Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WF / Activities / Sequence.cs / 1305376 / Sequence.cs
namespace System.Workflow.Activities { #region Imports using System; using System.Text; using System.Reflection; using System.Collections; using System.CodeDom; using System.ComponentModel; using System.ComponentModel.Design; using System.Drawing; using System.Workflow.ComponentModel; using System.Workflow.ComponentModel.Design; using System.Collections.Generic; using System.Workflow.ComponentModel.Compiler; #endregion [SRDescription(SR.SequenceActivityDescription)] [ToolboxItem(typeof(ActivityToolboxItem))] [Designer(typeof(SequenceDesigner), typeof(IDesigner))] [ToolboxBitmap(typeof(SequenceActivity), "Resources.Sequence.png")] [SRCategory(SR.Standard)] public class SequenceActivity : CompositeActivity, IActivityEventListener{ #region Constructors public SequenceActivity() { } public SequenceActivity(string name) : base(name) { } #endregion private static readonly DependencyProperty SequenceFaultingProperty = DependencyProperty.Register("SequenceFaulting", typeof(bool), typeof(SequenceActivity)); private static readonly DependencyProperty ActiveChildQualifiedNameProperty = DependencyProperty.Register("ActiveChildQualifiedName", typeof(string), typeof(SequenceActivity)); [NonSerialized] private bool activeChildRemovedInDynamicUpdate = false; #region Protected Methods protected override ActivityExecutionStatus Execute(ActivityExecutionContext executionContext) { if (executionContext == null) throw new ArgumentNullException("executionContext"); if (this.EnabledActivities.Count == 0) { OnSequenceComplete(executionContext); return ActivityExecutionStatus.Closed; } else { this.EnabledActivities[0].RegisterForStatusChange(Activity.ClosedEvent, this); executionContext.ExecuteActivity(this.EnabledActivities[0]); this.SetValue(ActiveChildQualifiedNameProperty, this.EnabledActivities[0].QualifiedName); return ActivityExecutionStatus.Executing; } } protected override ActivityExecutionStatus Cancel(ActivityExecutionContext executionContext) { if (executionContext == null) throw new ArgumentNullException("executionContext"); for (int i = (this.EnabledActivities.Count - 1); i >= 0; i--) { Activity childActivity = this.EnabledActivities[i]; if (childActivity.ExecutionStatus == ActivityExecutionStatus.Executing) { executionContext.CancelActivity(childActivity); return ActivityExecutionStatus.Canceling; } if (childActivity.ExecutionStatus == ActivityExecutionStatus.Canceling || childActivity.ExecutionStatus == ActivityExecutionStatus.Faulting) return ActivityExecutionStatus.Canceling; if (childActivity.ExecutionStatus == ActivityExecutionStatus.Closed) { this.RemoveProperty(ActiveChildQualifiedNameProperty); return ActivityExecutionStatus.Closed; } } return ActivityExecutionStatus.Closed; } protected override ActivityExecutionStatus HandleFault(ActivityExecutionContext executionContext, Exception exception) { this.SetValue(SequenceFaultingProperty, true); ActivityExecutionStatus executionStatus = base.HandleFault(executionContext, exception); if (executionStatus == ActivityExecutionStatus.Closed) this.RemoveProperty(SequenceFaultingProperty); return executionStatus; } #endregion #region IActivityEventListener Implementation void IActivityEventListener .OnEvent(Object sender, ActivityExecutionStatusChangedEventArgs e) { if (sender == null) throw new ArgumentNullException("sender"); if (e == null) throw new ArgumentNullException("e"); ActivityExecutionContext context = sender as ActivityExecutionContext; if (context == null) throw new ArgumentException(SR.Error_SenderMustBeActivityExecutionContext, "sender"); e.Activity.UnregisterForStatusChange(Activity.ClosedEvent, this); SequenceActivity sequenceActivity = context.Activity as SequenceActivity; if (sequenceActivity == null) throw new ArgumentException("sender"); if (sequenceActivity.ExecutionStatus == ActivityExecutionStatus.Canceling || (sequenceActivity.ExecutionStatus == ActivityExecutionStatus.Faulting) && (bool)this.GetValue(SequenceFaultingProperty)) { if(sequenceActivity.ExecutionStatus == ActivityExecutionStatus.Faulting) this.RemoveProperty(SequenceFaultingProperty); this.RemoveProperty(ActiveChildQualifiedNameProperty); context.CloseActivity(); } else if (sequenceActivity.ExecutionStatus == ActivityExecutionStatus.Executing) { if (!TryScheduleNextChild(context)) { OnSequenceComplete(context); context.CloseActivity(); } } } #endregion #region Private Implementation private bool TryScheduleNextChild(ActivityExecutionContext executionContext) { if (executionContext == null) throw new ArgumentNullException("executionContext"); IList seqList = this.EnabledActivities; if (seqList.Count == 0) return false; //Find index of next activity to run. int indexOfNextActivity = 0; for (int i = (seqList.Count - 1); i >= 0; i--) { if (seqList[i].ExecutionStatus == ActivityExecutionStatus.Closed) { //Check whether this is last child? if (i == (seqList.Count - 1)) return false; indexOfNextActivity = i + 1; break; } } seqList[indexOfNextActivity].RegisterForStatusChange(Activity.ClosedEvent, this); executionContext.ExecuteActivity(seqList[indexOfNextActivity]); this.SetValue(ActiveChildQualifiedNameProperty, seqList[indexOfNextActivity].QualifiedName); return true; } protected virtual void OnSequenceComplete(ActivityExecutionContext executionContext) { if (executionContext == null) throw new ArgumentNullException("executionContext"); this.RemoveProperty(ActiveChildQualifiedNameProperty); } #endregion #region Dynamic Update Handler protected override void OnActivityChangeRemove(ActivityExecutionContext executionContext, Activity removedActivity) { String activeChildQualifiedName = this.GetValue(ActiveChildQualifiedNameProperty) as String; if (removedActivity.QualifiedName.Equals(activeChildQualifiedName)) activeChildRemovedInDynamicUpdate = true; base.OnActivityChangeRemove(executionContext, removedActivity); } protected override void OnWorkflowChangesCompleted(ActivityExecutionContext executionContext) { String activeChildQualifiedName = this.GetValue(ActiveChildQualifiedNameProperty) as String; if (activeChildQualifiedName != null && activeChildRemovedInDynamicUpdate) { //We have our active child removed. if (this.ExecutionStatus == ActivityExecutionStatus.Canceling || (this.ExecutionStatus == ActivityExecutionStatus.Faulting) && (bool)this.GetValue(SequenceFaultingProperty)) { if (this.ExecutionStatus == ActivityExecutionStatus.Faulting) this.RemoveProperty(SequenceFaultingProperty); this.RemoveProperty(ActiveChildQualifiedNameProperty); executionContext.CloseActivity(); } else if (this.ExecutionStatus == ActivityExecutionStatus.Executing) { if (!TryScheduleNextChild(executionContext)) { OnSequenceComplete(executionContext); executionContext.CloseActivity(); } } } activeChildRemovedInDynamicUpdate = false; base.OnWorkflowChangesCompleted(executionContext); } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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