Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WF / Common / AuthoringOM / Sequence.cs / 1305376 / Sequence.cs
namespace System.Workflow.ComponentModel { #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 internal static class SequenceHelper { private static DependencyProperty ActiveChildQualifiedNameProperty = DependencyProperty.RegisterAttached("ActiveChildQualifiedName", typeof(String), typeof(SequenceHelper)); private static DependencyProperty ActiveChildRemovedProperty = DependencyProperty.RegisterAttached("ActiveChildRemoved", typeof(bool), typeof(SequenceHelper), new PropertyMetadata(DependencyPropertyOptions.NonSerialized)); public static ActivityExecutionStatus Execute(CompositeActivity activity, ActivityExecutionContext executionContext) { if (activity.EnabledActivities.Count == 0) return ActivityExecutionStatus.Closed; else { activity.EnabledActivities[0].RegisterForStatusChange(Activity.ClosedEvent, (IActivityEventListener) activity); executionContext.ExecuteActivity(activity.EnabledActivities[0]); activity.SetValue(ActiveChildQualifiedNameProperty, activity.EnabledActivities[0].QualifiedName); return ActivityExecutionStatus.Executing; } } public static ActivityExecutionStatus Cancel(CompositeActivity activity, ActivityExecutionContext executionContext) { for (int i = (activity.EnabledActivities.Count - 1); i >= 0; i--) { Activity childActivity = activity.EnabledActivities[i]; if (childActivity.ExecutionStatus == ActivityExecutionStatus.Executing) { executionContext.CancelActivity(childActivity); return activity.ExecutionStatus; } if (childActivity.ExecutionStatus == ActivityExecutionStatus.Canceling || childActivity.ExecutionStatus == ActivityExecutionStatus.Faulting) { return activity.ExecutionStatus; } if (childActivity.ExecutionStatus == ActivityExecutionStatus.Closed) { activity.RemoveProperty(ActiveChildQualifiedNameProperty); return ActivityExecutionStatus.Closed; } } return ActivityExecutionStatus.Closed; } public static void OnEvent(CompositeActivity activity, Object sender, ActivityExecutionStatusChangedEventArgs e) { ActivityExecutionContext context = sender as ActivityExecutionContext; e.Activity.UnregisterForStatusChange(Activity.ClosedEvent, (IActivityEventListener )activity); if (activity.ExecutionStatus == ActivityExecutionStatus.Canceling || activity.ExecutionStatus == ActivityExecutionStatus.Faulting || activity.ExecutionStatus == ActivityExecutionStatus.Executing && !TryScheduleNextChild(activity, context)) { activity.RemoveProperty(ActiveChildQualifiedNameProperty); context.CloseActivity(); } } private static bool TryScheduleNextChild(CompositeActivity activity, ActivityExecutionContext executionContext) { IList children = activity.EnabledActivities; // Find index of next activity to run. int indexOfNextActivity = 0; for (int i = (children.Count - 1); i >= 0; i--) { if (children[i].ExecutionStatus == ActivityExecutionStatus.Closed) { // Check whether this is last child? if (i == (children.Count - 1)) return false; indexOfNextActivity = i + 1; break; } } children[indexOfNextActivity].RegisterForStatusChange(Activity.ClosedEvent, (IActivityEventListener )activity); executionContext.ExecuteActivity(children[indexOfNextActivity]); activity.SetValue(ActiveChildQualifiedNameProperty, children[indexOfNextActivity].QualifiedName); return true; } public static void OnActivityChangeRemove(CompositeActivity activity, ActivityExecutionContext executionContext, Activity removedActivity) { String activeChildQualifiedName = activity.GetValue(ActiveChildQualifiedNameProperty) as String; if (removedActivity.QualifiedName.Equals(activeChildQualifiedName)) activity.SetValue(ActiveChildRemovedProperty, true); } public static void OnWorkflowChangesCompleted(CompositeActivity activity, ActivityExecutionContext executionContext) { String activeChildQualifiedName = activity.GetValue(ActiveChildQualifiedNameProperty) as String; bool activeChildRemovedInDynamicUpdate = (bool)activity.GetValue(ActiveChildRemovedProperty); if (activeChildQualifiedName != null && activeChildRemovedInDynamicUpdate) { //We have our active child removed. if (activity.ExecutionStatus == ActivityExecutionStatus.Canceling || activity.ExecutionStatus == ActivityExecutionStatus.Faulting || activity.ExecutionStatus == ActivityExecutionStatus.Executing && !TryScheduleNextChild(activity, executionContext)) { activity.RemoveProperty(ActiveChildQualifiedNameProperty); executionContext.CloseActivity(); } } activity.RemoveProperty(ActiveChildRemovedProperty); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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