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TypeAttributes Enumeration

Specifies type attributes.

This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.

Namespace:  System.Reflection
Assembly:  mscorlib (in mscorlib.dll)

[FlagsAttribute]
[ComVisibleAttribute(true)]
public enum TypeAttributes

Member nameDescription
Supported by Silverlight for Windows PhoneSupported by Xbox 360VisibilityMaskSpecifies type visibility information.
Supported by Silverlight for Windows PhoneSupported by Xbox 360NotPublicSpecifies that the class is not public.
Supported by Silverlight for Windows PhoneSupported by Xbox 360PublicSpecifies that the class is public.
Supported by Silverlight for Windows PhoneSupported by Xbox 360NestedPublicSpecifies that the class is nested with public visibility.
Supported by Silverlight for Windows PhoneSupported by Xbox 360NestedPrivateSpecifies that the class is nested with private visibility.
Supported by Silverlight for Windows PhoneSupported by Xbox 360NestedFamilySpecifies that the class is nested with family visibility, and is thus accessible only by methods within its own type and any subtypes.
Supported by Silverlight for Windows PhoneSupported by Xbox 360NestedAssemblySpecifies that the class is nested with assembly visibility, and is thus accessible only by methods within its assembly.
Supported by Silverlight for Windows PhoneSupported by Xbox 360NestedFamANDAssemSpecifies 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.
Supported by Silverlight for Windows PhoneSupported by Xbox 360NestedFamORAssemSpecifies 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.
Supported by Silverlight for Windows PhoneSupported by Xbox 360LayoutMaskSpecifies class layout information.
Supported by Silverlight for Windows PhoneSupported by Xbox 360AutoLayoutSpecifies that class fields are automatically laid out by the common language runtime.
Supported by Silverlight for Windows PhoneSupported by Xbox 360SequentialLayoutSpecifies that class fields are laid out sequentially, in the order that the fields were emitted to the metadata.
Supported by Silverlight for Windows PhoneSupported by Xbox 360ExplicitLayoutSpecifies that class fields are laid out at the specified offsets.
Supported by Silverlight for Windows PhoneSupported by Xbox 360ClassSemanticsMaskSpecifies class semantics information; the current class is contextful (else agile).
Supported by Silverlight for Windows PhoneSupported by Xbox 360ClassSpecifies that the type is a class.
Supported by Silverlight for Windows PhoneSupported by Xbox 360InterfaceSpecifies that the type is an interface.
Supported by Silverlight for Windows PhoneSupported by Xbox 360AbstractSpecifies that the type is abstract.
Supported by Silverlight for Windows PhoneSupported by Xbox 360SealedSpecifies that the class is concrete and cannot be extended.
Supported by Silverlight for Windows PhoneSupported by Xbox 360SpecialNameSpecifies that the class is special in a way denoted by the name.
Supported by Silverlight for Windows PhoneSupported by Xbox 360ImportSpecifies that the class or interface is imported from another module.
Supported by Silverlight for Windows PhoneSupported by Xbox 360SerializableSpecifies that the class can be serialized.
Supported by Silverlight for Windows PhoneSupported by Xbox 360StringFormatMaskUsed to retrieve string information for native interoperability.
Supported by Silverlight for Windows PhoneSupported by Xbox 360AnsiClassLPTSTR is interpreted as ANSI.
Supported by Silverlight for Windows PhoneSupported by Xbox 360UnicodeClassLPTSTR is interpreted as UNICODE.
Supported by Silverlight for Windows PhoneSupported by Xbox 360AutoClassLPTSTR is interpreted automatically.
CustomFormatClassLPSTR is interpreted by some implementation-specific means, which includes the possibility of throwing a NotSupportedException. Not used in the Microsoft implementation of the .NET Framework.
CustomFormatMaskUsed to retrieve non-standard encoding information for native interop. The meaning of the values of these 2 bits is unspecified. Not used in the Microsoft implementation of the .NET Framework.
Supported by Silverlight for Windows PhoneSupported by Xbox 360BeforeFieldInitSpecifies that calling static methods of the type does not force the system to initialize the type.
Supported by Silverlight for Windows PhoneSupported by Xbox 360ReservedMaskAttributes reserved for runtime use.
Supported by Silverlight for Windows PhoneSupported by Xbox 360RTSpecialNameRuntime should check name encoding.
Supported by Silverlight for Windows PhoneSupported by Xbox 360HasSecurityType has security associate with it.

The members of this enumerator class match the CorTypeAttr enumerator as defined in the corhdr.h file.

The following example shows the use of type attributes. The fact that there is a member in each of several groupings that has the value zero means that you must use masks before testing for those members.

For most purposes, properties like Type.IsClass, Type.IsAutoLayout, and Type.IsSpecialName are easier to use than type attributes.


using System;
using System.Reflection;

internal struct S
{
    public int X;
}

public abstract class Example
{
    protected sealed class NestedClass {}

    public interface INested {}

    private static System.Windows.Controls.TextBlock outputBlock;

    public static void Demo(System.Windows.Controls.TextBlock outputBlock)
    {
        Example.outputBlock = outputBlock;

        DisplayAttributes(typeof(Example));
        DisplayAttributes(typeof(NestedClass));
        DisplayAttributes(typeof(INested));
        DisplayAttributes(typeof(S));
    }

    private static void DisplayAttributes(Type t)
    {
        outputBlock.Text += "Attributes for type "+t.Name+":\n";

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

        TypeAttributes layout = attr & TypeAttributes.LayoutMask;
        switch (layout)
        {
            case TypeAttributes.AutoLayout:
                outputBlock.Text += "   ...is AutoLayout\n";
                break;
            case TypeAttributes.SequentialLayout:
                outputBlock.Text += "   ...is SequentialLayout\n";
                break;
            case TypeAttributes.ExplicitLayout:
                outputBlock.Text += "   ...is ExplicitLayout\n";
                break;
        }

        TypeAttributes classSemantics = attr & TypeAttributes.ClassSemanticsMask;
        switch (classSemantics)
        {
            case TypeAttributes.Class:
                if (t.IsValueType)
                {
                    outputBlock.Text += "   ...is a value type\n";
                }
                else
                {
                    outputBlock.Text += "   ...is a class\n";
                }
                break;
            case TypeAttributes.Interface:
                outputBlock.Text += "   ...is an interface\n";
                break;
        }

        if (0!=(attr & TypeAttributes.Abstract)) 
        {
            outputBlock.Text += "   ...is abstract\n";
        }

        if (0!=(attr & TypeAttributes.Sealed)) 
        {
            outputBlock.Text += "   ...is sealed\n";
        }
    }
}

/* This example produces 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
 */


Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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