# Enumerable.SequenceEqualEnumerable.SequenceEqualEnumerable.SequenceEqualEnumerable.SequenceEqual Method

## Definição

Determina se duas sequências são iguais de acordo com um comparador de igualdade.Determines whether two sequences are equal according to an equality comparer.

## Sobrecargas

 SequenceEqual(IEnumerable, IEnumerable) SequenceEqual(IEnumerable, IEnumerable) SequenceEqual(IEnumerable, IEnumerable) SequenceEqual(IEnumerable, IEnumerable) Determina se duas sequências são iguais comparando os elementos usando o comparador de igualdade padrão para o tipo.Determines whether two sequences are equal by comparing the elements by using the default equality comparer for their type. SequenceEqual(IEnumerable, IEnumerable, IEqualityComparer) SequenceEqual(IEnumerable, IEnumerable, IEqualityComparer) SequenceEqual(IEnumerable, IEnumerable, IEqualityComparer) SequenceEqual(IEnumerable, IEnumerable, IEqualityComparer) Determina se duas sequências são iguais, comparando seus elementos usando um IEqualityComparer especificado.Determines whether two sequences are equal by comparing their elements by using a specified IEqualityComparer.

## SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)

Determina se duas sequências são iguais comparando os elementos usando o comparador de igualdade padrão para o tipo.Determines whether two sequences are equal by comparing the elements by using the default equality comparer for their type.

``````public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
static bool SequenceEqual(System::Collections::Generic::IEnumerable<TSource> ^ first, System::Collections::Generic::IEnumerable<TSource> ^ second);``````
``public static bool SequenceEqual<TSource> (this System.Collections.Generic.IEnumerable<TSource> first, System.Collections.Generic.IEnumerable<TSource> second);``
``static member SequenceEqual : seq<'Source> * seq<'Source> -> bool``
``````<Extension()>
Public Function SequenceEqual(Of TSource) (first As IEnumerable(Of TSource), second As IEnumerable(Of TSource)) As Boolean``````

#### Parâmetros de tipo

TSource

O tipo dos elementos das sequências de entrada.The type of the elements of the input sequences.

#### Parâmetros

first
IEnumerable<TSource>

Um IEnumerable<T> para comparar com `second`.An IEnumerable<T> to compare to `second`.

second
IEnumerable<TSource>

Um IEnumerable<T> para comparar com a primeira sequência.An IEnumerable<T> to compare to the first sequence.

#### Retornos

`true` se as duas sequências de origem forem de mesmo comprimento e seus elementos correspondentes forem iguais de acordo com o comparador de igualdade padrão para seu tipo; caso contrário, `false`.`true` if the two source sequences are of equal length and their corresponding elements are equal according to the default equality comparer for their type; otherwise, `false`.

#### Exceções

`first` ou `second` é `null`.`first` or `second` is `null`.

### Exemplos

Os exemplos de código a seguir demonstram como usar `SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)` para determinar se duas sequências são iguais.The following code examples demonstrate how to use `SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)` to determine whether two sequences are equal. Nos dois primeiros exemplos, o método determina se as sequências comparadas contêm referências aos mesmos objetos.In the first two examples, the method determines whether the compared sequences contain references to the same objects. No terceiro e quarto exemplos, o método compara os dados reais dos objetos dentro das sequências.In the third and fourth examples, the method compares the actual data of the objects within the sequences.

Neste exemplo, as sequências são iguais.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 };

bool equal = pets1.SequenceEqual(pets2);

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

/*
This code produces the following output:

The lists are equal.
*/
``````
``````Class Pet
Public Name As String
Public Age As Integer
End Class

Sub SequenceEqualEx1()
' Create two Pet objects.
Dim pet1 As New Pet With {.Name = "Turbo", .Age = 2}
Dim pet2 As New Pet With {.Name = "Peanut", .Age = 8}

' Create two lists of pets.
Dim pets1 As New List(Of Pet)(New Pet() {pet1, pet2})
Dim pets2 As New List(Of Pet)(New Pet() {pet1, pet2})

'Determine if the two lists are equal.
Dim equal As Boolean = pets1.SequenceEqual(pets2)

' Display the output.
Dim text As String = IIf(equal, "are", "are not")
MsgBox("The lists " & text & " equal.")

End Sub

' This code produces the following output:
'
' The lists are equal.
``````

O exemplo de código a seguir compara duas sequências que não são iguais.The following code example compares two sequences that are not equal. Observe que as sequências contêm dados idênticos, mas como os objetos que eles contêm têm referências diferentes, as sequências não são consideradas iguais.Note that the sequences contain identical data, but because the objects that they contain have different references, the sequences are not considered 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 } };

bool equal = pets1.SequenceEqual(pets2);

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

/*
This code produces the following output:

The lists are not equal.
*/
``````
``````' Create two Pet objects.
Dim pet1 As New Pet With {.Name = "Turbo", .Age = 2}
Dim pet2 As New Pet With {.Name = "Peanut", .Age = 8}

' Create two lists of pets.
Dim pets1 As New List(Of Pet)()

Dim pets2 As New List(Of Pet)()
pets2.Add(New Pet With {.Name = "Turbo", .Age = 2})
pets2.Add(New Pet With {.Name = "Peanut", .Age = 8})

' Determine if the two lists are equal.
Dim equal As Boolean = pets1.SequenceEqual(pets2)

' Display the output.
Dim text As String = IIf(equal, "are", "are not")
MsgBox("The lists " & text & " equal.")

' This code produces the following output:
'
' The lists are not equal.
``````

Se você quiser comparar os dados reais dos objetos nas sequências em vez de apenas comparar suas referências, você precisa implementar o IEqualityComparer<T> interface genérica em sua classe.If you want to compare the actual data of the objects in the sequences instead of just comparing their references, you have to implement the IEqualityComparer<T> generic interface in your class. O exemplo de código a seguir mostra como implementar essa interface em uma classe auxiliar e fornecer GetHashCode e Equals métodos.The following code example shows how to implement this interface in a helper class and provide GetHashCode and Equals methods.

``````public class ProductA: IEquatable<ProductA>
{
public string Name { get; set; }
public int Code { get; set; }

public bool Equals(ProductA other)
{
if (other is null)
return false;

return this.Name == other.Name && this.Code == other.Code;
}

public override bool Equals(object obj) => Equals(obj as ProductA);
public override int GetHashCode() => (Name, Code).GetHashCode();
}
``````
``````Public Class ProductA
Inherits IEquatable(Of ProductA)

Public Property Name As String
Public Property Code As Integer

Public Function Equals(ByVal other As ProductA) As Boolean
If other Is Nothing Then Return False
Return Me.Name = other.Name AndAlso Me.Code = other.Code
End Function

Public Overrides Function Equals(ByVal obj As Object) As Boolean
Return Equals(TryCast(obj, ProductA))
End Function

Public Overrides Function GetHashCode() As Integer
Return (Name, Code).GetHashCode()
End Function

End Class
``````

Depois de implementar essa interface, você pode usar sequências de `ProductA` objetos no `SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)` método, conforme mostrado no exemplo a seguir:After you implement this interface, you can use sequences of `ProductA` objects in the `SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)` method, as shown in the following example:

``````
ProductA[] storeA = { new ProductA { Name = "apple", Code = 9 },
new ProductA { Name = "orange", Code = 4 } };

ProductA[] storeB = { new ProductA { Name = "apple", Code = 9 },
new ProductA { Name = "orange", Code = 4 } };

bool equalAB = storeA.SequenceEqual(storeB);

Console.WriteLine("Equal? " + equalAB);

/*
This code produces the following output:

Equal? True
*/
``````
``````Dim storeA() As Product =
{New Product With {.Name = "apple", .Code = 9},
New Product With {.Name = "orange", .Code = 4}}

Dim storeB() As Product =
{New Product With {.Name = "apple", .Code = 9},
New Product With {.Name = "orange", .Code = 4}}

Dim equalAB = storeA.SequenceEqual(storeB)

Console.WriteLine("Equal? " & equalAB)

' This code produces the following output:

' Equal? True
``````

### Comentários

O `SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)` método enumera as duas sequências de origem em paralelo e compara os elementos correspondentes usando o comparador de igualdade padrão para `TSource`, Default.The `SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)` method enumerates the two source sequences in parallel and compares corresponding elements by using the default equality comparer for `TSource`, Default.

O comparador de igualdade padrão, Default, é usado para comparar valores de tipos.The default equality comparer, Default, is used to compare values of the types. Para comparar um tipo de dados personalizado, você precisa substituir os Equals e o GetHashCode métodos e, opcionalmente, implemente o IEquatable<T> interface genérica de tipo personalizado.To compare a custom data type, you need to override the Equals and the GetHashCode methods, and optionally implement the IEquatable<T> generic interface in the custom type. Para obter mais informações, consulte a propriedade Default.For more information, see the Default property.

## SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>)SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>)SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>)SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>)

Determina se duas sequências são iguais, comparando seus elementos usando um IEqualityComparer<T> especificado.Determines whether two sequences are equal by comparing their elements by using a specified IEqualityComparer<T>.

``````public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
static bool SequenceEqual(System::Collections::Generic::IEnumerable<TSource> ^ first, System::Collections::Generic::IEnumerable<TSource> ^ second, System::Collections::Generic::IEqualityComparer<TSource> ^ comparer);``````
``public static bool SequenceEqual<TSource> (this System.Collections.Generic.IEnumerable<TSource> first, System.Collections.Generic.IEnumerable<TSource> second, System.Collections.Generic.IEqualityComparer<TSource> comparer);``
``static member SequenceEqual : seq<'Source> * seq<'Source> * System.Collections.Generic.IEqualityComparer<'Source> -> bool``
``````<Extension()>
Public Function SequenceEqual(Of TSource) (first As IEnumerable(Of TSource), second As IEnumerable(Of TSource), comparer As IEqualityComparer(Of TSource)) As Boolean``````

#### Parâmetros de tipo

TSource

O tipo dos elementos das sequências de entrada.The type of the elements of the input sequences.

#### Parâmetros

first
IEnumerable<TSource>

Um IEnumerable<T> para comparar com `second`.An IEnumerable<T> to compare to `second`.

second
IEnumerable<TSource>

Um IEnumerable<T> para comparar com a primeira sequência.An IEnumerable<T> to compare to the first sequence.

comparer
IEqualityComparer<TSource>

Um IEqualityComparer<T> a ser usado para comparar elementos.An IEqualityComparer<T> to use to compare elements.

#### Retornos

`true` se as duas sequências de origem tiverem o mesmo tamanho e seus elementos correspondentes forem comparados como iguais de acordo com o `comparer`; caso contrário, `false`.`true` if the two source sequences are of equal length and their corresponding elements compare equal according to `comparer`; otherwise, `false`.

#### Exceções

`first` ou `second` é `null`.`first` or `second` is `null`.

### Exemplos

O exemplo a seguir mostra como implementar um comparador de igualdade que pode ser usado no SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) método.The following example shows how to implement an equality comparer that can be used in the SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) method.

``````public class Product
{
public string Name { get; set; }
public int Code { get; set; }
}

// Custom comparer for the Product class
class ProductComparer : IEqualityComparer<Product>
{
// Products are equal if their names and product numbers are equal.
public bool Equals(Product x, Product y)
{

//Check whether the compared objects reference the same data.
if (Object.ReferenceEquals(x, y)) return true;

//Check whether any of the compared objects is null.
if (Object.ReferenceEquals(x, null) || Object.ReferenceEquals(y, null))
return false;

//Check whether the products' properties are equal.
return x.Code == y.Code && x.Name == y.Name;
}

// If Equals() returns true for a pair of objects
// then GetHashCode() must return the same value for these objects.

public int GetHashCode(Product product)
{
//Check whether the object is null
if (Object.ReferenceEquals(product, null)) return 0;

//Get hash code for the Name field if it is not null.
int hashProductName = product.Name == null ? 0 : product.Name.GetHashCode();

//Get hash code for the Code field.
int hashProductCode = product.Code.GetHashCode();

//Calculate the hash code for the product.
return hashProductName ^ hashProductCode;
}

}
``````
``````Public Class Product
Public Property Name As String
Public Property Code As Integer
End Class

' Custom comparer for the Product class
Public Class ProductComparer
Implements IEqualityComparer(Of Product)

Public Function Equals1(
ByVal x As Product,
ByVal y As Product
) As Boolean Implements IEqualityComparer(Of Product).Equals

' Check whether the compared objects reference the same data.
If x Is y Then Return True

'Check whether any of the compared objects is null.
If x Is Nothing OrElse y Is Nothing Then Return False

' Check whether the products' properties are equal.
Return (x.Code = y.Code) AndAlso (x.Name = y.Name)
End Function

Public Function GetHashCode1(
ByVal product As Product
) As Integer Implements IEqualityComparer(Of Product).GetHashCode

' Check whether the object is null.
If product Is Nothing Then Return 0

' Get hash code for the Name field if it is not null.
Dim hashProductName =
If(product.Name Is Nothing, 0, product.Name.GetHashCode())

' Get hash code for the Code field.
Dim hashProductCode = product.Code.GetHashCode()

' Calculate the hash code for the product.
Return hashProductName Xor hashProductCode
End Function
End Class
``````

Depois de implementar esse comparador, você pode usar sequências de `Product` objetos no SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) método, conforme mostrado no exemplo a seguir:After you implement this comparer, you can use sequences of `Product` objects in the SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) method, as shown in the following example:

``````
Product[] storeA = { new Product { Name = "apple", Code = 9 },
new Product { Name = "orange", Code = 4 } };

Product[] storeB = { new Product { Name = "apple", Code = 9 },
new Product { Name = "orange", Code = 4 } };

bool equalAB = storeA.SequenceEqual(storeB, new ProductComparer());

Console.WriteLine("Equal? " + equalAB);

/*
This code produces the following output:

Equal? True
*/

``````
``````
Dim storeA() As Product =
{New Product With {.Name = "apple", .Code = 9},
New Product With {.Name = "orange", .Code = 4}}

Dim storeB() As Product =
{New Product With {.Name = "apple", .Code = 9},
New Product With {.Name = "orange", .Code = 4}}

Dim equalAB = storeA.SequenceEqual(storeB, New ProductComparer())

Console.WriteLine("Equal? " & equalAB)

' This code produces the following output:

' Equal? True
``````

### Comentários

O SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) método enumera as duas sequências de origem em paralelo e compara os elementos correspondentes usando especificado IEqualityComparer<T>.The SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) method enumerates the two source sequences in parallel and compares corresponding elements by using the specified IEqualityComparer<T>. Se `comparer` está `null`, o comparador de igualdade padrão, Default, é usado para comparar elementos.If `comparer` is `null`, the default equality comparer, Default, is used to compare elements.