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Path.Combine

As explained in ASP.NET Core in Action, 3e

Path.Combine is a .NET API method that joins path components using the directory separator appropriate for the current platform.

Path.Combine joins path components with the directory separator required by the current platform. It prevents Windows-specific paths from breaking when an application runs on Linux. section 27.3.2

Build a portable file path

Use Path.Combine("subdir", "myfile.json") instead of writing "subdir\\myfile.json" directly. The resulting path uses the appropriate separator for the operating system. section 27.3.2

How ASP.NET Core in Action, 3e covers it

How deep it goes
Defines the API and demonstrates one path-building example, without detailing its implementation or edge cases.
Examples
Uses Path.Combine("subdir", "myfile.json") as a portable alternative to a Windows-style path string.
What you can do after
Apply it via the .NET API to construct file paths that work across operating systems.
How it connects
Connects Path.Combine with file paths, directory separators, Linux deployment, and hardcoded paths.
Cover of ASP.NET Core in Action, 3e
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Related concepts

This explainer was generated by Manning's knowledge graph from the text of ASP.NET Core in Action, 3e. The section links point to the parts of the book it draws on.