ExternalDataExchangeAttribute Class

Definition

Namespace:

System.Workflow.Activities

Assembly:

System.Workflow.Activities.dll

Caution

The System.Workflow.* types are deprecated. Instead, please use the new types from System.Activities.*

Marks an interface as a local service interface. This class cannot be inherited.

public ref class ExternalDataExchangeAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Interface, AllowMultiple=false, Inherited=false)]
[System.Obsolete("The System.Workflow.* types are deprecated.  Instead, please use the new types from System.Activities.*")]
public sealed class ExternalDataExchangeAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Interface, AllowMultiple=false, Inherited=false)>]
[<System.Obsolete("The System.Workflow.* types are deprecated.  Instead, please use the new types from System.Activities.*")>]
type ExternalDataExchangeAttribute = class
    inherit Attribute

Public NotInheritable Class ExternalDataExchangeAttribute
Inherits Attribute

Inheritance

Object

Attribute

ExternalDataExchangeAttribute

Attributes

AttributeUsageAttribute ObsoleteAttribute

Examples

The following code example shows how to set the ExternalDataExchangeAttribute on an interface. This code example is part of the ActiveDirectoryRoles SDK sample from the IStartPurchaseOrder.cs file. For more information, see Using Active Directory Roles.

[ExternalDataExchangeAttribute()]
public interface IStartPurchaseOrder
{
    event EventHandler<InitiatePOEventArgs> InitiatePurchaseOrder;
}

Remarks

Warning

This material discusses types and namespaces that are obsolete. For more information, see Deprecated Types in Windows Workflow Foundation 4.5.

A class that implements a local service interface must be added to the ExternalDataExchangeService and can be used by CallExternalMethodActivity and HandleExternalEventActivity.

Events on interfaces that are attributed with ExternalDataExchangeAttribute should have event data that derive from ExternalDataEventArgs.

While generic types are supported for interface method and event declarations, generic types are not supported for the interface declaration itself. The following interface would not be valid for use as an ExternalDataExchange.

public interface IInterfaceName<TCommand>  
{   
    void MethodName(TCommand Request);  
}  

Constructors

ExternalDataExchangeAttribute()

Initializes a new instance of the ExternalDataExchangeAttribute.

Properties

TypeId

When implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute)

Methods

Equals(Object)	Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute)
GetHashCode()	Returns the hash code for this instance. (Inherited from Attribute)
GetType()	Gets the Type of the current instance. (Inherited from Object)
IsDefaultAttribute()	When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute)
Match(Object)	When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
ToString()	Returns a string that represents the current object. (Inherited from Object)

Explicit Interface Implementations

_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)	Maps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute)
_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)	Retrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute)
_Attribute.GetTypeInfoCount(UInt32)	Retrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute)
_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)	Provides access to properties and methods exposed by an object. (Inherited from Attribute)