ValueType.Equals(Object) Método

public:
 override bool Equals(System::Object ^ obj);

public override bool Equals (object obj);

public override bool Equals (object? obj);

override this.Equals : obj -> bool

Public Overrides Function Equals (obj As Object) As Boolean

Parámetros

Devoluciones

Boolean

true si obj y esta instancia son del mismo tipo y representan el mismo valor; en caso contrario, false.true if obj and this instance are the same type and represent the same value; otherwise, false.

Ejemplos

En el ejemplo siguiente se muestra cómo Equals se puede reemplazar el método por un tipo de valor derivado.The following example demonstrates how the Equals method can be overridden by a derived value type.

public ref struct Complex
{
public:
   double m_Re;
   double m_Im;
   virtual bool Equals( Object^ ob ) override
   {
      if ( dynamic_cast<Complex^>(ob) )
      {
         Complex^ c = dynamic_cast<Complex^>(ob);
         return m_Re == c->m_Re && m_Im == c->m_Im;
      }
      else
      {
         return false;
      }
   }

   virtual int GetHashCode() override
   {
      return m_Re.GetHashCode() ^ m_Im.GetHashCode();
   }
};

public struct Complex
{
    public double m_Re;
    public double m_Im;

    public override bool Equals( object ob ){
        if( ob is Complex ) {
            Complex c = (Complex) ob;
            return m_Re==c.m_Re && m_Im==c.m_Im;
        }
        else {
            return false;
        }
    }

    public override int GetHashCode(){
        return m_Re.GetHashCode() ^ m_Im.GetHashCode();
    }
}

Public Structure Complex
   Private m_Re As Double
   Private m_Im As Double
       
   Public Overloads Function Equals(ob As Object) As Boolean
      If TypeOf ob Is Complex Then
         Dim c As Complex = CType(ob, Complex)
         Return m_Re = c.m_Re And m_Im = c.m_Im
      Else
         Return False
      End If
   End Function
   
   
   Public Overloads Function GetHashCode() As Integer
      Return m_Re.GetHashCode() ^ m_Im.GetHashCode()
   End Function

End Structure

Comentarios

El ValueType.Equals(Object) método invalida Object.Equals(Object) y proporciona la implementación predeterminada de igualdad de valores para todos los tipos de valor en el .NET Framework.The ValueType.Equals(Object) method overrides Object.Equals(Object) and provides the default implementation of value equality for all value types in the .NET Framework.

La implementación predeterminada llama a Object.Equals(Object) en cada campo de la instancia actual y obj y devuelve true si todos los campos son iguales.The default implementation calls Object.Equals(Object) on each field of the current instance and obj and returns true if all fields are equal.

Notas del Windows RuntimeNotes for the Windows Runtime

Cuando se llama al Equals método en una estructura de Windows Runtime, proporciona el comportamiento predeterminado para los tipos de valor que no se invalidan Equals .When you call the Equals method on a Windows Runtime structure, it provides the default behavior for value types that don't override Equals. Esto forma parte de la compatibilidad que proporciona el .NET Framework para la Windows Runtime (vea compatibilidad con .NET Framework para aplicaciones de la tienda Windows y Windows Runtime).This is part of the support that the .NET Framework provides for the Windows Runtime (see .NET Framework Support for Windows Store Apps and Windows Runtime). Windows Runtime estructuras no pueden invalidarse Equals , incluso si están escritas con C# o Visual Basic, porque no pueden tener métodos.Windows Runtime structures can't override Equals, even if they're written with C# or Visual Basic, because they can't have methods. (Además, las estructuras del propio Windows Runtime no heredan ValueType ). Sin embargo, parece que tienen ToString Equals GetHashCode los métodos, y cuando se usan en el código de C# o Visual Basic, y el .NET Framework proporciona el comportamiento predeterminado de estos métodos.(In addition, structures in the Windows Runtime itself don't inherit ValueType.) However, they appear to have ToString, Equals, and GetHashCode methods when you use them in your C# or Visual Basic code, and the .NET Framework provides the default behavior for these methods.

Se aplica a