Enumerable.SequenceEqual Enumerable.SequenceEqual Enumerable.SequenceEqual Enumerable.SequenceEqual Method

Definición

Determina si dos secuencias son iguales según un comparador de igualdad.Determines whether two sequences are equal according to an equality comparer.

Sobrecargas

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 si dos secuencias son iguales; para ello, se comparan sus elementos mediante el comparador de igualdad predeterminado para su tipo.Determines whether two sequences are equal by comparing the elements by using the default equality comparer for their type.

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 si dos secuencias son iguales; para ello, compara sus elementos utilizando una interfaz IEqualityComparer<T> especificada.Determines whether two sequences are equal by comparing their elements by using a specified IEqualityComparer<T>.

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 si dos secuencias son iguales; para ello, se comparan sus elementos mediante el comparador de igualdad predeterminado para su 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

Parámetros de tipo

TSource

Tipo de los elementos de las secuencias de entrada.The type of the elements of the input sequences.

Parámetros

first
IEnumerable<TSource>

IEnumerable<T> que se va a comparar con second.An IEnumerable<T> to compare to second.

second
IEnumerable<TSource>

IEnumerable<T> que se va a comparar con la primera secuencia.An IEnumerable<T> to compare to the first sequence.

Devoluciones

true si las dos secuencias de origen tienen la misma longitud y sus elementos correspondientes son iguales según el comparador de igualdad predeterminado para su tipo; de lo contrario, 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.

Excepciones

Ejemplos

En los siguientes ejemplos de código se muestra SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>) cómo utilizar para determinar si dos secuencias son iguales.The following code examples demonstrate how to use SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>) to determine whether two sequences are equal. En los dos primeros ejemplos, el método determina si las secuencias comparadas contienen referencias a los mismos objetos.In the first two examples, the method determines whether the compared sequences contain references to the same objects. En el tercer y cuarto ejemplo, el método compara los datos reales de los objetos dentro de las secuencias.In the third and fourth examples, the method compares the actual data of the objects within the sequences.

En este ejemplo, las secuencias son iguales.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.

En el ejemplo de código siguiente se comparan dos secuencias que no son iguales.The following code example compares two sequences that are not equal. Tenga en cuenta que las secuencias contienen datos idénticos, pero como los objetos que contienen tienen referencias diferentes, las secuencias no se consideran iguales.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)()
pets1.Add(pet1)
pets1.Add(pet2)

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.

Si desea comparar los datos reales de los objetos en las secuencias en lugar de comparar simplemente sus referencias, tiene que implementar la IEqualityComparer<T> interfaz genérica en la clase.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. En el ejemplo de código siguiente se muestra cómo implementar esta interfaz en una clase auxiliar y GetHashCode se Equals proporcionan los métodos y.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

Después de implementar esta interfaz, puede usar secuencias de ProductA objetos en el SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>) método, como se muestra en el ejemplo siguiente: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

Comentarios

El SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>) método enumera las dos secuencias de origen en paralelo y compara los elementos correspondientes utilizando el comparador de igualdad predeterminado TSourcepara 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.

El comparador de igualdad Defaultpredeterminado,, se usa para comparar los valores de los tipos.The default equality comparer, Default, is used to compare values of the types. Para comparar un tipo de datos personalizado, debe invalidar los Equals GetHashCode métodos y y, opcionalmente, implementar la IEquatable<T> interfaz genérica en el 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 obtener más información, vea la propiedad 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 si dos secuencias son iguales; para ello, compara sus elementos utilizando una interfaz IEqualityComparer<T> especificada.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

Parámetros de tipo

TSource

Tipo de los elementos de las secuencias de entrada.The type of the elements of the input sequences.

Parámetros

first
IEnumerable<TSource>

IEnumerable<T> que se va a comparar con second.An IEnumerable<T> to compare to second.

second
IEnumerable<TSource>

IEnumerable<T> que se va a comparar con la primera secuencia.An IEnumerable<T> to compare to the first sequence.

comparer
IEqualityComparer<TSource>

IEqualityComparer<T> que se va a utilizar para comparar elementos.An IEqualityComparer<T> to use to compare elements.

Devoluciones

true si las dos secuencias de origen tienen la misma longitud y sus elementos correspondientes son iguales según comparer; de lo contrario, false.true if the two source sequences are of equal length and their corresponding elements compare equal according to comparer; otherwise, false.

Excepciones

Ejemplos

En el ejemplo siguiente se muestra cómo implementar un comparador de igualdad que se puede SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) utilizar en el 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

Después de implementar este comparador, puede usar secuencias de Product objetos en el SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) método, como se muestra en el ejemplo siguiente: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

Comentarios

El SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) método enumera las dos secuencias de origen en paralelo y compara los elementos correspondientes utilizando el 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>. Si comparer Defaultes null, se utiliza el comparador de igualdad predeterminado,, para comparar los elementos.If comparer is null, the default equality comparer, Default, is used to compare elements.

Se aplica a