After many years of workarounds, design discussions and library-level substitutes, unions are finally becoming a first-class part of C#. The proposal in the C# language repository is no longer a distant idea. With the feature now appearing in the .NET 11 preview train as an early C# 15 capability, the direction is concrete enough to discuss in practical terms.
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C# is a powerful language, but there is one road it has not yet fully paved: native discriminated union types. Developers have been working around this absence for years, typically choosing between throwing exceptions for non-exceptional paths, returning nullable values, using out parameters or layering custom wrapper classes on top of every service boundary. Each of these approaches carries a cost - in clarity, type safety or runtime efficiency.
The .NET team just released the first preview of .NET 11 and there is already a lot to talk about. While this is an early preview - not a release candidate - the breadth of changes touching the runtime, libraries, ASP.NET Core, Blazor, C#, the SDK and Entity Framework Core gives a clear picture of where the platform is heading. Let me walk you through the most important changes you should know about.
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Local SQL Server database files provide a pragmatic way to keep a real SQL Server engine close to the application without provisioning a full server. A LocalDB database lives in a single .mdf file (plus a log file), runs in user mode and behaves like SQL Server for most application scenarios. That makes it a strong fit for local development, integration tests and tooling that needs relational features without the overhead of infrastructure setup.
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The landscape of AI development is shifting rapidly from simple chat interfaces to fully integrated, agentic workflows like the Ralph Loop . GitHub has recently introduced the GitHub Copilot SDK , a powerful toolkit that allows developers to programmatically harness the engine behind the GitHub Copilot CLI.
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Feature management is a key technique in modern web applications, allowing you to enable or disable features dynamically without redeploying your code. In ASP.NET Core, the Microsoft.FeatureManagement library provides a robust way to implement feature flags. But what if you want to ensure that administrators can always access certain features, even if those features are disabled for regular users?
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Noch fünf Monate, dann erscheint C# 9 - doch was gibt es eigentlich alles Neues? Und für wen sind all die Neuerungen gedacht?
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