SequenceActivity Class (System.Workflow.Activities)

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Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:

.NET Framework 3.0

.NET Framework Class Library

SequenceActivity Class

Updated: November 2007

Runs a set of child activities according to a single defined ordering.

Namespace: System.Workflow.Activities
Assembly: System.Workflow.Activities (in System.Workflow.Activities.dll)

Syntax

Visual Basic (Declaration)

<ToolboxBitmapAttribute(GetType(SequenceActivity), "Resources.Sequence.png")> _
Public Class SequenceActivity _
    Inherits CompositeActivity _
    Implements IActivityEventListener(Of ActivityExecutionStatusChangedEventArgs)

Visual Basic (Usage)

Dim instance As SequenceActivity

[ToolboxBitmapAttribute(typeof(SequenceActivity), "Resources.Sequence.png")]
public class SequenceActivity : CompositeActivity, 
    IActivityEventListener<ActivityExecutionStatusChangedEventArgs>

Visual C++

[ToolboxBitmapAttribute(typeof(SequenceActivity), L"Resources.Sequence.png")]
public ref class SequenceActivity : public CompositeActivity, 
    IActivityEventListener<ActivityExecutionStatusChangedEventArgs^>

/** @attribute ToolboxBitmapAttribute(SequenceActivity, "Resources.Sequence.png") */
public class SequenceActivity extends CompositeActivity implements IActivityEventListener<ActivityExecutionStatusChangedEventArgs>

JScript

public class SequenceActivity extends CompositeActivity implements IActivityEventListener<ActivityExecutionStatusChangedEventArgs>

Remarks

The SequenceActivity is a CompositeActivity, meaning the SequenceActivity can contain other activities.

The SequenceActivity class coordinates the running of a set of child activities in an ordered manner, one at a time. The SequenceActivity is completed when the final child activity is finished.

Classes that derive from SequenceActivity should not implement the IActivityEventListener<(Of <(T>)>) interface, or the derived class will not execute correctly.

Examples

The following code example demonstrates how to create a new instance of the SequenceActivity class and add the 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, see Using While and Parallel.

Visual Basic

Me.WhileLoop = New System.Workflow.Activities.WhileActivity()
Me.Parallel = New System.Workflow.Activities.ParallelActivity()
Me.Sequence1 = New System.Workflow.Activities.SequenceActivity()
Me.Sequence2 = New System.Workflow.Activities.SequenceActivity()
Me.ConsoleMessage1 = New System.Workflow.Activities.CodeActivity()
Me.ConsoleMessage2 = New System.Workflow.Activities.CodeActivity()
' 
' WhileLoop
' 
Me.WhileLoop.Activities.Add(Me.Parallel)
AddHandler codecondition1.Condition, AddressOf Me.WhileCondition
Me.WhileLoop.Condition = codecondition1
Me.WhileLoop.Name = "WhileLoop"
' 
' Parallel
' 
Me.Parallel.Activities.Add(Me.Sequence1)
Me.Parallel.Activities.Add(Me.Sequence2)
Me.Parallel.Name = "Parallel"

this.WhileLoop = new System.Workflow.Activities.WhileActivity();
this.Parallel = new System.Workflow.Activities.ParallelActivity();
this.Sequence1 = new System.Workflow.Activities.SequenceActivity();
this.Sequence2 = new System.Workflow.Activities.SequenceActivity();
this.ConsoleMessage1 = new System.Workflow.Activities.CodeActivity();
this.ConsoleMessage2 = new System.Workflow.Activities.CodeActivity();
// 
// WhileLoop
// 
this.WhileLoop.Activities.Add(this.Parallel);
codecondition1.Condition += new System.EventHandler<System.Workflow.Activities.ConditionalEventArgs>(this.WhileCondition);
this.WhileLoop.Condition = codecondition1;
this.WhileLoop.Name = "WhileLoop";
// 
// Parallel
// 
this.Parallel.Activities.Add(this.Sequence1);
this.Parallel.Activities.Add(this.Sequence2);
this.Parallel.Name = "Parallel";

Inheritance Hierarchy

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Platforms

Windows Vista, Windows XP SP2, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Version Information

.NET Framework

Supported in: 3.5, 3.0

Reference

SequenceActivity Members

System.Workflow.Activities Namespace

Other Resources

Using the Sequence Activity

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