Object.GetType Object.GetType Object.GetType Object.GetType Method

Definición

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

public:
 Type ^ GetType();
public Type GetType ();
member this.GetType : unit -> Type
Public Function GetType () As Type
Devoluciones

El tipo en tiempo de ejecución exacto de la instancia actual. The exact runtime type of the current instance.

Ejemplos

En el ejemplo de código siguiente se muestra que GetType devuelve el tipo en tiempo de ejecución de la instancia actual.The following code example demonstrates that GetType returns the runtime type of the current instance.

using namespace System;

public ref class MyBaseClass {};

public ref class MyDerivedClass: MyBaseClass{};

int main()
{
   MyBaseClass^ myBase = gcnew MyBaseClass;
   MyDerivedClass^ myDerived = gcnew MyDerivedClass;
   Object^ o = myDerived;
   MyBaseClass^ b = myDerived;
   Console::WriteLine( "mybase: Type is {0}", myBase->GetType() );
   Console::WriteLine( "myDerived: Type is {0}", myDerived->GetType() );
   Console::WriteLine( "object o = myDerived: Type is {0}", o->GetType() );
   Console::WriteLine( "MyBaseClass b = myDerived: Type is {0}", b->GetType() );
}

/*

This code produces the following output.

mybase: Type is MyBaseClass
myDerived: Type is MyDerivedClass
object o = myDerived: Type is MyDerivedClass
MyBaseClass b = myDerived: Type is MyDerivedClass 

*/
using System;

public class MyBaseClass {
}

public class MyDerivedClass: MyBaseClass {
}

public class Test 
{
   public static void Main() 
   {
      MyBaseClass myBase = new MyBaseClass();
      MyDerivedClass myDerived = new MyDerivedClass();
      object o = myDerived;
      MyBaseClass b = myDerived;

      Console.WriteLine("mybase: Type is {0}", myBase.GetType());
      Console.WriteLine("myDerived: Type is {0}", myDerived.GetType());
      Console.WriteLine("object o = myDerived: Type is {0}", o.GetType());
      Console.WriteLine("MyBaseClass b = myDerived: Type is {0}", b.GetType());
   }
}
// The example displays the following output:
//    mybase: Type is MyBaseClass
//    myDerived: Type is MyDerivedClass
//    object o = myDerived: Type is MyDerivedClass
//    MyBaseClass b = myDerived: Type is MyDerivedClass 
' Define a base and a derived class.
Public Class MyBaseClass
End Class 

Public Class MyDerivedClass : Inherits MyBaseClass
End Class 

Public Class Test
    Public Shared Sub Main() 
        Dim base As New MyBaseClass()
        Dim derived As New MyDerivedClass()
        Dim o As Object = derived
        Dim b As MyBaseClass = derived
        
        Console.WriteLine("base.GetType returns {0}", base.GetType())
        Console.WriteLine("derived.GetType returns {0}", derived.GetType())
        Console.WriteLine("Dim o As Object = derived; o.GetType returns {0}", o.GetType())
        Console.WriteLine("Dim b As MyBaseClass = derived; b.Type returns {0}", b.GetType())
    End Sub 
End Class 
' The example displays the following output:
'    base.GetType returns MyBaseClass
'    derived.GetType returns MyDerivedClass
'    Dim o As Object = derived; o.GetType returns MyDerivedClass
'    Dim b As MyBaseClass = derived; b.Type returns MyDerivedClass

Comentarios

Dado que System.Object es la clase base para todos los tipos en el sistema de tipos de .NET Framework, el GetType método puede utilizarse para devolver Type objetos que representan todos los tipos de .NET Framework.Because System.Object is the base class for all types in the .NET Framework type system, the GetType method can be used to return Type objects that represent all .NET Framework types. .NET Framework reconoce las cinco categorías de tipos siguientes:The .NET Framework recognizes the following five categories of types:

Para dos objetos x y y que tienen tipos idénticos en tiempo de ejecución, Object.ReferenceEquals(x.GetType(),y.GetType()) devuelve true.For two objects x and y that have identical runtime types, Object.ReferenceEquals(x.GetType(),y.GetType()) returns true. En el ejemplo siguiente se usa el GetType método con el ReferenceEquals método para determinar si un valor numérico es el mismo tipo que los otros dos valores numéricos.The following example uses the GetType method with the ReferenceEquals method to determine whether one numeric value is the same type as two other numeric values.

using System;

public class Example
{
   public static void Main()
   {
      int n1 = 12;
      int n2 = 82;
      long n3 = 12;
      
      Console.WriteLine("n1 and n2 are the same type: {0}",
                        Object.ReferenceEquals(n1.GetType(), n2.GetType()));
      Console.WriteLine("n1 and n3 are the same type: {0}",
                        Object.ReferenceEquals(n1.GetType(), n3.GetType()));
   }
}
// The example displays the following output:
//       n1 and n2 are the same type: True
//       n1 and n3 are the same type: False      
Module Example
   Public Sub Main()
      Dim n1 As Integer = 12
      Dim n2 As Integer = 82
      Dim n3 As Long = 12
      
      Console.WriteLine("n1 and n2 are the same type: {0}",
                        Object.ReferenceEquals(n1.GetType(), n2.GetType()))
      Console.WriteLine("n1 and n3 are the same type: {0}",
                        Object.ReferenceEquals(n1.GetType(), n3.GetType()))
   End Sub
End Module
' The example displays the following output:
'       n1 and n2 are the same type: True
'       n1 and n3 are the same type: False      

Nota

Para determinar si un objeto es un tipo específico, puede usar la palabra clave de comparación de tipo de su lenguaje o construir.To determine whether an object is a specific type, you can use your language's type comparison keyword or construct. Por ejemplo, puede usar el TypeOf…Is construir en Visual Basic o is palabra clave en C#.For example, you can use the TypeOf…Is construct in Visual Basic or the is keyword in C#.

El GetType método es heredado por todos los tipos que derivan de Object.The GetType method is inherited by all types that derive from Object. Esto significa que, además de utilizar la palabra clave de comparación de su propio lenguaje, se puede utilizar el GetType método para determinar el tipo de un objeto determinado, como se muestra en el ejemplo siguiente.This means that, in addition to using your own language's comparison keyword, you can use the GetType method to determine the type of a particular object, as the following example shows.

using System;

public class Example
{
   public static void Main()
   {
      object[] values = { (int) 12, (long) 10653, (byte) 12, (sbyte) -5,
                         16.3, "string" }; 
      foreach (var value in values) {
         Type t = value.GetType();
         if (t.Equals(typeof(byte)))
            Console.WriteLine("{0} is an unsigned byte.", value);
         else if (t.Equals(typeof(sbyte)))
            Console.WriteLine("{0} is a signed byte.", value);
         else if (t.Equals(typeof(int)))   
            Console.WriteLine("{0} is a 32-bit integer.", value);
         else if (t.Equals(typeof(long)))   
            Console.WriteLine("{0} is a 32-bit integer.", value);
         else if (t.Equals(typeof(double)))
            Console.WriteLine("{0} is a double-precision floating point.", 
                              value);
         else
            Console.WriteLine("'{0}' is another data type.", value);
      }
   }
}
// The example displays the following output:
//    12 is a 32-bit integer.
//    10653 is a 32-bit integer.
//    12 is an unsigned byte.
//    -5 is a signed byte.
//    16.3 is a double-precision floating point.
//    'string' is another data type.
Module Example
   Public Sub Main()
      Dim values() As Object = { 12, CLng(10653), CByte(12), 
                                 CSbyte(-5), 16.3, "string" } 
      For Each value In values
         Dim t AS Type = value.GetType()
         If t.Equals(GetType(Byte))
            Console.WriteLine("{0} is an unsigned byte.", value)
         ElseIf t.Equals(GetType(SByte))
            Console.WriteLine("{0} is a signed byte.", value)
         ElseIf t.Equals(GetType(Integer))   
            Console.WriteLine("{0} is a 32-bit integer.", value)
         ElseIf t.Equals(GetType(Long))   
            Console.WriteLine("{0} is a 32-bit integer.", value)
         ElseIf t.Equals(GetType(Double))
            Console.WriteLine("{0} is a double-precision floating point.", 
                              value)
         Else
            Console.WriteLine("'{0}' is another data type.", value)
         End If   
      Next      
   End Sub
End Module
' The example displays the following output:
'       12 is a 32-bit integer.
'       10653 is a 32-bit integer.
'       12 is an unsigned byte.
'       -5 is a signed byte.
'       16.3 is a double-precision floating point.
'       'string' is another data type.

El Type objeto expone los metadatos asociados con la clase del elemento actual Object.The Type object exposes the metadata associated with the class of the current Object.

Se aplica a

Consultar también