Artikel
11/17/2011

Queryable.SequenceEqual<TSource> Method (IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>)

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Determines whether two sequences are equal by using a specified IEqualityComparer<T> to compare elements.

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

Syntax

'Declaration
<ExtensionAttribute> _
Public Shared Function SequenceEqual(Of TSource) ( _
    source1 As IQueryable(Of TSource), _
    source2 As IEnumerable(Of TSource), _
    comparer As IEqualityComparer(Of TSource) _
) As Boolean

public static bool SequenceEqual<TSource>(
    this IQueryable<TSource> source1,
    IEnumerable<TSource> source2,
    IEqualityComparer<TSource> comparer
)

Type Parameters

TSource
The type of the elements of the input sequences.

Parameters

source1
Type: System.Linq.IQueryable<TSource>
An IQueryable<T> whose elements to compare to those of source2.

source2
Type: System.Collections.Generic.IEnumerable<TSource>
An IEnumerable<T> whose elements to compare to those of the first sequence.

comparer
Type: System.Collections.Generic.IEqualityComparer<TSource>
An IEqualityComparer<T> to use to compare elements.

Return Value

Type: System.Boolean
true if the two source sequences are of equal length and their corresponding elements compare equal; otherwise, false.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IQueryable<TSource>. When you use instance method syntax to call this method, omit the first parameter.

Exceptions

Exception	Condition
ArgumentNullException	source1 or source2 is nulla null reference (Nothing in Visual Basic).

Remarks

The SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) method generates a MethodCallExpression that represents calling SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<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 source1 parameter.

The query behavior that occurs as a result of executing an expression tree that represents calling SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) depends on the implementation of the type of the source1 parameter. The expected behavior is that it determines if the two source sequences are equal by using comparer to compare elements.

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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