TypeAttributes TypeAttributes TypeAttributes TypeAttributes Enum


指定型別屬性 (Attribute)。Specifies type attributes.

此列舉具有 FlagsAttribute 個屬性允許以位元方式合併其成員值。

public enum class TypeAttributes
public enum TypeAttributes
type TypeAttributes = 
Public Enum TypeAttributes


Abstract Abstract Abstract Abstract 128

指定此類型為抽象。Specifies that the type is abstract.

AnsiClass AnsiClass AnsiClass AnsiClass 0

LPTSTR 被解譯為 ANSI。LPTSTR is interpreted as ANSI.

AutoClass AutoClass AutoClass AutoClass 131072

LPTSTR 會自動被解譯。LPTSTR is interpreted automatically.

AutoLayout AutoLayout AutoLayout AutoLayout 0

指定類別欄位會由 Common Language Runtime 自動配置。Specifies that class fields are automatically laid out by the common language runtime.

BeforeFieldInit BeforeFieldInit BeforeFieldInit BeforeFieldInit 1048576

指定呼叫型別的靜態 (Static) 方法時不要強制系統將型別初始化。Specifies that calling static methods of the type does not force the system to initialize the type.

Class Class Class Class 0

指定此類型為類別。Specifies that the type is a class.

ClassSemanticsMask ClassSemanticsMask ClassSemanticsMask ClassSemanticsMask 32

指定類別語意 (Semantics) 資訊;目前的類別為依照上下文而定的 (否則為變動的)。Specifies class semantics information; the current class is contextful (else agile).

CustomFormatClass CustomFormatClass CustomFormatClass CustomFormatClass 196608

LPSTR 由部分實作特定的方式進行解譯,這可能會擲回 NotSupportedExceptionLPSTR is interpreted by some implementation-specific means, which includes the possibility of throwing a NotSupportedException. 不會用於 Microsoft .NET Framework.NET Framework 實作中。Not used in the Microsoft implementation of the .NET Framework.NET Framework.

CustomFormatMask CustomFormatMask CustomFormatMask CustomFormatMask 12582912

用於擷取機器碼互通性的非標準編碼資訊。Used to retrieve non-standard encoding information for native interop. 未指定這些 2 位元值的含義。The meaning of the values of these 2 bits is unspecified. 不會用於 Microsoft .NET Framework.NET Framework 實作中。Not used in the Microsoft implementation of the .NET Framework.NET Framework.

ExplicitLayout ExplicitLayout ExplicitLayout ExplicitLayout 16

指定類別欄位配置於指定位移 (Offset)。Specifies that class fields are laid out at the specified offsets.

HasSecurity HasSecurity HasSecurity HasSecurity 262144

型別具有關聯的安全性。Type has security associate with it.

Import Import Import Import 4096

指定類別或介面從其他的模組匯入。Specifies that the class or interface is imported from another module.

Interface Interface Interface Interface 32

指定此類型為介面。Specifies that the type is an interface.

LayoutMask LayoutMask LayoutMask LayoutMask 24

指定類別配置資訊。Specifies class layout information.

NestedAssembly NestedAssembly NestedAssembly NestedAssembly 5

指定類別是使用組件 (Assembly) 可視性所產生的巢狀,因此只能藉由組件中的方法存取。Specifies that the class is nested with assembly visibility, and is thus accessible only by methods within its assembly.

NestedFamANDAssem NestedFamANDAssem NestedFamANDAssem NestedFamANDAssem 6

指定類別是使用組件和家族可視性所產生的巢狀,因此只能藉由在家族和組件交集中的方法存取。Specifies that the class is nested with assembly and family visibility, and is thus accessible only by methods lying in the intersection of its family and assembly.

NestedFamily NestedFamily NestedFamily NestedFamily 4

指定類別是使用家族可視性所產生的巢狀,因此只能藉由其型別和任何衍生型別中的方法存取。Specifies that the class is nested with family visibility, and is thus accessible only by methods within its own type and any derived types.

NestedFamORAssem NestedFamORAssem NestedFamORAssem NestedFamORAssem 7

指定類別是使用家族或組件可視性所產生的巢狀,因此只能藉由在家族和組件聯集中的方法存取。Specifies that the class is nested with family or assembly visibility, and is thus accessible only by methods lying in the union of its family and assembly.

NestedPrivate NestedPrivate NestedPrivate NestedPrivate 3

指定類別是使用私用 (Private) 可視性所產生的巢狀。Specifies that the class is nested with private visibility.

NestedPublic NestedPublic NestedPublic NestedPublic 2

指定類別是使用公用 (Public) 可視性所產生的巢狀。Specifies that the class is nested with public visibility.

NotPublic NotPublic NotPublic NotPublic 0

指定類別不是公用。Specifies that the class is not public.

Public Public Public Public 1

指定類別是公用。Specifies that the class is public.

ReservedMask ReservedMask ReservedMask ReservedMask 264192

保留供執行階段使用的屬性。Attributes reserved for runtime use.

RTSpecialName RTSpecialName RTSpecialName RTSpecialName 2048

執行階段應該檢查名稱編碼方式。Runtime should check name encoding.

Sealed Sealed Sealed Sealed 256

指定類別為固定的,並且無法擴充。Specifies that the class is concrete and cannot be extended.

SequentialLayout SequentialLayout SequentialLayout SequentialLayout 8

指定類別欄位會循序配置,依照欄位發出至中繼資料 (Metadata) 的順序。Specifies that class fields are laid out sequentially, in the order that the fields were emitted to the metadata.

Serializable Serializable Serializable Serializable 8192

指定類別可以序列化。Specifies that the class can be serialized.

SpecialName SpecialName SpecialName SpecialName 1024

指定類別在名稱所表示的方法中為特殊的。Specifies that the class is special in a way denoted by the name.

StringFormatMask StringFormatMask StringFormatMask StringFormatMask 196608

用來擷取機器碼互通性 (Interoperability) 的字串資訊。Used to retrieve string information for native interoperability.

UnicodeClass UnicodeClass UnicodeClass UnicodeClass 65536

LPTSTR 被解譯為 UNICODE。LPTSTR is interpreted as UNICODE.

VisibilityMask VisibilityMask VisibilityMask VisibilityMask 7

指定型別可視性資訊。Specifies type visibility information.

WindowsRuntime WindowsRuntime WindowsRuntime WindowsRuntime 16384

指定 Windows 執行階段Windows Runtime 類型。Specifies a Windows 執行階段Windows Runtime type.


下列範例會擷取的值Attributes屬性Type物件,代表許多不同的類型,並接著會判斷是否已設定個別的屬性旗標。The following example retrieves the value of the Attributes property for Type objects that represent a number of different types, and then determines whether individual attribute flags have been set.

using System;
using System.Reflection;

internal struct S
    public int X;

public abstract class Example
    protected sealed class NestedClass {}

    public interface INested {}

    public static void Main()
        // Create an array of types.
        Type[] types = { typeof(Example), typeof(NestedClass),
                         typeof(INested), typeof(S) };

        foreach (var t in types) 
           Console.WriteLine("Attributes for type {0}:", t.Name);

           TypeAttributes attr = t.Attributes;

           // To test for visibility attributes, you must use the visibility mask.
           TypeAttributes visibility = attr & TypeAttributes.VisibilityMask;
           switch (visibility)
               case TypeAttributes.NotPublic:
                   Console.WriteLine("   ...is not public");
               case TypeAttributes.Public:
                   Console.WriteLine("   ...is public");
               case TypeAttributes.NestedPublic:
                   Console.WriteLine("   ...is nested and public");
               case TypeAttributes.NestedPrivate:
                   Console.WriteLine("   ...is nested and private");
               case TypeAttributes.NestedFamANDAssem:
                   Console.WriteLine("   ...is nested, and inheritable only within the assembly" +
                      "\n         (cannot be declared in C#)");
               case TypeAttributes.NestedAssembly:
                   Console.WriteLine("   ...is nested and internal");
               case TypeAttributes.NestedFamily:
                   Console.WriteLine("   ...is nested and protected");
               case TypeAttributes.NestedFamORAssem:
                   Console.WriteLine("   ...is nested and protected internal");

           // Use the layout mask to test for layout attributes.
           TypeAttributes layout = attr & TypeAttributes.LayoutMask;
           switch (layout)
               case TypeAttributes.AutoLayout:
                   Console.WriteLine("   ...is AutoLayout");
               case TypeAttributes.SequentialLayout:
                   Console.WriteLine("   ...is SequentialLayout");
               case TypeAttributes.ExplicitLayout:
                   Console.WriteLine("   ...is ExplicitLayout");

           // Use the class semantics mask to test for class semantics attributes.
           TypeAttributes classSemantics = attr & TypeAttributes.ClassSemanticsMask;
           switch (classSemantics)
               case TypeAttributes.Class:
                   if (t.IsValueType)
                       Console.WriteLine("   ...is a value type");
                       Console.WriteLine("   ...is a class");
               case TypeAttributes.Interface:
                   Console.WriteLine("   ...is an interface");

           if ((attr & TypeAttributes.Abstract) != 0)
               Console.WriteLine("   ...is abstract");

           if ((attr & TypeAttributes.Sealed) != 0)
               Console.WriteLine("   ...is sealed");
// The example displays the following output:
// Attributes for type Example:
//    ...is public
//    ...is AutoLayout
//    ...is a class
//    ...is abstract

// Attributes for type NestedClass:
//    ...is nested and protected
//    ...is AutoLayout
//    ...is a class
//    ...is sealed

// Attributes for type INested:
//    ...is nested and public
//    ...is AutoLayout
//    ...is an interface
//    ...is abstract

// Attributes for type S:
//    ...is not public
//    ...is SequentialLayout
//    ...is a value type
//    ...is sealed
Imports System.Reflection

Friend Structure S
    Public X As Integer
End Structure

Public MustInherit Class Example
    Protected NotInheritable Class NestedClass
    End Class

    Public Interface INested
    End Interface

    Public Shared Sub Main()
        ' Create an array of types.
        Dim types() As Type = { GetType(Example), GetType(NestedClass),
                                GetType(INested), GetType(S) }

        For Each t In types
           Console.WriteLine("Attributes for type {0}:", t.Name)

           Dim attr As TypeAttributes = t.Attributes

           ' Use the visibility mask to test for visibility attributes.
           Dim visibility As TypeAttributes = attr And TypeAttributes.VisibilityMask
           Select Case visibility
               Case TypeAttributes.NotPublic:
                   Console.WriteLine("   ...is not Public")
               Case TypeAttributes.Public:
                   Console.WriteLine("   ...is Public")
               Case TypeAttributes.NestedPublic:
                   Console.WriteLine("   ...is nested and Public")
               Case TypeAttributes.NestedPrivate:
                   Console.WriteLine("   ...is nested and Private")
               Case TypeAttributes.NestedFamANDAssem:
                   Console.WriteLine("   ...is nested, and inheritable only within the assembly" & _
                      vbLf & "         (cannot be declared in Visual Basic)")
               Case TypeAttributes.NestedAssembly:
                   Console.WriteLine("   ...is nested and Friend")
               Case TypeAttributes.NestedFamily:
                   Console.WriteLine("   ...is nested and Protected")
               Case TypeAttributes.NestedFamORAssem:
                   Console.WriteLine("   ...is nested and Protected Friend")
           End Select

           ' Use the layout mask to test for layout attributes.
           Dim layout As TypeAttributes = attr And TypeAttributes.LayoutMask
           Select Case layout
               Case TypeAttributes.AutoLayout:
                   Console.WriteLine("   ...is AutoLayout")
               Case TypeAttributes.SequentialLayout:
                   Console.WriteLine("   ...is SequentialLayout")
               Case TypeAttributes.ExplicitLayout:
                   Console.WriteLine("   ...is ExplicitLayout")
           End Select

           ' Use the class semantics mask to test for class semantics attributes.
           Dim classSemantics As TypeAttributes = attr And TypeAttributes.ClassSemanticsMask
           Select Case classSemantics
               Case TypeAttributes.Class:
                   If t.IsValueType Then
                       Console.WriteLine("   ...is a value type")
                       Console.WriteLine("   ...is a class")
                   End If
               Case TypeAttributes.Interface:
                   Console.WriteLine("   ...is an interface")
           End Select

           If 0 <> (attr And TypeAttributes.Abstract) Then _
               Console.WriteLine("   ...is MustInherit")

           If 0 <> (attr And TypeAttributes.Sealed) Then _
               Console.WriteLine("   ...is NotInheritable")
    End Sub
End Class
' The example displays the following output:
'       Attributes for type Example:
'          ...is Public
'          ...is AutoLayout
'          ...is a class
'          ...is MustInherit
'       Attributes for type NestedClass:
'          ...is nested and Protected
'          ...is AutoLayout
'          ...is a class
'          ...is NotInheritable
'       Attributes for type INested:
'          ...is nested and Public
'          ...is AutoLayout
'          ...is an interface
'          ...is MustInherit
'       Attributes for type S:
'          ...is not Public
'          ...is SequentialLayout
'          ...is a value type
'          ...is NotInheritable


某些成員TypeAttributes列舉型別會遮罩,代表一組互斥的屬性。Some of the members of the TypeAttributes enumeration are masks that represent a set of mutually exclusive attributes. 比方說,VisibilityMask 成員包含 NotPublic、 公用、 NestedPublic、 NestedPrivate、 NestedFamily、 NestedAssembly、 NestedFamANDAssem 和 NestedFamORAssem 成員,因為每個屬性集包含其基礎值的成員零,您應該先And遮罩與特定的值TypeAttributes.VisibilityMask值,例如擷取自屬性Type.AttributesFor example, the VisibilityMask member includes the NotPublic, Public, NestedPublic, NestedPrivate, NestedFamily, NestedAssembly, NestedFamANDAssem, and NestedFamORAssem members, Because each attribute set includes a member whose underlying value is zero, you should first And the value of the mask with the specific TypeAttributes.VisibilityMask value retrieved from a property such as Type.Attributes. 下表列出遮罩和它們所包含的個別成員:The following table lists the masks and the individual members that they include:

遮罩Mask 包括Includes
VisibilityMaskVisibilityMask NotPublicNotPublic
LayoutMaskLayoutMask AutoLayoutAutoLayout
ClassSemanticsMaskClassSemanticsMask 類別Class
StringFormatMaskStringFormatMask AnsiClassAnsiClass
CustomFormatMaskCustomFormatMask 沒有任何成員。No members.

此列舉值類別的成員在 corhdr.h 檔案中定義符合 CorTypeAttr 列舉值。The members of this enumerator class match the CorTypeAttr enumerator as defined in the corhdr.h file.