TypeAttributes Enumeración

Definición

public enum class TypeAttributes

[System.Flags]
public enum TypeAttributes

[System.Flags]
[System.Serializable]
public enum TypeAttributes

[System.Flags]
[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public enum TypeAttributes

[<System.Flags>]
type TypeAttributes = 

[<System.Flags>]
[<System.Serializable>]
type TypeAttributes = 

[<System.Flags>]
[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type TypeAttributes = 

Public Enum TypeAttributes

Herencia

Object

ValueType

Enum

TypeAttributes

Atributos

FlagsAttribute SerializableAttribute ComVisibleAttribute

Campos

Ejemplos

En el ejemplo siguiente se recupera el valor de la Attributes propiedad para Type los objetos que representan una serie de tipos diferentes y, a continuación, se determina si se han establecido marcas de atributo individuales.

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");
                   break;
               case TypeAttributes.Public:
                   Console.WriteLine("   ...is public");
                   break;
               case TypeAttributes.NestedPublic:
                   Console.WriteLine("   ...is nested and public");
                   break;
               case TypeAttributes.NestedPrivate:
                   Console.WriteLine("   ...is nested and private");
                   break;
               case TypeAttributes.NestedFamANDAssem:
                   Console.WriteLine("   ...is nested, and inheritable only within the assembly" +
                      "\n         (cannot be declared in C#)");
                   break;
               case TypeAttributes.NestedAssembly:
                   Console.WriteLine("   ...is nested and internal");
                   break;
               case TypeAttributes.NestedFamily:
                   Console.WriteLine("   ...is nested and protected");
                   break;
               case TypeAttributes.NestedFamORAssem:
                   Console.WriteLine("   ...is nested and protected internal");
                   break;
           }

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

           // 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");
                   }
                   else
                   {
                       Console.WriteLine("   ...is a class");
                   }
                   break;
               case TypeAttributes.Interface:
                   Console.WriteLine("   ...is an interface");
                   break;
           }

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

           if ((attr & TypeAttributes.Sealed) != 0)
           {
               Console.WriteLine("   ...is sealed");
           }
           
           Console.WriteLine();
       }
    }
}
// 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")
                   Else
                       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")
           Console.WriteLine()
       Next
    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

Comentarios

Algunos de los miembros de la TypeAttributes enumeración son máscaras que representan un conjunto de atributos mutuamente excluyentes. Por ejemplo, el VisibilityMask miembro incluye los NotPublicmiembros , Public, NestedPrivate``NestedPublic``NestedAssembly``NestedFamily, NestedFamANDAssemy .NestedFamORAssem Dado que cada conjunto de atributos incluye un miembro cuyo valor subyacente es cero, primero And debe tener el valor de la máscara con el valor específico System.Reflection.TypeAttributes recuperado de una propiedad como Type.Attributes. En la tabla siguiente se enumeran las máscaras y los miembros individuales que incluyen:

Los miembros de esta clase de enumerador coinciden con el enumerador CorTypeAttr tal y como se define en el archivo corhdr.h.

Se aplica a