System.Linq
Microsoft.CSharp.RuntimeBinder
Microsoft.Devices
Microsoft.Devices.Radio
Microsoft.Devices.Sensors
Microsoft.Internal
Microsoft.Phone
Microsoft.Phone.Automation.Peers
Microsoft.Phone.BackgroundAudio
Microsoft.Phone.BackgroundTransfer
Microsoft.Phone.Controls
Microsoft.Phone.Controls.Primitives
Microsoft.Phone.Data.Linq
Microsoft.Phone.Data.Linq.Mapping
Microsoft.Phone.DeviceManufacturers
Microsoft.Phone.Globalization
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Microsoft.Phone.Maps
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Microsoft.Phone.Maps.Services
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System
System.CodeDom.Compiler
System.Collections
System.Collections.Generic
System.Collections.ObjectModel
System.Collections.Specialized
System.ComponentModel
System.Configuration.Assemblies
System.Data
System.Data.Common
System.Data.Linq
System.Data.Linq.Mapping
System.Data.Linq.SqlClient
System.Device.Location
System.Diagnostics
System.Diagnostics.CodeAnalysis
System.Diagnostics.Contracts
System.Diagnostics.SymbolStore
System.Dynamic
System.Globalization
System.IO
System.IO.IsolatedStorage
System.Linq
Enumerable Class
EnumerableExecutor Class
EnumerableExecutor(T) Class
EnumerableQuery Class
EnumerableQuery(T) Class
IGrouping(TKey, TElement) Interface
ILookup(TKey, TElement) Interface
IOrderedEnumerable(TElement) Interface
IOrderedQueryable Interface
IOrderedQueryable(T) Interface
IQueryable Interface
IQueryable(T) Interface
IQueryProvider Interface
Lookup(TKey, TElement) Class
Queryable Class
System.Linq.Expressions
System.Net
System.Net.Browser
System.Net.NetworkInformation
System.Net.Sockets
System.Reflection
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System.Resources
System.Runtime
System.Runtime.CompilerServices
System.Runtime.ExceptionServices
System.Runtime.InteropServices
System.Runtime.InteropServices.Automation
System.Runtime.InteropServices.ComTypes
System.Runtime.InteropServices.WindowsRuntime
System.Runtime.Serialization
System.Runtime.Serialization.Json
System.Runtime.Versioning
System.Security
System.Security.Cryptography
System.Security.Cryptography.X509Certificates
System.Security.Permissions
System.Security.Principal
System.ServiceModel
System.ServiceModel.Channels
System.ServiceModel.Description
System.ServiceModel.Dispatcher
System.ServiceModel.Security
System.Text
System.Text.RegularExpressions
System.Threading
System.Threading.Tasks
System.Windows
System.Windows.Automation
System.Windows.Automation.Peers
System.Windows.Automation.Provider
System.Windows.Automation.Text
System.Windows.Controls
System.Windows.Controls.Primitives
System.Windows.Data
System.Windows.Documents
System.Windows.Ink
System.Windows.Input
System.Windows.Interop
System.Windows.Markup
System.Windows.Media
System.Windows.Media.Animation
System.Windows.Media.Effects
System.Windows.Media.Imaging
System.Windows.Media.Media3D
System.Windows.Navigation
System.Windows.Resources
System.Windows.Shapes
System.Windows.Threading
System.Xml
System.Xml.Linq
System.Xml.Schema
System.Xml.Serialization
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System.Linq Namespace

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

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

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>.

  ClassDescription
Public classEnumerableProvides a set of static (Shared in Visual Basic) methods for querying objects that implement IEnumerable<T>.
Public classEnumerableExecutorRepresents an expression tree and provides functionality to execute the expression tree after rewriting it.
Public classEnumerableExecutor<T>Infrastructure. Represents an expression tree and provides functionality to execute the expression tree after rewriting it.
Public classEnumerableQueryInfrastructure. Represents an IEnumerable as an EnumerableQuery data source.
Public classEnumerableQuery<T>Infrastructure. Represents an IEnumerable<T> collection as an IQueryable<T> data source.
Public classLookup<TKey, TElement>Represents a collection of keys each mapped to one or more values.
Public classQueryableProvides a set of static (Shared in Visual Basic) methods for querying data structures that implement IQueryable<T>.

  InterfaceDescription
Public interfaceIGrouping<TKey, TElement>Represents a collection of objects that have a common key.
Public interfaceILookup<TKey, TElement>Defines an indexer, size property, and Boolean search method for data structures that map keys to IEnumerable<T> sequences of values.
Public interfaceIOrderedEnumerable<TElement>Represents a sorted sequence.
Public interfaceIOrderedQueryableRepresents the result of a sorting operation.
Public interfaceIOrderedQueryable<T>Represents the result of a sorting operation.
Public interfaceIQueryableProvides functionality to evaluate queries against a specific data source wherein the type of the data is not specified.
Public interfaceIQueryable<T>Provides functionality to evaluate queries against a specific data source wherein the type of the data is known.
Public interfaceIQueryProviderDefines methods to create and execute queries that are described by an IQueryable object.

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