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

Determines whether two sequences are equal by using the default equality comparer to compare elements.

Namespace:  System.Linq
Assembly:  System.Core (in System.Core.dll)
public static bool SequenceEqual<TSource>(
	this IQueryable<TSource> source1,
	IEnumerable<TSource> source2
)

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.

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. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).
ExceptionCondition
ArgumentNullException

source1 or source2 is null.

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

The following code example demonstrates how to use SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>) to determine whether two sequences are equal. In this example the sequences are equal.

class Pet
{
    public string Name { get; set; }
    public int Age { get; set; }
}

public static void SequenceEqualEx1()
{
    Pet pet1 = new Pet { Name = "Turbo", Age = 2 };
    Pet pet2 = new Pet { Name = "Peanut", Age = 8 };

    // Create two lists of pets.
    List<Pet> pets1 = new List<Pet> { pet1, pet2 };
    List<Pet> pets2 = new List<Pet> { pet1, pet2 };

    // Determine if the lists are equal. 
    bool equal = pets1.AsQueryable().SequenceEqual(pets2);

    Console.WriteLine(
        "The lists {0} equal.",
        equal ? "are" : "are not");
}

/*
    This code produces the following output:

    The lists are equal.
*/

The following code example compares two sequences that are not equal.

class Pet
{
    public string Name { get; set; }
    public int Age { get; set; }
}

public static void SequenceEqualEx2()
{
    Pet pet1 = new Pet() { Name = "Turbo", Age = 2 };
    Pet pet2 = new Pet() { Name = "Peanut", Age = 8 };

    // Create two lists of pets.
    List<Pet> pets1 = new List<Pet> { pet1, pet2 };
    List<Pet> pets2 = new List<Pet> { 
        new Pet { Name = "Turbo", Age = 2 },
        new Pet { Name = "Peanut", Age = 8 } 
    };

    // Determine if the lists are equal. 
    bool equal = pets1.AsQueryable().SequenceEqual(pets2);

    Console.WriteLine("The lists {0} equal.", equal ? "are" : "are NOT");
}

/*
    This code produces the following output:

    The lists are NOT equal.
*/

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.

.NET Framework

Supported in: 3.5
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