Linq

  • consistent model for working with data from various kinds of sources and formats (XML, SQL, ADO.NET, Datasets, .NET collections etc)
  • 3 stages of working with LINQ:
    • obtain data source
    • create the query
    • execute the query
  • data sources implements IEnumerable<> and are called queryable types
  • IQueryable<> interface inherits from IEnumerable<>
  • generally it is better to use LINQ via IQueryable<> which produces deferred query instead of producing result immediately
  • queries can be executed multiple times
  • queries can be forced immediate execution via Count(), Max(), ToList() or ToArray() etc.
  • LINQ to DB libraries (like EntityFramework) usually are implemented via Expression Trees

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