Enum.GetUnderlyingType(Type) Método

Definición

Devuelve el tipo subyacente de la enumeración especificada.

public:
 static Type ^ GetUnderlyingType(Type ^ enumType);
public static Type GetUnderlyingType (Type enumType);
[System.Runtime.InteropServices.ComVisible(true)]
public static Type GetUnderlyingType (Type enumType);
static member GetUnderlyingType : Type -> Type
[<System.Runtime.InteropServices.ComVisible(true)>]
static member GetUnderlyingType : Type -> Type
Public Shared Function GetUnderlyingType (enumType As Type) As Type

Parámetros

enumType
Type

Enumeración cuyo tipo subyacente se recuperará.

Devoluciones

Type

Tipo subyacente de enumType.

Atributos

Excepciones

enumType es null.

enumType no es Enum.

Ejemplos

En el ejemplo siguiente se llama al GetUnderlyingType método para mostrar el tipo subyacente de algunos miembros de enumeración.

using System;

public class Example
{
   public static void Main()
   {
      Enum[] enumValues = { ConsoleColor.Red, DayOfWeek.Monday,
                            MidpointRounding.ToEven, PlatformID.Win32NT,
                            DateTimeKind.Utc, StringComparison.Ordinal };
      Console.WriteLine("{0,-10} {1, 18}   {2,15}\n",
                        "Member", "Enumeration", "Underlying Type");
      foreach (var enumValue in enumValues)
         DisplayEnumInfo(enumValue);
   }

   static void DisplayEnumInfo(Enum enumValue)
   {
      Type enumType = enumValue.GetType();
      Type underlyingType = Enum.GetUnderlyingType(enumType);
      Console.WriteLine("{0,-10} {1, 18}   {2,15}",
                        enumValue, enumType.Name, underlyingType.Name);
   }
}
// The example displays the following output:
//       Member            Enumeration   Underlying Type
//
//       Red              ConsoleColor             Int32
//       Monday              DayOfWeek             Int32
//       ToEven       MidpointRounding             Int32
//       Win32NT            PlatformID             Int32
//       Utc              DateTimeKind             Int32
//       Ordinal      StringComparison             Int32
open System

let displayEnumInfo (enumValue: Enum) =
    let enumType = enumValue.GetType()
    let underlyingType = Enum.GetUnderlyingType enumType
    printfn $"{enumValue,-10} {enumType.Name, 18}   {underlyingType.Name,15}"

let enumValues: Enum list =
    [ ConsoleColor.Red; DayOfWeek.Monday
      MidpointRounding.ToEven; PlatformID.Win32NT
      DateTimeKind.Utc; StringComparison.Ordinal ]

printfn "%-10s %18s   %15s\n" "Member" "Enumeration" "Underlying Type"
for enumValue in enumValues do
    displayEnumInfo enumValue

// The example displays the following output:
//       Member            Enumeration   Underlying Type
//
//       Red              ConsoleColor             Int32
//       Monday              DayOfWeek             Int32
//       ToEven       MidpointRounding             Int32
//       Win32NT            PlatformID             Int32
//       Utc              DateTimeKind             Int32
//       Ordinal      StringComparison             Int32
Module Example
   Public Sub Main()
      Dim enumValues() As [Enum] = { ConsoleColor.Red, DayOfWeek.Monday, 
                                     MidpointRounding.ToEven, PlatformID.Win32NT, 
                                     DateTimeKind.Utc, StringComparison.Ordinal }
      Console.WriteLine("{0,-10} {1, 18}   {2,15}", 
                        "Member", "Enumeration", "Underlying Type")
      Console.WriteLine()
      For Each enumValue In enumValues
         DisplayEnumInfo(enumValue)
      Next
   End Sub

   Sub DisplayEnumInfo(enumValue As [Enum])
      Dim enumType As Type = enumValue.GetType()
      Dim underlyingType As Type = [Enum].GetUnderlyingType(enumType)
      Console.WriteLine("{0,-10} {1, 18}   {2,15}",
                        enumValue, enumType.Name, underlyingType.Name)   
   End Sub
End Module
' The example displays the following output:
'       Member            Enumeration   Underlying Type
'       
'       Red              ConsoleColor             Int32
'       Monday              DayOfWeek             Int32
'       ToEven       MidpointRounding             Int32
'       Win32NT            PlatformID             Int32
'       Utc              DateTimeKind             Int32
'       Ordinal      StringComparison             Int32

Comentarios

La Enum estructura permite representar valores como constantes con nombre. El tipo de datos de los valores de la enumeración se conoce como su tipo subyacente. Por ejemplo, el tipo subyacente de la DayOfWeek enumeración, que consta de constantes que representan cada día de la semana (DayOfWeek.Monday, DayOfWeek.Tuesday, etc.), es Int32.

Se aplica a

Consulte también