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AsyncCodeActivity Class
Visual Studio 2010
Manages asynchronous code activity execution from start to completion. This is an abstract class.
System::Object
System.Activities::Activity
System.Activities::AsyncCodeActivity
System.Activities.Statements::InvokeMethod
System.Activities::Activity
System.Activities::AsyncCodeActivity
System.Activities.Statements::InvokeMethod
Assembly: System.Activities (in System.Activities.dll)
The AsyncCodeActivity type exposes the following members.
| 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 nullptr or throws an error when there is an attempt to set the value of this property. (Overrides Activity::Implementation.) |
| Name | Description | |
|---|---|---|
![]() | BeginExecute | 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(CodeActivityMetadata) 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 | 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 | 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 a hash function for a particular type. (Inherited from Object.) |
![]() | GetType | Gets the Type of the current instance. (Inherited from Object.) |
![]() | MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
![]() | 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(); } } }
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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