/10.0/preview/preview5/wpf.md

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# WPF in .NET 10 Preview 5 - Release Notes

Here's a summary of what's new in WPF in this preview release:

- [XAML Grid Syntax Enhancements](#xaml-grid-syntax-enhancements)
- [Font and Globalization Updates](#font-and-globalization-updates)
- [Fluent Theme Improvements](#fluent-theme-improvements)
- [Performance and Code Quality Improvements](#performance-and-code-quality-improvements)

WPF updates in .NET 10:

- [What's new in WPF in .NET 10](https://learn.microsoft.com/dotnet/desktop/wpf/whats-new/net100) documentation.

## XAML Grid Syntax Enhancements

This release introduces a new shorthand syntax for defining `Grid.RowDefinitions` and `Grid.ColumnDefinitions` in XAML, with full support for XAML Hot Reload.

**Example:**

```xml

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dimohy · 6월 10, 2025, 10:37오후

주요 업데이트

Runtime

델리게이트를 위한 이스케이프 분석
인라이닝 개선
ARM64 쓰기 배리어 개선

Libraries

Post-Quantum Cryptography (PQC) - 양자 내성 암호화

새로운 비대칭 알고리즘 3종 추가
- ML-KEM (FIPS 203): Module-Lattice-based Key-Encapsulation Mechanism
- ML-DSA (FIPS 204): Module-Lattice-based Digital Signature Algorithm
- SLH-DSA (FIPS 205): Stateless Hash-Based Digital Signature Algorithm
새로운 API 설계 접근 방식
- AsymmetricAlgorithm 상속 대신 독립적인 타입으로 구현
- 정적 메서드를 통한 명확한 키 생성 및 가져오기

// 키 가져오기 예시
using (MLDsa key = MLDsa.ImportFromPem(publicKeyPem))
{
   return key.VerifyData(data, signature);
}

// 키 생성 예시
using (MLKem key = MLKem.GenerateKey(MLKemAlgorithm.MLKem768))
{
   string publicKeyPem = key.ExportSubjectPublicKeyInfoPem();
}

플랫폼 지원
- 현재 OpenSSL 3.5 이상에서만 지원
- Windows CNG 지원 예정
- IsSupported 정적 속성으로 지원 여부 확인 가능
실험적 기능 표시
- [Experimental] 특성으로 표시 (진단 코드: SYSLIB5006)
- 완전한 개발이 완료될 때까지 실험적 상태 유지

언어

C# 14

사용자 정의 복합 할당 연산자 (User defined compound assignment operators)
- +=, -=, *=, /=, %=, &=, |=, ^=, <<=, >>=, >>>= 연산자를 사용자가 직접 구현 가능
- 기존 방식: a += b는 a = a + b로 변환되어 새 인스턴스 생성
- 개선된 방식: 대상을 직접 수정하여 메모리 효율성 향상
- Tensor나 대규모 데이터 구조에서 메모리 사용량과 가비지 컬렉션 부담 감소
- checked와 unchecked 변형도 지원 (+=, -=, *=, /=)

F#

Scoped Nowarn/Warnon 지원
- #nowarn/#warnon 지시문을 특정 범위에만 적용 가능
익명 레코드와 측정 단위 파싱 오류 수정
let!과 use! 타입 주석 개선

프레임워크별 업데이트

ASP.NET Core

HTTP.sys 요청 큐를 위한 사용자 정의 보안 디스크립터 구성
OpenAPI 3.1 생성 지원
XML 문서 주석에서 OpenAPI 메타데이터 추출
Blazor Router에 Not Found 페이지 추가
- NotFoundPage 파라미터 지원
Blazor 메트릭 및 추적 기능
- 컴포넌트 생명주기 추적
- 네비게이션 이벤트 추적
- 이벤트 처리 추적
- 회로 관리 메트릭

.NET MAUI

XAML Global Namespaces
- 전역 네임스페이스로 XML 네임스페이스 통합
XAML Implicit Namespaces
- xmlns 선언 없이 XAML 사용 가능
웹 요청 가로채기
- WebView에서 웹 요청 인터셉트 기능

Entity Framework Core

사용자 정의 기본 제약 조건 이름 설정 기능

WPF

XAML Grid 구문 개선
폰트 및 글로벌라이제이션 업데이트
Fluent 테마 개선
성능 및 코드 품질 향상

Windows Forms

버그 수정
엔지니어링 품질 개선

BigSquare · 6월 11, 2025, 1:37오전

제목만 보고 .Net 5 인 줄 알았습니다.

이광석 · 6월 11, 2025, 1:39오전

WPF Grid… 이제서야…

dimohy · 6월 11, 2025, 1:47오전

중요한 2바이트 정보가 누락되어 있었군요… 심지어 앞전 게시글도 T_T 늙었나봅니다.

rkttu · 6월 11, 2025, 2:50오전

Microsoft 공식 블로그로도 포스팅되어있으니 같이 보시고 공유하기 편하실 겁니다.

leechw9 · 6월 12, 2025, 12:17오전

<Grid RowDefinitions="Auto,*,Auto" ColumnDefinitions="*, Auto">
    <TextBlock Text="Row 0, Col 0" Grid.Row="0" Grid.Column="0" />
    <TextBlock Text="Row 1, Col 1" Grid.Row="1" Grid.Column="1" />
    <TextBlock Text="Row 2, Col 0" Grid.Row="2" Grid.Column="0" />
</Grid>

참고 : core/release-notes/10.0/preview/preview5/wpf.md at main · dotnet/core · GitHub