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FieldOffsetAttribute Class

Updated: July 2009

Indicates the physical position of fields within the unmanaged representation of a class or structure.

Namespace:  System.Runtime.InteropServices
Assembly:  mscorlib (in mscorlib.dll)

'Declaration
<ComVisibleAttribute(True)> _
<AttributeUsageAttribute(AttributeTargets.Field, Inherited := False)> _
Public NotInheritable Class FieldOffsetAttribute _
	Inherits Attribute
'Usage
Dim instance As FieldOffsetAttribute

You can apply this attribute to fields.

This attribute is used when System.Runtime.InteropServices.StructLayoutAttribute, with LayoutKind.Explicit passed to its constructor, is applied to a class or structure to specify the offset of each non- static or constant member within the unmanaged representation of that class or structure.

The following example demonstrates how to apply the FieldOffsetAttribute to members of a class with an explicit layout.

<StructLayout(LayoutKind.Explicit)> _
Public Class SYSTEM_INFO
    <FieldOffset(0)> Private OemId As System.UInt64
    <FieldOffset(8)> Private PageSize As System.UInt64
    <FieldOffset(16)> Private ActiveProcessorMask As System.UInt64
    <FieldOffset(24)> Private NumberOfProcessors As System.UInt64
    <FieldOffset(32)> Private ProcessorType As System.UInt64
End Class

For a larger example, see the System.Runtime.InteropServices.StructLayoutAttribute class.

System.Object
  System.Attribute
    System.Runtime.InteropServices.FieldOffsetAttribute

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

Date

History

Reason

July 2009

Removed "managed" from the summary, added a link to an additional sample..

Content bug fix.

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