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NativeActivity Class
Visual Studio 2010
Abstract base class for custom activities that implement execution logic using the Execute(ActivityExecutionContext) method, which has full access to the runtime’s features.
Assembly: System.Activities (in System.Activities.dll)
The NativeActivity type exposes the following members.
| Name | Description | |
|---|---|---|
![]() | NativeActivity | When implemented in a derived class, creates a new instance of the derived class. |
| Name | Description | |
|---|---|---|
![]() | CacheId | Gets the identifier of the cache that is unique within the scope of the workflow definition. (Inherited from Activity.) |
![]() | CanInduceIdle | Gets or sets a value that indicates whether the activity can cause the workflow to become idle. |
![]() | 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 | The execution logic of the activity. (Overrides Activity::Implementation.) |
| Name | Description | |
|---|---|---|
![]() | Abort | When implemented in a derived class, takes actions in response to the activity being aborted. |
![]() | CacheMetadata(ActivityMetadata) | Not implemented. Use the CacheMetadata(NativeActivityMetadata) method instead. (Overrides Activity::CacheMetadata(ActivityMetadata).) |
![]() | CacheMetadata(NativeActivityMetadata) | Creates and validates a description of the activity’s arguments, variables, child activities, and activity delegates. |
![]() | Cancel | When implemented in a derived class, runs logic to cause graceful early completion of the activity. |
![]() | Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
![]() | Execute | When implemented in a derived class, runs the activity’s execution logic. |
![]() | 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 code sample demonstrates creating a class that inherits from NativeActivity<TResult>. This example is from the Custom Composite using Native Activity sample.
public sealed class MySequence : NativeActivity
{
Collection<Activity> children;
Collection<Variable> variables;
Variable<int> currentIndex;
CompletionCallback onChildComplete;
public MySequence()
: base()
{
this.children = new Collection<Activity>();
this.variables = new Collection<Variable>();
this.currentIndex = new Variable<int>();
}
public Collection<Activity> Activities
{
get
{
return this.children;
}
}
public Collection<Variable> Variables
{
get
{
return this.variables;
}
}
protected override void CacheMetadata(NativeActivityMetadata metadata)
{
//call base.CacheMetadata to add the Activities and Variables to this activity's metadata
base.CacheMetadata(metadata);
//add the private implementation variable: currentIndex
metadata.AddImplementationVariable(this.currentIndex);
}
protected override void Execute(NativeActivityContext context)
{
InternalExecute(context, null);
}
void InternalExecute(NativeActivityContext context, ActivityInstance instance)
{
//grab the index of the current Activity
int currentActivityIndex = this.currentIndex.Get(context);
if (currentActivityIndex == Activities.Count)
{
//if the currentActivityIndex is equal to the count of MySequence's Activities
//MySequence is complete
return;
}
if (this.onChildComplete == null)
{
//on completion of the current child, have the runtime call back on this method
this.onChildComplete = new CompletionCallback(InternalExecute);
}
//grab the next Activity in MySequence.Activities and schedule it
Activity nextChild = Activities[currentActivityIndex];
context.ScheduleActivity(nextChild, this.onChildComplete);
//increment the currentIndex
this.currentIndex.Set(context, ++currentActivityIndex);
}
}
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.
System::Object
System.Activities::Activity
System.Activities::NativeActivity
System.Activities.Statements::CancellationScope
System.Activities.Statements::Compensate
System.Activities.Statements::Confirm
System.Activities.Statements::Delay
System.Activities.Statements::DeleteBookmarkScope
System.Activities.Statements::DoWhile
System.Activities.Statements::Flowchart
System.Activities.Statements::ForEach<T>
System.Activities.Statements::HandleScope<THandle>
System.Activities.Statements::If
System.Activities.Statements::Interop
System.Activities.Statements::InvokeAction
System.Activities.Statements::InvokeAction<T>
System.Activities.Statements::InvokeAction<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10>
System.Activities.Statements::InvokeAction<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11>
System.Activities.Statements::InvokeAction<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12>
System.Activities.Statements::InvokeAction<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13>
System.Activities.Statements::InvokeAction<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14>
System.Activities.Statements::InvokeAction<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15>
System.Activities.Statements::InvokeAction<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16>
System.Activities.Statements::InvokeAction<T1, T2>
System.Activities.Statements::InvokeAction<T1, T2, T3>
System.Activities.Statements::InvokeAction<T1, T2, T3, T4>
System.Activities.Statements::InvokeAction<T1, T2, T3, T4, T5>
System.Activities.Statements::InvokeAction<T1, T2, T3, T4, T5, T6>
System.Activities.Statements::InvokeAction<T1, T2, T3, T4, T5, T6, T7>
System.Activities.Statements::InvokeAction<T1, T2, T3, T4, T5, T6, T7, T8>
System.Activities.Statements::InvokeAction<T1, T2, T3, T4, T5, T6, T7, T8, T9>
System.Activities.Statements::InvokeDelegate
System.Activities.Statements::Parallel
System.Activities.Statements::ParallelForEach<T>
System.Activities.Statements::Persist
System.Activities.Statements::Pick
System.Activities.Statements::Rethrow
System.Activities.Statements::Sequence
System.Activities.Statements::StateMachine
System.Activities.Statements::Switch<T>
System.Activities.Statements::TerminateWorkflow
System.Activities.Statements::TransactionScope
System.Activities.Statements::TryCatch
System.Activities.Statements::While
System.Activities.Validation::AddValidationError
System.Activities.Validation::AssertValidation
System.Activities.Validation::Constraint
System.ServiceModel.Activities::CorrelationScope
System.ServiceModel.Activities::InitializeCorrelation
System.ServiceModel.Activities::TransactedReceiveScope
System.Activities::Activity
System.Activities::NativeActivity
System.Activities.Statements::CancellationScope
System.Activities.Statements::Compensate
System.Activities.Statements::Confirm
System.Activities.Statements::Delay
System.Activities.Statements::DeleteBookmarkScope
System.Activities.Statements::DoWhile
System.Activities.Statements::Flowchart
System.Activities.Statements::ForEach<T>
System.Activities.Statements::HandleScope<THandle>
System.Activities.Statements::If
System.Activities.Statements::Interop
System.Activities.Statements::InvokeAction
System.Activities.Statements::InvokeAction<T>
System.Activities.Statements::InvokeAction<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10>
System.Activities.Statements::InvokeAction<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11>
System.Activities.Statements::InvokeAction<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12>
System.Activities.Statements::InvokeAction<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13>
System.Activities.Statements::InvokeAction<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14>
System.Activities.Statements::InvokeAction<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15>
System.Activities.Statements::InvokeAction<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16>
System.Activities.Statements::InvokeAction<T1, T2>
System.Activities.Statements::InvokeAction<T1, T2, T3>
System.Activities.Statements::InvokeAction<T1, T2, T3, T4>
System.Activities.Statements::InvokeAction<T1, T2, T3, T4, T5>
System.Activities.Statements::InvokeAction<T1, T2, T3, T4, T5, T6>
System.Activities.Statements::InvokeAction<T1, T2, T3, T4, T5, T6, T7>
System.Activities.Statements::InvokeAction<T1, T2, T3, T4, T5, T6, T7, T8>
System.Activities.Statements::InvokeAction<T1, T2, T3, T4, T5, T6, T7, T8, T9>
System.Activities.Statements::InvokeDelegate
System.Activities.Statements::Parallel
System.Activities.Statements::ParallelForEach<T>
System.Activities.Statements::Persist
System.Activities.Statements::Pick
System.Activities.Statements::Rethrow
System.Activities.Statements::Sequence
System.Activities.Statements::StateMachine
System.Activities.Statements::Switch<T>
System.Activities.Statements::TerminateWorkflow
System.Activities.Statements::TransactionScope
System.Activities.Statements::TryCatch
System.Activities.Statements::While
System.Activities.Validation::AddValidationError
System.Activities.Validation::AssertValidation
System.Activities.Validation::Constraint
System.ServiceModel.Activities::CorrelationScope
System.ServiceModel.Activities::InitializeCorrelation
System.ServiceModel.Activities::TransactedReceiveScope
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