ParallelActivity Class
Runs a set of child activities at the same time. This class cannot be inherited.
Assembly: System.Workflow.Activities (in System.Workflow.Activities.dll)
System.Workflow.ComponentModel::DependencyObject
System.Workflow.ComponentModel::Activity
System.Workflow.ComponentModel::CompositeActivity
System.Workflow.Activities::ParallelActivity
[ToolboxBitmapAttribute((ParallelActivity^::typeid), "Resources.Parallel.png")] [WorkflowDebuggerSteppingAttribute(WorkflowDebuggerSteppingOption::Concurrent)] [ObsoleteAttribute("The System.Workflow.* types are deprecated. Instead, please use the new types from System.Activities.*")] public ref class ParallelActivity sealed : CompositeActivity, IActivityEventListener<ActivityExecutionStatusChangedEventArgs^>
| Name | Description | |
|---|---|---|
![]() | ParallelActivity() | Initializes a new instance of the ParallelActivity class. |
![]() | ParallelActivity(String^) | Initializes a new instance of the ParallelActivity class using the name of the activity. |
| Name | Description | |
|---|---|---|
![]() | Activities | Gets the object representing the collection, ActivityCollection, of all child activities.(Inherited from CompositeActivity.) |
![]() | CanModifyActivities | Gets or sets a value which controls whether the individual activities within Activities can be modified.(Inherited from CompositeActivity.) |
![]() | Description | |
![]() | DesignMode | Gets the value that indicates whether this instance is in design or run-time mode.(Inherited from DependencyObject.) |
![]() | Enabled | Gets or sets a value that indicates whether this instance is enabled for execution and validation.(Inherited from Activity.) |
![]() | EnabledActivities | Gets the read-only collection that represents the subset of Activities that are enabled. (Inherited from CompositeActivity.) |
![]() | ExecutionResult | Gets the ActivityExecutionResult of the last attempt to run this instance.(Inherited from Activity.) |
![]() | ExecutionStatus | Gets the current ActivityExecutionStatus of this instance.(Inherited from Activity.) |
![]() | IsDynamicActivity | Gets information about whether the activity is executing within the default ActivityExecutionContext of the workflow instance.(Inherited from Activity.) |
![]() | Name | Gets or sets the name of this instance. This name must conform to the variable naming convention of the programming language that is being used in the Workflow project.(Inherited from Activity.) |
![]() | Parent | Gets the CompositeActivity that contains this Activity.(Inherited from Activity.) |
![]() | QualifiedName | Gets the qualified name of the activity. Qualified activity names are always unique in a workflow instance.(Inherited from Activity.) |
![]() | Site | Gets or sets a reference to the Site component of the DependencyObject.(Inherited from DependencyObject.) |
![]() | UserData | Gets an IDictionary that associates custom data with this class instance.(Inherited from DependencyObject.) |
| Name | Description | |
|---|---|---|
![]() | Canceling | Occurs when the activity execution is canceled. (Inherited from Activity.) |
![]() | Closed | |
![]() | Compensating | |
![]() | Executing | |
![]() | Faulting | Occurs when an exception is raised during the running of the instance.(Inherited from Activity.) |
![]() | StatusChanged | Occurs when the ActivityExecutionStatus of a running Activity changes.(Inherited from Activity.) |
| Name | Description | |
|---|---|---|
![]() ![]() | IComponent::Disposed | Represents the method that handles the Disposed event of a component.(Inherited from DependencyObject.) |
![]() ![]() | IActivityEventListener<ActivityExecutionStatusChangedEventArgs^>::OnEvent(Object^, ActivityExecutionStatusChangedEventArgs^) | Defines the processing procedure when the subscribed-to event occurs. |
Note |
|---|
This material discusses types and namespaces that are obsolete. For more information, see Deprecated Types in Windows Workflow Foundation 4.5. |
The order in which child activities are run is non-deterministic.
The ParallelActivity is a CompositeActivity, which means the ParallelActivity can contain other activities. The SequenceActivity activity is the only activity that can be the child of a ParallelActivity.
Only one activity can run at a time.
The ParallelActivity only finishes when all children are complete.
The ParallelActivity is especially useful when there are one or more blocking activities, such as the DelayActivity activity, in one or more of the branches. In this scenario, the ParallelActivity actually switches to a different branch when the DelayActivity is blocked. If there are no blocking activities in any one of the ParallelActivity branches then the activity uses a non-deterministic sequence.
The following code example shows how to create a new instance of the ParallelActivity class, add the ParallelActivity class to the WhileActivity class, and add two SequenceActivity classes to the ParallelActivity class. This code example is part of the WhileAndParallel SDK sample from the WhileAndParallelWorkflow.Designer.cs file. For more information, seeUsing While and Parallel.
Available since 3.0
Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
System.Workflow.Activities Namespace
Using the Parallel Activity








