Type.Equals Método

public:
 bool Equals(Type ^ o);

public:
 virtual bool Equals(Type ^ o);

public bool Equals (Type o);

public virtual bool Equals (Type o);

override this.Equals : Type -> bool

Public Function Equals (o As Type) As Boolean

Public Overridable Function Equals (o As Type) As Boolean

Parámetros

Devoluciones

Boolean

Es true si el tipo del sistema subyacente de o coincide con el tipo del sistema subyacente del objeto Type actual; de lo contrario, es false.true if the underlying system type of o is the same as the underlying system type of the current Type; otherwise, false.

Implementaciones

Ejemplos

En el ejemplo siguiente Equals se usa para comparar dos tipos.The following example uses Equals to compare two types.

using System;
using System.Reflection;

class Example
{
    public static void Main()
    {

        Type a = typeof(System.String);
        Type b = typeof(System.Int32);

        Console.WriteLine("{0} == {1}: {2}", a, b, a.Equals(b));

        // The Type objects in a and b are not equal,
        // because they represent different types.

        a = typeof(Example);
        b = new Example().GetType();

        Console.WriteLine("{0} is equal to {1}: {2}", a, b, a.Equals(b));

        // The Type objects in a and b are equal,
        // because they both represent type Example.

        b = typeof(Type);

        Console.WriteLine("typeof({0}).Equals(typeof({1})): {2}", a, b, a.Equals(b));

        // The Type objects in a and b are not equal,
        // because variable a represents type Example
        // and variable b represents type Type.

        //Console.ReadLine();
    }
}

//
/* This code example produces the following output:
    System.String == System.Int32: False
    Example is equal to Example: True
    typeof(Example).Equals(typeof(System.Type)): False
*/

Imports System.Reflection



Class Example
    
    Public Shared Sub Main() 
        
        Dim a As Type = GetType(System.String)
        Dim b As Type = GetType(System.Int32)
        
        Console.WriteLine("{0} = {1}: {2}", a, b, a.Equals(b))
        ' The Type objects in a and b are not equal,
        ' because they represent different types.

        a = GetType(Example)
        b = New Example().GetType()
        Console.WriteLine("{0} is equal to {1}: {2}", a, b, a.Equals(b))
        ' The Type objects in a and b are equal,
        ' because they both represent type Example.

        b = GetType(Type)
        Console.WriteLine("typeof({0}).Equals(typeof({1})): {2}", a, b, a.Equals(b))
        ' The Type objects in a and b are not equal,
        ' because variable a represents type Example
        ' and variable b represents type Type.

        'Console.ReadLine()
    
    End Sub 
End Class
'
' This code example produces the following output:
'    System.String = System.Int32: False
'    Example is equal to Example: True
'    typeof(Example).Equals(typeof(System.Type)): False
'

Consulte también

• UnderlyingSystemType

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

public override bool Equals (object o);

override this.Equals : obj -> bool

Public Overrides Function Equals (o As Object) As Boolean

Parámetros

Devoluciones

Boolean

Es true si el tipo del sistema subyacente de o coincide con el tipo del sistema subyacente del objeto Type actual; de lo contrario, es false.true if the underlying system type of o is the same as the underlying system type of the current Type; otherwise, false. Este método también devuelve false si:This method also returns false if: El valor de

• o es null.

o is null.

o no se puede convertir en un objeto Type.

o cannot be cast or converted to a Type object.

Implementaciones

Ejemplos

En el ejemplo siguiente Equals(Object) se usa para comparar varias Type instancias de objeto con varias Object instancias.The following example uses Equals(Object) to compare various Type object instances with various Object instances.

using System;
using System.Collections.Generic;
using System.Reflection;

public class Example
{
   public static void Main()
   {
      Type t =typeof(int);
      Object obj1 = typeof(int).GetTypeInfo();
      IsEqualTo(t, obj1);

      Object obj2 = typeof(String);
      IsEqualTo(t, obj2);
      
      t = typeof(Object);
      Object obj3 = typeof(Object);
      IsEqualTo(t, obj3);
      
      t = typeof(List<>);
      Object obj4 = (new List<String>()).GetType();
      IsEqualTo(t, obj4);
      
      t = typeof(Type);
      Object obj5 = null;
      IsEqualTo(t, obj5);
   }
   
   private static void IsEqualTo(Type t, Object inst)
   {
      Type t2 = inst as Type;
      if (t2 != null)
         Console.WriteLine("{0} = {1}: {2}", t.Name, t2.Name,
                           t.Equals(t2));
      else
         Console.WriteLine("Cannot cast the argument to a type.");

      Console.WriteLine();                        
   }
}
// The example displays the following output:
//       Int32 = Int32: True
//       
//       Int32 = String: False
//       
//       Object = Object: True
//       
//       List`1 = List`1: False
//       
//       Cannot cast the argument to a type.

Imports System.Collections.Generic
Imports System.Reflection

Module Example
   Public Sub Main()
      Dim t As Type = GetType(Integer)
      Dim obj1 As Object = GetType(Integer).GetTypeInfo()
      IsEqualTo(t, obj1)

      Dim obj2 As Object = GetType(String)
      IsEqualTo(t, obj2)
      
      t = GetType(Object)
      Dim obj3 As Object = GetType(Object)
      IsEqualTo(t, obj3)
      
      t = GetType(List(Of ))
      Dim obj4 As Object = (New List(Of String())).GetType()
      IsEqualTo(t, obj4)
      
      t = GetType(Type)
      Dim obj5 As Object = Nothing
      IsEqualTo(t, obj5)
   End Sub
   
   Private Sub IsEqualTo(t As Type, inst As Object)
      Dim t2 As Type = TryCast(inst, Type)
      If t2 IsNot Nothing Then
         Console.WriteLine("{0} = {1}: {2}", t.Name, t2.Name,
                           t.Equals(t2))
      Else
         Console.WriteLine("Cannot cast the argument to a type.")
      End If
      Console.WriteLine()                        
   End Sub
End Module
' The example displays the following output:
'       Int32 = Int32: True
'       
'       Int32 = String: False
'       
'       Object = Object: True
'       
'       List`1 = List`1: False
'       
'       Cannot cast the argument to a type.

Dos cosas son especialmente importantes para el ejemplo:Two things are particularly worth noting about the example:

• La comparación de un Type objeto que representa un entero con un TypeInfo objeto que representa un valor devuelto por un entero true porque TypeInfo se deriva de Type .The comparison of a Type object that represents an integer with a TypeInfo object that represents an integer return true because TypeInfo is derived from Type.

• La comparación de un Type objeto que representa un IList<T> objeto (un tipo genérico abierto) con un List(Of String) objeto (un tipo genérico cerrado) devuelve false .The comparison of a Type object that represents a IList<T> object (an open generic type) with a List(Of String) object (a closed generic type) returns false.

Comentarios

Este método invalida Object.Equals.This method overrides Object.Equals. Convierte o a un objeto de tipo Type y llama al Type.Equals(Type) método.It casts o to an object of type Type and calls the Type.Equals(Type) method.

Consulte también

• UnderlyingSystemType