An activity that executes all child activities simultaneously and asynchronously.
System.Activities.Activity
System.Activities.NativeActivity
System.Activities.Statements.Parallel
Namespace: System.Activities.Statements
Assembly: System.Activities (in System.Activities.dll)
<ContentPropertyAttribute("Branches")> _ Public NotInheritable Class Parallel _ Inherits NativeActivity
[ContentPropertyAttribute("Branches")] public sealed class Parallel : NativeActivity
[ContentPropertyAttribute(L"Branches")] public ref class Parallel sealed : public NativeActivity
[<Sealed>] [<ContentPropertyAttribute("Branches")>] type Parallel = class inherit NativeActivity end
The Parallel type exposes the following members.
| Name | Description | |
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Parallel | Creates a new instance of the Parallel activity. |
| Name | Description | |
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Branches | The child elements to be executed in parallel. |
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CacheId | Gets the identifier of the cache that is unique within the scope of the workflow definition. (Inherited from Activity.) |
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CanInduceIdle | Gets or sets a value that indicates whether the activity can cause the workflow to become idle. (Inherited from NativeActivity.) |
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CompletionCondition | Evaluates after any branch completes. |
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Constraints | Gets a collection of Constraint activities that can be configured to provide validation for the Activity. (Inherited from Activity.) |
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DisplayName | Gets or sets an optional friendly name that is used for debugging, validation, exception handling, and tracking. (Inherited from Activity.) |
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Id | Gets an identifier that is unique in the scope of the workflow definition. (Inherited from Activity.) |
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Implementation | The execution logic of the activity. (Inherited from NativeActivity.) |
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Variables | The collection of contained variables. |
| Name | Description | |
|---|---|---|
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Abort | When implemented in a derived class, takes actions in response to the activity being aborted. (Inherited from NativeActivity.) |
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CacheMetadata(ActivityMetadata) | Not implemented. Use the CacheMetadata(NativeActivityMetadata) method instead. (Inherited from NativeActivity.) |
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CacheMetadata(NativeActivityMetadata) | Creates and validates a description of the activity’s arguments, variables, child activities, and activity delegates. (Inherited from NativeActivity.) |
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Cancel | When implemented in a derived class, runs logic to cause graceful early completion of the activity. (Inherited from NativeActivity.) |
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Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
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Execute | When implemented in a derived class, runs the activity’s execution logic. (Inherited from NativeActivity.) |
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Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
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GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
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GetType | Gets the Type of the current instance. (Inherited from Object.) |
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MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
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ShouldSerializeDisplayName | Indicates whether the DisplayName property should be serialized. (Inherited from Activity.) |
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ToString | Returns a String that contains the Id and DisplayName of the Activity. (Inherited from Activity.) |
A Parallel activity operates by simultaneously scheduling each Activity in its Branches collection at the start. It completes when all of its Branches complete or when its CompletionCondition property evaluates to true. While all the Activity objects run asynchronously, they do not execute on separate threads, so each successive activity only executes when the previously scheduled activity completes or goes idle. If none of the child activities of this activity go idle, this activity execute in the same way that a Sequence activity does.
The following code sample demonstrates creating a Parallel activity. This example is from the Cancellation Handler on Compensable Activity sample.
return new Parallel { // Timeout from branch causes other branch to cancel. CompletionCondition = true, Branches = { // Delay Branch new Sequence { Activities = { new WriteLine { Text = "Branch1: Body is about to Delay 2secs transferring execution to Branch2" }, new Delay { Duration = TimeSpan.FromSeconds(2) }, new WriteLine { Text = "Branch1: Body is about to complete causing Branch2 to cancel.." }, } },
.NET Framework
Supported in: 4.NET Framework Client Profile
Supported in: 4Windows 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.