Type.IsEnum 属性

定义

命名空间:

System

程序集:

System.Runtime.dll

Source:

Type.cs

获取一个值，该值指示当前的 Type 是否表示枚举。

public:
 virtual property bool IsEnum { bool get(); };

public virtual bool IsEnum { get; }

member this.IsEnum : bool

Public Overridable ReadOnly Property IsEnum As Boolean

属性值

Boolean

如果当前 true 表示枚举，则为 Type；否则为 false。

示例

下面的示例演示如何使用 IsEnum 属性。

using namespace System;
enum class Color
{ Red, Blue, Green };

int main()
{
   Type^ colorType = Color::typeid;
   Type^ enumType = Enum::typeid;
   Console::WriteLine( "Is Color an enum? {0}.", colorType->IsEnum );
   Console::WriteLine( "Is Color a value type? {0}.", colorType->IsValueType );
   Console::WriteLine( "Is Enum an enum Type? {0}.", enumType->IsEnum );
   Console::WriteLine( "Is Enum a value type? {0}.", enumType->IsValueType );
}
// The example displays the following output:
//     Is Color an enum? True.
//     Is Color a value type? True.
//     Is Enum an enum type? False.
//     Is Enum a value type? False.

using System;
public enum Color
{ Red, Blue, Green }

class TestIsEnum
{
    public static void Main()
    {
       Type colorType = typeof(Color);
       Type enumType = typeof(Enum);
       Console.WriteLine("Is Color an enum? {0}.", colorType.IsEnum);
       Console.WriteLine("Is Color a value type? {0}.", colorType.IsValueType);
       Console.WriteLine("Is Enum an enum Type? {0}.", enumType.IsEnum);
       Console.WriteLine("Is Enum a value type? {0}.", enumType.IsValueType);
   }
}
// The example displays the following output:
//     Is Color an enum? True.
//     Is Color a value type? True.
//     Is Enum an enum type? False.
//     Is Enum a value type? False.

open System
type Color =
    | Red = 0
    | Blue = 1
    | Green = 2

let colorType = typeof<Color>
let enumType = typeof<Enum>
printfn $"Is Color an enum? {colorType.IsEnum}."
printfn $"Is Color a value type? {colorType.IsValueType}."
printfn $"Is Enum an enum Type? {enumType.IsEnum}."
printfn $"Is Enum a value type? {enumType.IsValueType}."
// The example displays the following output:
//     Is Color an enum? True.
//     Is Color a value type? True.
//     Is Enum an enum type? False.
//     Is Enum a value type? False.

Public Enum Color
    Red
    Blue
    Green
End Enum

Class Example
   Public Shared Sub Main()
        Dim colorType As Type = GetType(Color)
        Dim enumType As Type = GetType([Enum])
        Console.WriteLine("Is Color an enum? {0}.", colorType.IsEnum)
        Console.WriteLine("Is Color a value type? {0}.", colorType.IsValueType)
        Console.WriteLine("Is Enum an enum type? {0}.", enumType.IsEnum)
        Console.WriteLine("Is Enum a value type? {0}.", enumType.IsValueType)
    End Sub 
End Class
' The example displays the following output:
'     Is Color an enum? True.
'     Is Color a value type? True.
'     Is Enum an enum type? False.
'     Is Enum a value type? False.

注解

此属性为枚举返回 true ，但不返回 Enum 类型本身。

如果当前 Type 表示构造的泛型类型，则此属性适用于从中构造该类型的泛型类型定义。 例如，如果当前 Type 表示 MyGenericType<int> Visual Basic) MyGenericType(Of Integer) 中的 (，则此属性的值由 MyGenericType<T>确定。

如果当前 Type 表示泛型类型或泛型方法的定义中的类型参数，则此属性始终返回 false。

此属性为只读。

另请参阅

• TypeAttributes