Enum.GetUnderlyingType(Type) 方法

定义

返回指定枚举的基础类型。Returns the underlying type of the specified enumeration.

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

参数

enumType
Type

基础类型将被检索的枚举。The enumeration whose underlying type will be retrieved.

返回

enumType 的基础类型。The underlying type of enumType.

属性

异常

enumTypenullenumType is null.

enumType 不是 EnumenumType is not an Enum.

示例

下面的示例调用 GetUnderlyingType 方法来显示某些枚举成员的基础类型。The following example calls the GetUnderlyingType method to display the underlying type of some enumeration members.

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
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

注解

Enum 结构允许将值表示为命名常量。The Enum structure enables values to be represented as named constants. 枚举值的数据类型称为其基础类型。The data type of the enumeration's values is known as its underlying type. 例如,DayOfWeek 枚举的基础类型,其中包含表示一周中每一天的常量(DayOfWeek.MondayDayOfWeek.Tuesday,等等 Int32)。For example, the underlying type of the DayOfWeek enumeration, which consists of constants that represent each day of the week (DayOfWeek.Monday, DayOfWeek.Tuesday, and so on), is Int32.

适用于

另请参阅