How deeply does ASP.NET Core in Action, 3e cover razor expression?

Defines @, @(), and @@ syntax, contrasts expressions with @{} code blocks, and extends into loops and conditionals.

Razor expression

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

A Razor expression is an inline Razor construct that evaluates a C# expression and writes its result to the generated HTML output.

A Razor expression evaluates a C# expression and writes its result into generated HTML. Use @ for a single expression and @(...) when whitespace makes the expression boundary unclear. section 17.3.1

Writing values into HTML

Use <p>Copyright @DateTime.Now.Year</p> for a simple expression, or <p>The sum of 1 and 2 is @(1 + 2)</p> when the C# expression contains spaces. Razor expressions do not require semicolons. To display a literal @, write @@. section 17.3.1

Razor expressions commonly write PageModel or ViewData values to a view. For dynamic sections, combine expressions with C# if, for, or foreach constructs prefixed by @; use @{} instead when code should execute without producing HTML. section 17.3.1 section 17.3.2

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

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Also explained in

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Pro ASP.NET Core 7, Tenth EditionA Razor expression is an embedded expression in a Razor view that Razor evaluates to produce content in the generated response.

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Related concepts

viewused by · A view is a presentation component or template that renders application data into a user-interface element or client response.
view modeluses · A view model is a data structure that supplies a user-interface view with the data required to render a particular output.
attributeuses · An attribute is a named property, value, or piece of information associated with an entity, object, or program element.
HTMLproduces · HTML (HyperText Markup Language) is the standard markup language for structuring content and elements in web documents.
data attributeuses · An HTML data attribute is a custom attribute whose name begins with data- and whose value stores application-specific information on an element.
methoduses · A method is a callable operation associated with an object or type and invoked through that association.

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.