Home Library Learn Downloads Support Community
Sign in | United States - English | |
7 out of 12 rated this helpful - Rate this topic

System.Linq Namespace

.NET Framework 4

The System.Linq namespace provides classes and interfaces that support queries that use Language-Integrated Query (LINQ).

The System.Linq namespace is in the System.Core assembly (in System.Core.dll).

The Enumerable class contains LINQ standard query operators that operate on objects that implement IEnumerable<T>.

The Queryable class contains LINQ standard query operators that operate on objects that implement IQueryable<T>.

For information about LINQ to SQL, see LINQ to SQL.

  Class Description
Public class Enumerable Provides a set of static (Shared in Visual Basic) methods for querying objects that implement IEnumerable<T>.
Public class EnumerableExecutor Represents an expression tree and provides functionality to execute the expression tree after rewriting it.
Public class EnumerableExecutor<T> Infrastructure. Represents an expression tree and provides functionality to execute the expression tree after rewriting it.
Public class EnumerableQuery Infrastructure. Represents an IEnumerable as an EnumerableQuery data source.
Public class EnumerableQuery<T> Infrastructure. Represents an IEnumerable<T> collection as an IQueryable<T> data source.
Public class Lookup<TKey, TElement> Represents a collection of keys each mapped to one or more values.
Public class OrderedParallelQuery<TSource> Represents a sorted, parallel sequence.
Public class ParallelEnumerable Provides a set of methods for querying objects that implement ParallelQuery{TSource}. This is the parallel equivalent of Enumerable.
Public class ParallelQuery Represents a parallel sequence.
Public class ParallelQuery<TSource> Represents a parallel sequence.
Public class Queryable Provides a set of static (Shared in Visual Basic) methods for querying data structures that implement IQueryable<T>.
  Interface Description
Public interface IGrouping<TKey, TElement> Represents a collection of objects that have a common key.
Public interface ILookup<TKey, TElement> Defines an indexer, size property, and Boolean search method for data structures that map keys to IEnumerable<T> sequences of values.
Public interface IOrderedEnumerable<TElement> Represents a sorted sequence.
Public interface IOrderedQueryable Represents the result of a sorting operation.
Public interface IOrderedQueryable<T> Represents the result of a sorting operation.
Public interface IQueryable Provides functionality to evaluate queries against a specific data source wherein the type of the data is not specified.
Public interface IQueryable<T> Provides functionality to evaluate queries against a specific data source wherein the type of the data is known.
Public interface IQueryProvider Defines methods to create and execute queries that are described by an IQueryable object.
  Enumeration Description
Public enumeration ParallelExecutionMode The query execution mode is a hint that specifies how the system should handle performance trade-offs when parallelizing queries.
Public enumeration ParallelMergeOptions Specifies the preferred type of output merge to use in a query. In other words, it indicates how PLINQ should merge the results from the various partitions back into a single result sequence. This is a hint only, and may not be respected by the system when parallelizing all queries.
Did you find this helpful?
(1500 characters remaining)
Community Content Add
Annotations FAQ