AsyncCodeActivity Class
Manages asynchronous code activity execution from start to completion. This is an abstract class.
Assembly: System.Activities (in System.Activities.dll)
System.Activities::Activity
System.Activities::AsyncCodeActivity
System.Activities.Statements::InvokeMethod
| Name | Description | |
|---|---|---|
![]() | AsyncCodeActivity() | Creates a new instance of the AsyncCodeActivity class. |
| Name | Description | |
|---|---|---|
![]() | CacheId | Gets the identifier of the cache that is unique within the scope of the workflow definition.(Inherited from Activity.) |
![]() | Constraints | Gets a collection of Constraint activities that can be configured to provide validation for the Activity.(Inherited from Activity.) |
![]() | DisplayName | Gets or sets an optional friendly name that is used for debugging, validation, exception handling, and tracking.(Inherited from Activity.) |
![]() | Id | Gets an identifier that is unique in the scope of the workflow definition.(Inherited from Activity.) |
![]() | Implementation | Gets null or throws an error when there is an attempt to set the value of this property.(Overrides Activity::Implementation.) |
![]() | ImplementationVersion | Gets or sets the implementation version of the activity.(Overrides Activity::ImplementationVersion.) |
| Name | Description | |
|---|---|---|
![]() | BeginExecute(AsyncCodeActivityContext^, AsyncCallback^, Object^) | When implemented in a derived class and using the specified execution context, callback method, and user state, enqueues an asynchronous activity in a run-time workflow. |
![]() | CacheMetadata(ActivityMetadata) | Not implemented. Use CacheMetadata instead.(Overrides Activity::CacheMetadata(ActivityMetadata).) |
![]() | CacheMetadata(CodeActivityMetadata) | Serves as a virtual method and converts information obtained by cache reflection into arguments for an asynchronous activity. |
![]() | Cancel(AsyncCodeActivityContext^) | When implemented in a derived class and using the specified execution environment information, notifies the workflow runtime that the asynchronous activity operation has reached an early completion. Serves as a virtual method. |
![]() | EndExecute(AsyncCodeActivityContext^, IAsyncResult^) | When implemented in a derived class and using the specified execution environment information, notifies the workflow runtime that the associated asynchronous activity operation has completed. |
![]() | Equals(Object^) | Determines whether the specified object is equal to the current object.(Inherited from Object.) |
![]() | Finalize() | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.) |
![]() | GetHashCode() | Serves as the default hash function. (Inherited from Object.) |
![]() | GetType() | |
![]() | MemberwiseClone() | |
![]() | OnCreateDynamicUpdateMap(UpdateMapMetadata^, Activity^) | Raises an event when creating a map for the dynamic update.(Overrides Activity::OnCreateDynamicUpdateMap(UpdateMapMetadata^, Activity^).) |
![]() | ShouldSerializeDisplayName() | Indicates whether the DisplayName property should be serialized.(Inherited from Activity.) |
![]() | ToString() | Returns a String that contains the Id and DisplayName of the Activity.(Inherited from Activity.) |
The following example shows how to derive a class from AsyncCodeActivity to create a custom activity.
public sealed class FileWriter : AsyncCodeActivity { public FileWriter() : base() { } protected override IAsyncResult BeginExecute(AsyncCodeActivityContext context, AsyncCallback callback, object state) { string tempFileName = Path.GetTempFileName(); Console.WriteLine("Writing to file: " + tempFileName); FileStream file = File.Open(tempFileName, FileMode.Create); context.UserState = file; byte[] bytes = UnicodeEncoding.Unicode.GetBytes("123456789"); return file.BeginWrite(bytes, 0, bytes.Length, callback, state); } protected override void EndExecute(AsyncCodeActivityContext context, IAsyncResult result) { FileStream file = (FileStream)context.UserState; try { file.EndWrite(result); file.Flush(); } finally { file.Close(); } } }
Available since 4.0
Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.



