Queryable::Contains<TSource> Method (IQueryable<TSource>^, TSource)

.NET Framework (current version)

Determines whether a sequence contains a specified element by using the default equality comparer.

Namespace: System.Linq
Assembly: System.Core (in System.Core.dll)

Syntax

public:
generic<typename TSource>
[ExtensionAttribute]
static bool Contains(
	IQueryable<TSource>^ source,
	TSource item
)

Parameters

source: Type: System.Linq::IQueryable<TSource>^
An IQueryable<T> in which to locate item.

item: Type: TSource
The object to locate in the sequence.

Return Value

Type: System::Boolean

true if the input sequence contains an element that has the specified value; otherwise, false.

Type Parameters

TSource: The type of the elements of source.

Exceptions

Exception	Condition
ArgumentNullException	source is null.

The Contains<TSource>(IQueryable<TSource>^, TSource) method generates a MethodCallExpression that represents calling Contains<TSource>(IQueryable<TSource>^, TSource) itself as a constructed generic method. It then passes the MethodCallExpression to the Execute<TResult>(Expression^) method of the IQueryProvider represented by the Provider property of the source parameter.

The query behavior that occurs as a result of executing an expression tree that represents calling Contains<TSource>(IQueryable<TSource>^, TSource) depends on the implementation of the type of the source parameter. The expected behavior is that it determines if source contains item.

Examples

The following code example demonstrates how to use Contains<TSource>(IQueryable<TSource>^, TSource) to determine whether a sequence contains a specific element.

C++

No code example is currently available or this language may not be supported.

Version Information

Universal Windows Platform
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.1
Windows Phone
Available since 8.1