Install .NET 9 Preview 6 In Linux

Microsoft's .NET 9 Preview 6 release significantly enhances the .NET ecosystem, building upon the .NET 8 foundation with improvements for cloud-native applications, performance, and developer experience. This guide details .NET 9's key features and its Linux installation.

.NET 9 Highlights

This release boasts numerous advancements:

Runtime Enhancements:

• A refined attribute model for feature switches, now with trimming support.
• Substantial performance boosts through loop optimizations, improved inlining, enhanced PGO (Profile-Guided Optimization), Arm64 vectorization and code generation, faster exception handling, and AVX-512 support.

Library Improvements:

• System.Text.Json: Expanded customization options and web defaults.
• LINQ: Addition of CountBy and AggregateBy methods.
• Collections: An upgraded PriorityQueue<t></t> implementation.
• Cryptography: A new one-shot hash method and KMAC algorithm support.
• Reflection: Introduction of PersistedAssemblyBuilder for saving emitted assemblies.
• TimeSpan: More precise From* methods for TimeSpan object creation.

SDK Enhancements:

• Streamlined unit testing integration with MSBuild.
• New options for dotnet tool install.
• A default-enabled terminal logger with improved usability.
• New MSBuild script analyzers.

ML.NET and .NET Aspire:

• ML.NET 4.0: Support for advanced tokenizers and AI models.
• .NET Aspire: A preview release for creating cloud-ready, distributed applications.

Web Development (ASP.NET Core):

• Improvements across Blazor, SignalR, Minimal APIs, OpenAPI, and authentication/authorization.

Mobile Development (.NET MAUI):

• Focus on enhancing product quality.

Data Access (Entity Framework Core):

• Major updates to the Azure Cosmos DB provider.
• Progress towards AOT compilation and pre-compiled queries.

Language Features (C# 13):

• params collections.
• New lock type and semantics.
• \e escape sequence.
• Method group natural type improvements.
• Implicit indexer access in object initializers.

Desktop Development (WPF):

• Windows 11 theming support.
• Hyphen-based ligature support.

Installing the .NET 9.0 SDK on Linux

Step 1: Download .NET 9 Preview 6

Download the .NET 9.0 SDK (v9.0.100-preview.6) from the official download page. Choose the appropriate Linux binary installer.

Step 2: Verify the Download

Verify the downloaded installer's integrity using checksum verification. Obtain the checksum from the download page and compare it to the checksum of your downloaded file using sha512sum:

sha512sum dotnet-sdk-9.0.100-preview.6.24328.19-linux-x64.tar.gz

Step 3: Extract and Install

Extract the SDK and set environment variables (for the current session):

mkdir -p $HOME/dotnet && tar zxf dotnet-sdk-9.0.100-preview.6.24328.19-linux-x64.tar.gz -C $HOME/dotnet
export DOTNET_ROOT=$HOME/dotnet
export PATH=$PATH:$HOME/dotnet

Step 4: Permanent PATH Configuration

For permanent access, add these lines to your shell's profile file (e.g., ~/.bashrc, ~/.zshrc):

export DOTNET_ROOT=$HOME/dotnet
export PATH=$PATH:$HOME/dotnet

Step 5: Verification

Verify the installation:

Check the version:

dotnet --version

List installed SDKs and runtimes:

dotnet --list-sdks
dotnet --list-runtimes

Step 6: .NET CLI Help

Access help:

dotnet --help
dotnet [command] --help

Conclusion

.NET 9 Preview 6 offers exciting advancements for developers. Remember that this is a preview; use it for testing and development, not production. Refer to the official .NET documentation for the latest information. The official announcement link (.NET 9 Preview 6 is now available!) should be included here for completeness.

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