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Type inference

As explained in .NET in Action, Second Edition

Type inference is the compiler's deduction of a program expression or variable's type from available context and assignments.

Type inference is the compiler’s deduction of an expression or variable’s type from available context and assignments. In the ASP.NET Core examples, handler parameters are written explicitly, so the listings provide context for typed parameters rather than a worked inference algorithm. section 3.1

Typed minimal-API handler

The ASCII-art endpoint declares its route value as `(string text)` before passing it to `FiggleFonts.Standard.Render(text)`. A later endpoint declares `(string text, string? font)` and forwards both values to `AsciiArt.Write`. These examples show where parameter types appear in service code, but do not demonstrate the compiler deducing them. section 3.1

How .NET in Action, Second Edition covers it

How deep it goes
Defines deduction from context and assignments but stops short of explaining inference rules, runtime behavior, or implementation internals.
Examples
Uses ASCII-art web endpoints whose route and query parameters are declared as `string` and `string?`.
How it connects
Connects compiler deduction with expressions, variables, assignments, and typed minimal-API handlers.

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This explainer was generated by Manning's knowledge graph from the text of .NET in Action, Second Edition. The section links point to the parts of the book it draws on.