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DispIdAttribute Class

Specifies the COM dispatch identifier (DISPID) of a method, field, or property.

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

[AttributeUsageAttribute(AttributeTargets.Method|AttributeTargets.Property|AttributeTargets.Field|AttributeTargets.Event, Inherited = false)]
[ComVisibleAttribute(true)]
public sealed class DispIdAttribute : Attribute

You can apply this attribute to methods, fields, or properties.

This attribute contains the DISPID for the method, field, or property it describes. Unique DISPIDs are typically assigned by the common language runtime, but you can use this attribute to assign a specific DISPID to a method. When importing a type library, this attribute is applied to all methods with assigned DISPIDs. This ensures that any managed implementation of the same method retains the same DISPID if exposed to COM.

The following example demonstrates how explicit DISPIDs can be assigned to members of a class.

using System.Runtime.InteropServices;

public class MyClass
{
   public MyClass() {}

   [DispId(8)]
   public void MyMethod() {}

   public int MyOtherMethod() {
      return 0;
   }

   [DispId(9)]
   public bool MyField;
}

System.Object
  System.Attribute
    System.Runtime.InteropServices.DispIdAttribute

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

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, 1.0

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