Object Object Object Object Class

Definición

Admite todas las clases de la jerarquía de clases de .NET y proporciona servicios de bajo nivel a clases derivadas.Supports all classes in the .NET class hierarchy and provides low-level services to derived classes. Se trata de la clase base fundamental de todas las clases de .NET; es la raíz de la jerarquía de tipos.This is the ultimate base class of all .NET classes; it is the root of the type hierarchy.

public ref class Object
[System.Runtime.InteropServices.ClassInterface(System.Runtime.InteropServices.ClassInterfaceType.AutoDual)]
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public class Object
type obj = class
Public Class Object
Atributos

Ejemplos

En el ejemplo siguiente se define un tipo de punto Object derivado de la clase y se reemplazan muchos de los métodos Object virtuales de la clase.The following example defines a Point type derived from the Object class and overrides many of the virtual methods of the Object class. Además, en el ejemplo se muestra cómo llamar a muchos de los métodos estáticos y de Object instancia de la clase.In addition, the example shows how to call many of the static and instance methods of the Object class.

using namespace System;

// The Point class is derived from System.Object.
ref class Point
{
public:
    int x;
public:
    int y;

public:
    Point(int x, int y)
    {
        this->x = x;
        this->y = y;
    }

public:
    virtual bool Equals(Object^ obj) override
    {
        // If this and obj do not refer to the same type,
        // then they are not equal.
        if (obj->GetType() != this->GetType())
        {
            return false;
        }

        // Return true if  x and y fields match.
        Point^ other = (Point^) obj;
        return (this->x == other->x) && (this->y == other->y);
    }

    // Return the XOR of the x and y fields.
public:
    virtual int GetHashCode() override 
    {
        return x ^ y;
    }

    // Return the point's value as a string.
public:
    virtual String^ ToString() override 
    {
        return String::Format("({0}, {1})", x, y);
    }

    // Return a copy of this point object by making a simple
    // field copy.
public:
    Point^ Copy()
    {
        return (Point^) this->MemberwiseClone();
    }
};

int main()
{
    // Construct a Point object.
    Point^ p1 = gcnew Point(1, 2);

    // Make another Point object that is a copy of the first.
    Point^ p2 = p1->Copy();

    // Make another variable that references the first
    // Point object.
    Point^ p3 = p1;

    // The line below displays false because p1 and 
    // p2 refer to two different objects.
    Console::WriteLine(
        Object::ReferenceEquals(p1, p2));

    // The line below displays true because p1 and p2 refer
    // to two different objects that have the same value.
    Console::WriteLine(Object::Equals(p1, p2));

    // The line below displays true because p1 and 
    // p3 refer to one object.
    Console::WriteLine(Object::ReferenceEquals(p1, p3));

    // The line below displays: p1's value is: (1, 2)
    Console::WriteLine("p1's value is: {0}", p1->ToString());
}

// This code produces the following output.
//
// False
// True
// True
// p1's value is: (1, 2)
using System;

// The Point class is derived from System.Object.
class Point
{
    public int x, y;

    public Point(int x, int y) 
    {
        this.x = x;
        this.y = y;
    }
    
    public override bool Equals(object obj) 
    {
        // If this and obj do not refer to the same type, then they are not equal.
        if (obj.GetType() != this.GetType()) return false;

        // Return true if  x and y fields match.
        var other = (Point) obj;
        return (this.x == other.x) && (this.y == other.y);
    }

    // Return the XOR of the x and y fields.
    public override int GetHashCode() 
    {
        return x ^ y;
    }

    // Return the point's value as a string.
    public override String ToString() 
    {
        return $"({x}, {y})";
    }

    // Return a copy of this point object by making a simple field copy.
    public Point Copy() 
    {
        return (Point) this.MemberwiseClone();
    }
}

public sealed class App
{
    static void Main() 
    {
        // Construct a Point object.
        var p1 = new Point(1,2);

        // Make another Point object that is a copy of the first.
        var p2 = p1.Copy();

        // Make another variable that references the first Point object.
        var p3 = p1;

        // The line below displays false because p1 and p2 refer to two different objects.
        Console.WriteLine(Object.ReferenceEquals(p1, p2));

        // The line below displays true because p1 and p2 refer to two different objects that have the same value.
        Console.WriteLine(Object.Equals(p1, p2));
      
        // The line below displays true because p1 and p3 refer to one object.
        Console.WriteLine(Object.ReferenceEquals(p1, p3));
        
        // The line below displays: p1's value is: (1, 2)
        Console.WriteLine($"p1's value is: {p1.ToString()}");
    }
}

// This code example produces the following output:
//
// False
// True
// True
// p1's value is: (1, 2)
//
' The Point class is derived from System.Object.
Class Point
    Public x, y As Integer
    
    Public Sub New(ByVal x As Integer, ByVal y As Integer) 
        Me.x = x
        Me.y = y
    End Sub
    
    Public Overrides Function Equals(ByVal obj As Object) As Boolean 
        ' If Me and obj do not refer to the same type, then they are not equal.
        Dim objType As Type = obj.GetType()
        Dim meType  As Type = Me.GetType()
        If Not objType.Equals(meType) Then
            Return False
        End If 
        ' Return true if  x and y fields match.
        Dim other As Point = CType(obj, Point)
        Return Me.x = other.x AndAlso Me.y = other.y
    End Function 

    ' Return the XOR of the x and y fields.
    Public Overrides Function GetHashCode() As Integer 
        Return (x << 1) XOR y
    End Function 

    ' Return the point's value as a string.
    Public Overrides Function ToString() As String 
        Return $"({x}, {y})"
    End Function

    ' Return a copy of this point object by making a simple field copy.
    Public Function Copy() As Point 
        Return CType(Me.MemberwiseClone(), Point)
    End Function
End Class  

NotInheritable Public Class App
    Shared Sub Main() 
        ' Construct a Point object.
        Dim p1 As New Point(1, 2)
        
        ' Make another Point object that is a copy of the first.
        Dim p2 As Point = p1.Copy()
        
        ' Make another variable that references the first Point object.
        Dim p3 As Point = p1
        
        ' The line below displays false because p1 and p2 refer to two different objects.
        Console.WriteLine([Object].ReferenceEquals(p1, p2))

        ' The line below displays true because p1 and p2 refer to two different objects 
        ' that have the same value.
        Console.WriteLine([Object].Equals(p1, p2))

        ' The line below displays true because p1 and p3 refer to one object.
        Console.WriteLine([Object].ReferenceEquals(p1, p3))
        
        ' The line below displays: p1's value is: (1, 2)
        Console.WriteLine($"p1's value is: {p1.ToString()}")
    
    End Sub
End Class
' This example produces the following output:
'
' False
' True
' True
' p1's value is: (1, 2)
'

Comentarios

Normalmente, los lenguajes no requieren una clase para declarar Object la herencia de porque la herencia es implícita.Languages typically do not require a class to declare inheritance from Object because the inheritance is implicit.

Dado que todas las clases de .net se Objectderivan de, cada método Object definido en la clase está disponible en todos los objetos del sistema.Because all classes in .NET are derived from Object, every method defined in the Object class is available in all objects in the system. Las clases derivadas pueden invalidar algunos de estos métodos, entre los que se incluyen:Derived classes can and do override some of these methods, including:

  • Equals: Admite comparaciones entre objetos.Equals - Supports comparisons between objects.

  • Finalize: Realiza operaciones de limpieza antes de que un objeto se recupere automáticamente.Finalize - Performs cleanup operations before an object is automatically reclaimed.

  • GetHashCode: Genera un número que corresponde al valor del objeto para admitir el uso de una tabla hash.GetHashCode - Generates a number corresponding to the value of the object to support the use of a hash table.

  • ToString: Fabrica una cadena de texto legible que describe una instancia de la clase.ToString - Manufactures a human-readable text string that describes an instance of the class.

Consideraciones sobre el rendimientoPerformance Considerations

Si está diseñando una clase, como una colección, que debe controlar cualquier tipo de objeto, puede crear miembros de clase que acepten instancias de la Object clase.If you are designing a class, such as a collection, that must handle any type of object, you can create class members that accept instances of the Object class. Sin embargo, el proceso de conversión boxing y conversión unboxing de un tipo conlleva un costo de rendimiento.However, the process of boxing and unboxing a type carries a performance cost. Si sabe que la nueva clase va a administrar con frecuencia determinados tipos de valor, puede usar una de estas dos tácticas para minimizar el costo de la conversión boxing.If you know your new class will frequently handle certain value types you can use one of two tactics to minimize the cost of boxing.

  • Cree un método general que acepte un Object tipo y un conjunto de sobrecargas del método específico del tipo que acepten cada tipo de valor que espera que la clase Controle con frecuencia.Create a general method that accepts an Object type, and a set of type-specific method overloads that accept each value type you expect your class to frequently handle. Si existe un método específico del tipo que acepta el tipo de parámetro de llamada, no se produce ninguna conversión boxing y se invoca el método específico del tipo.If a type-specific method exists that accepts the calling parameter type, no boxing occurs and the type-specific method is invoked. Si no hay ningún argumento de método que coincida con el tipo de parámetro de llamada, se aplica la conversión boxing al parámetro y se invoca el método general.If there is no method argument that matches the calling parameter type, the parameter is boxed and the general method is invoked.

  • Diseñe el tipo y sus miembros para utilizar genéricos.Design your type and its members to use generics. El Common Language Runtime crea un tipo genérico cerrado cuando se crea una instancia de la clase y se especifica un argumento de tipo genérico.The common language runtime creates a closed generic type when you create an instance of your class and specify a generic type argument. El método genérico es específico del tipo y se puede invocar sin aplicar la conversión boxing al parámetro de llamada.The generic method is type-specific and can be invoked without boxing the calling parameter.

Aunque a veces es necesario desarrollar clases de uso general que aceptan y devuelven Object tipos, puede mejorar el rendimiento proporcionando también una clase específica del tipo para controlar un tipo de uso frecuente.Although it is sometimes necessary to develop general purpose classes that accept and return Object types, you can improve performance by also providing a type-specific class to handle a frequently used type. Por ejemplo, si se proporciona una clase específica para establecer y obtener valores booleanos, se elimina el costo de los valores booleanos de conversión boxing y unboxing.For example, providing a class that is specific to setting and getting Boolean values eliminates the cost of boxing and unboxing Boolean values.

Constructores

Object() Object() Object() Object()

Inicializa una nueva instancia de la clase Object.Initializes a new instance of the Object class.

Métodos

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

Determina si el objeto especificado es igual al objeto actual.Determines whether the specified object is equal to the current object.

Equals(Object, Object) Equals(Object, Object) Equals(Object, Object) Equals(Object, Object)

Determina si las instancias del objeto especificado se consideran iguales.Determines whether the specified object instances are considered equal.

Finalize() Finalize() Finalize() Finalize()

Permite que un objeto intente liberar recursos y realizar otras operaciones de limpieza antes de que sea reclamado por la recolección de elementos no utilizados.Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.

GetHashCode() GetHashCode() GetHashCode() GetHashCode()

Sirve como la función hash predeterminada.Serves as the default hash function.

GetType() GetType() GetType() GetType()

Obtiene el Type de la instancia actual.Gets the Type of the current instance.

MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

Crea una copia superficial del objeto Object actual.Creates a shallow copy of the current Object.

ReferenceEquals(Object, Object) ReferenceEquals(Object, Object) ReferenceEquals(Object, Object) ReferenceEquals(Object, Object)

Determina si las instancias de Object especificadas son la misma instancia.Determines whether the specified Object instances are the same instance.

ToString() ToString() ToString() ToString()

Devuelve una cadena que representa el objeto actual.Returns a string that represents the current object.

Se aplica a

Seguridad para subprocesos

Los miembros estáticos públicos (Shared en Visual Basic) de este tipo son seguros para subprocesos.Public static (Shared in Visual Basic) members of this type are thread safe. No se garantiza que los miembros de instancia sean seguros para subprocesos.Instance members are not guaranteed to be thread-safe.