Select
Select is a LINQ sequence operator that transforms each source element into a corresponding projected result.
.NET in Action, Second Edition
Select is a LINQ extension method that projects each element of an enumerable sequence into a new form.
- How it is used
- Projects reflected font properties into names or name-and-font tuples for a web service’s font listing.
- How deep it goes
- Shows query syntax, its Select method equivalent, and two output shapes; stops short of implementing the extension method.
- Examples
- Uses PropertyInfo-to-name and PropertyInfo-to-tuple projections while building an ASCII-art font endpoint.
- What you can do after
- Apply it via LINQ to select the output fields a sequence or service response needs.
ASP.NET Core in Action, 3e
A select clause is a LINQ query operation that projects source elements into a specified result shape.
- How it is used
- Projects EF Core entities into API-facing view models while limiting database columns to those required by the result.
- How deep it goes
- Explains projection, SQL execution, nested mapping, and client-side fallback for expressions EF Core cannot translate.
- Examples
- Uses recipe lists, summary view models, detail view models, formatted cooking times, and nested ingredients as projection examples.
- What you can do after
- Apply it via EF Core to return filtered lists or individual records as efficiently shaped view models.
Related concepts
- mapequivalent to · An operation that applies a function to values in a collection or computational context, producing corresponding results while preserving the collection or context’s structure.
- IEnumerableuses · IEnumerable is a .NET interface representing a sequence whose elements can be traversed through an enumerator.
- LINQpart of · LINQ is a .NET language-integrated query technology for querying and transforming data from collections and other data sources.
- Entity Framework Coreuses · Entity Framework Core is a cross-platform object-relational mapping framework for .NET that enables applications to query and persist data through .NET objects and APIs.
- selectequivalent to · SELECT is a SQL query construct that specifies the rows, columns, or expressions retrieved from one or more queryable data sources.
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