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FieldOffsetAttribute Class

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

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

[ComVisibleAttribute(true)] 
[AttributeUsageAttribute(AttributeTargets.Field, Inherited=false)] 
public sealed class FieldOffsetAttribute : Attribute
/** @attribute ComVisibleAttribute(true) */ 
/** @attribute AttributeUsageAttribute(AttributeTargets.Field, Inherited=false) */ 
public final class FieldOffsetAttribute extends Attribute
ComVisibleAttribute(true) 
AttributeUsageAttribute(AttributeTargets.Field, Inherited=false) 
public final class FieldOffsetAttribute extends Attribute

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)] public ulong OemId;
[FieldOffset(4)] public ulong PageSize;
[FieldOffset(16)] public ulong ActiveProcessorMask;
[FieldOffset(20)] public ulong NumberOfProcessors;
[FieldOffset(24)] public ulong ProcessorType;
}

/** @attribute StructLayout(LayoutKind.Explicit)
 */
public class SYSTEM_INFO
{   
    /** @attribute FieldOffset(0)
     */
    public long oemId;
    
    /** @attribute FieldOffset(4)
     */
    public long pageSize;
    
    /** @attribute FieldOffset(16)
     */
    public long activeProcessorMask;
   
    /** @attribute FieldOffset(20)
     */
    public long numberOfProcessors;
    
    /** @attribute FieldOffset(24)
     */
    public long processorType;
   
} //SYSTEM_INFO

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 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0

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