FieldAttributes Enumeration
Specifies flags that describe the attributes of a field.
This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.
Namespace: System.ReflectionAssembly: mscorlib (in mscorlib.dll)
| Member name | Description | |
|---|---|---|
![]() ![]() | FieldAccessMask | Specifies the access level of a given field. |
![]() ![]() | PrivateScope | Specifies that the field cannot be referenced. |
![]() ![]() | Private | Specifies that the field is accessible only by the parent type. |
![]() ![]() | FamANDAssem | Specifies that the field is accessible only by subtypes in this assembly. |
![]() ![]() | Assembly | Specifies that the field is accessible throughout the assembly. |
![]() ![]() | Family | Specifies that the field is accessible only by type and subtypes. |
![]() ![]() | FamORAssem | Specifies that the field is accessible by subtypes anywhere, as well as throughout this assembly. |
![]() ![]() | Public | Specifies that the field is accessible by any member for whom this scope is visible. |
![]() ![]() | Static | Specifies that the field represents the defined type, or else it is per-instance. |
![]() ![]() | InitOnly | Specifies that the field is initialized only, and can be set only in the body of a constructor. |
![]() ![]() | Literal | Specifies that the field's value is a compile-time (static or early bound) constant. Any attempt to set it throws FieldAccessException. |
![]() ![]() | NotSerialized | Specifies that the field does not have to be serialized when the type is remoted. |
![]() ![]() | SpecialName | Specifies a special method, with the name describing how the method is special. |
![]() ![]() | PinvokeImpl | Reserved for future use. |
![]() ![]() | ReservedMask | Reserved. |
![]() ![]() | RTSpecialName | Specifies that the common language runtime (metadata internal APIs) should check the name encoding. |
![]() ![]() | HasFieldMarshal | Specifies that the field has marshaling information. |
![]() ![]() | HasDefault | Specifies that the field has a default value. |
![]() ![]() | HasFieldRVA | Specifies that the field has a relative virtual address (RVA). The RVA is the location of the method body in the current image, as an address relative to the start of the image file in which it is located. |
FieldAttributes uses the value from FieldAccessMask to mask off only the parts of the attribute value that pertain to the accessibility. For example, the following code determines if Attributes has the public bit set:
To get the FieldAttributes, first get the class Type. From the Type, get the FieldInfo. From the FieldInfo, get the Attributes.
The enumerated value is a number representing the bitwise OR of the attributes implemented on the field.
In this example, three fields are built and the FieldAttributes values are displayed. A FieldAttributes value can contain more than one attribute, for example, both Public and Literal, as shown in the third field.
Imports System Imports System.Reflection Imports Microsoft.VisualBasic Public Class Demo ' Declare three fields. ' The first field is private. Private m_field As String = "String A" 'The second field is public. Public Field As String = "String B" ' The third field is public and const, hence also static ' and literal with a default value. Public Const FieldC As String = "String C" End Class Module Module1 Sub Main() ' Create an instance of the Demo class. Dim d As New Demo() Console.WriteLine(vbCrLf & "Reflection.FieldAttributes") ' Get a Type object for Demo, and a FieldInfo for each of ' the three fields. Use the FieldInfo to display field ' name, value for the Demo object in d, and attributes. ' Dim myType As Type = GetType(Demo) Dim fiPrivate As FieldInfo = myType.GetField("m_field", _ BindingFlags.NonPublic Or BindingFlags.Instance) DisplayField(d, fiPrivate) Dim fiPublic As FieldInfo = myType.GetField("Field", _ BindingFlags.Public Or BindingFlags.Instance) DisplayField(d, fiPublic) Dim fiConstant As FieldInfo = myType.GetField("FieldC", _ BindingFlags.Public Or BindingFlags.Static) DisplayField(d, fiConstant) End Sub Sub DisplayField(ByVal obj As Object, ByVal f As FieldInfo) ' Display the field name, value, and attributes. ' Console.WriteLine("{0} = ""{1}""; attributes: {2}", _ f.Name, f.GetValue(obj), f.Attributes) End Sub End Module ' This code example produces the following output: ' 'm_field = "String A"; attributes: Private 'Field = "String B"; attributes: Public 'FieldC = "String C"; attributes: Public, Static, Literal, HasDefault
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
