Object Object Object Object Class

Definición

Admite todas las clases de la jerarquía de clases de .NET Framework y proporciona servicios de bajo nivel a las clases derivadas.Supports all classes in the .NET Framework class hierarchy and provides low-level services to derived classes. Se trata de la clase base fundamental de todas las clases de .NET Framework; es la raíz de la jerarquía de tipos.This is the ultimate base class of all classes in the .NET Framework; 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 que se deriva el Object clase e invalida muchos de los métodos virtuales de la Object 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, el ejemplo muestra cómo llamar a muchos de los métodos estático y los métodos de la instancia la Object 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.
        Point 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 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();
    }
}

public sealed class App {
    static void Main() 
    {
        // Construct a Point object.
        Point p1 = new 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 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 String.Format("({0}, {1})", 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: {0}", p1.ToString())
    
    End Sub
End Class
' This example produces the following output:
'
' False
' True
' True
' p1's value is: (1, 2)
'

Comentarios

Idiomas normalmente no requieren una clase para declarar la herencia de Object porque la herencia está implícita.Languages typically do not require a class to declare inheritance from Object because the inheritance is implicit.

Dado que se derivan todas las clases de .NET Framework Object, cada método definido en el Object clase está disponible en todos los objetos en el sistema.Because all classes in the .NET Framework are derived from Object, every method defined in the Object class is available in all objects in the system. Las clases derivadas pueden e invalidar algunos de estos métodos, incluidos: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 reclama 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 -Crea 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 unboxing a un tipo implica un costo de rendimiento.However, the process of boxing and unboxing a type carries a performance cost. Si conoce que la nueva clase controlará con frecuencia ciertos tipos de valor puede utilizar uno de 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.

  • Crear un método general que acepta un Object tipo y un conjunto de sobrecargas del método específico del tipo que acepte cada tipo de valor que se 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 no existe un método específico del tipo que acepta el tipo de parámetro que realiza la llamada, 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 que realiza la llamada, se aplica el 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 su tipo y sus miembros para utilizar genéricos.Design your type and its members to use generics. Common language runtime crea un tipo genérico cerrado cuando se crea una instancia de la clase y especificar 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 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 propósito general que aceptan y devuelven Object tipos, puede mejorar el rendimiento al proporcionar 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, elimina el costo de conversión boxing y unboxing valores booleanos que proporciona una clase que es específica para establecer y obtener los valores booleanos.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 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

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