Updated: September 2008
Provides functionality to evaluate queries against a specific data source wherein the type of the data is known.
Assembly: System.Core (in System.Core.dll)
The interface is intended for implementation by query providers.
This interface inherits the IEnumerable(T) interface so that if it represents a query, the results of that query can be enumerated. Enumeration forces the expression tree associated with an object to be executed. Queries that do not return enumerable results are executed when the Execute(TResult)(Expression) method is called.
The definition of "executing an expression tree" is specific to a query provider. For example, it may involve translating the expression tree to a query language appropriate for an underlying data source.
The interface enables queries to be polymorphic. That is, because a query against an IQueryable data source is represented as an expression tree, it can be executed against different types of data sources.
Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.