Export (0) Print
Expand All

IQueryable Interface

Provides functionality to evaluate queries against a specific data source wherein the type of the data is not specified.

Namespace:  System.Linq
Assemblies:   System.Linq.Expressions (in System.Linq.Expressions.dll)
  System.Core (in System.Core.dll)

type IQueryable =  
    interface 
        interface IEnumerable 
    end

The IQueryable type exposes the following members.

  NameDescription
Public propertySupported by Portable Class LibraryElementTypeGets the type of the element(s) that are returned when the expression tree associated with this instance of IQueryable is executed.
Public propertySupported by Portable Class LibraryExpressionGets the expression tree that is associated with the instance of IQueryable.
Public propertySupported by Portable Class LibraryProviderGets the query provider that is associated with this data source.
Top

  NameDescription
Public methodSupported by Portable Class LibraryGetEnumeratorReturns an enumerator that iterates through a collection. (Inherited from IEnumerable.)
Top

  NameDescription
Public Extension MethodSupported by Portable Class LibraryAsParallel()Overloaded. Enables parallelization of a query. (Defined by ParallelEnumerable.)
Public Extension MethodSupported by Portable Class LibraryAsParallel()Overloaded. (Defined by ParallelEnumerable.)
Public Extension MethodSupported by Portable Class LibraryAsQueryable()Overloaded. Converts an IEnumerable to an IQueryable. (Defined by Queryable.)
Public Extension MethodSupported by Portable Class LibraryAsQueryable()Overloaded. (Defined by Queryable.)
Public Extension MethodSupported by Portable Class LibraryCast(TResult)()Overloaded. Casts the elements of an IEnumerable to the specified type. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibraryCast(TResult)()Overloaded. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibraryCast(TResult)()Overloaded. Converts the elements of an IQueryable to the specified type. (Defined by Queryable.)
Public Extension MethodSupported by Portable Class LibraryOfType(TResult)()Overloaded. Filters the elements of an IEnumerable based on a specified type. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibraryOfType(TResult)()Overloaded. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibraryOfType(TResult)()Overloaded. Filters the elements of an IQueryable based on a specified type. (Defined by Queryable.)
Top

The IQueryable interface is intended for implementation by query providers. It is only supposed to be implemented by providers that also implement IQueryable(T). If the provider does not also implement IQueryable(T), the standard query operators cannot be used on the provider's data source.

The IQueryable interface inherits the IEnumerable interface so that if it represents a query, the results of that query can be enumerated. Enumeration causes the expression tree associated with an IQueryable object to be executed. The definition of "executing an expression tree" is specific to a query provider. For example, it may involve translating the expression tree to an appropriate query language for the underlying data source. Queries that do not return enumerable results are executed when the Execute method is called.

For more information about how to create your own LINQ provider, see LINQ: Building an IQueryable Provider on MSDN Blogs.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
Show:
© 2015 Microsoft