AsyncCodeActivity Class
Definition
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Manages asynchronous code activity execution from start to completion. This is an abstract class.
public ref class AsyncCodeActivity abstract : System::Activities::Activity
public abstract class AsyncCodeActivity : System.Activities.Activity
type AsyncCodeActivity = class
inherit Activity
Public MustInherit Class AsyncCodeActivity
Inherits Activity
- Inheritance
- Derived
Examples
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();
}
}
}
Constructors
AsyncCodeActivity() |
Creates a new instance of the AsyncCodeActivity class. |
Properties
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 |
ImplementationVersion |
Gets or sets the implementation version of the activity. |
ImplementationVersion |
Gets or sets the version of the implementation used. (Inherited from Activity) |
Methods
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(CodeActivityMetadata) instead. |
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) |
GetHashCode() |
Serves as the default hash function. (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) |
OnCreateDynamicUpdateMap(UpdateMapMetadata, Activity) |
Raises an event when creating a map for the dynamic update. |
OnCreateDynamicUpdateMap(UpdateMapMetadata, Activity) |
Raises an event when creating dynamic update map. (Inherited from 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) |