Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WF / Activities / Conditional.cs / 1305376 / Conditional.cs
namespace System.Workflow.Activities { #region Imports using System; using System.Text; using System.Reflection; using System.Collections; using System.CodeDom; using System.Collections.Generic; using System.ComponentModel; using System.ComponentModel.Design; using System.Drawing; using System.Drawing.Drawing2D; using System.Drawing.Design; using System.Workflow.ComponentModel; using System.Runtime.Serialization; using System.Workflow.ComponentModel.Compiler; using System.Workflow.Activities.Common; #endregion [SRDescription(SR.ConditionalActivityDescription)] [ToolboxItem(typeof(IfElseToolboxItem))] [Designer(typeof(IfElseDesigner), typeof(IDesigner))] [SRCategory(SR.Standard)] [ToolboxBitmap(typeof(IfElseActivity), "Resources.Decision.png")] [ActivityValidator(typeof(IfElseValidator))] public sealed class IfElseActivity: CompositeActivity , IActivityEventListener{ #region Constructors public IfElseActivity() { } public IfElseActivity(string name) : base(name) { } #endregion public IfElseBranchActivity AddBranch(ICollection activities) { if (activities == null) throw new ArgumentNullException("activities"); return AddBranch(activities, null); } public IfElseBranchActivity AddBranch(ICollection activities, ActivityCondition branchCondition) { if (activities == null) throw new ArgumentNullException("activities"); if (!this.DesignMode) throw new InvalidOperationException(SR.GetString(SR.Error_ConditionalBranchUpdateAtRuntime)); IfElseBranchActivity branchActivity = new IfElseBranchActivity(); foreach(Activity activity in activities) branchActivity.Activities.Add(activity); branchActivity.Condition = branchCondition; this.Activities.Add(branchActivity); return branchActivity; } protected override ActivityExecutionStatus Execute(ActivityExecutionContext executionContext) { if (executionContext == null) throw new ArgumentNullException("executionContext"); bool noneTrue = true; for (int i = 0; i < this.EnabledActivities.Count; ++i) { IfElseBranchActivity branch = this.EnabledActivities[i] as IfElseBranchActivity; // Else case dont have enable condition so find them and enable it if (branch.Condition == null || branch.Condition.Evaluate(branch, executionContext)) { noneTrue = false; branch.RegisterForStatusChange(Activity.ClosedEvent, this); executionContext.ExecuteActivity(branch); break; } } return noneTrue ? ActivityExecutionStatus.Closed : ActivityExecutionStatus.Executing; } protected override ActivityExecutionStatus Cancel(ActivityExecutionContext executionContext) { bool canCloseNow = true; for (int i = 0; i < this.EnabledActivities.Count; ++i) { Activity childBranch = this.EnabledActivities[i]; if (childBranch.ExecutionStatus == ActivityExecutionStatus.Executing) { canCloseNow = false; executionContext.CancelActivity(childBranch); break; } else if (childBranch.ExecutionStatus == ActivityExecutionStatus.Canceling || childBranch.ExecutionStatus == ActivityExecutionStatus.Faulting) { canCloseNow = false; break; } } return canCloseNow ? ActivityExecutionStatus.Closed : ActivityExecutionStatus.Canceling; } 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"); context.CloseActivity(); } } internal sealed class IfElseValidator : CompositeActivityValidator { public override ValidationErrorCollection Validate(ValidationManager manager, object obj) { ValidationErrorCollection validationErrors = base.Validate(manager, obj); IfElseActivity ifElse = obj as IfElseActivity; if (ifElse == null) throw new ArgumentException(SR.GetString(SR.Error_UnexpectedArgumentType, typeof(IfElseActivity).FullName), "obj"); // Validate number of children if (ifElse.EnabledActivities.Count < 1) validationErrors.Add(new ValidationError(SR.GetString(SR.Error_ConditionalLessThanOneChildren), ErrorNumbers.Error_IfElseLessThanOneChildren)); // all child activities must be IfElse branch foreach (Activity activity in ifElse.EnabledActivities) { if (!(activity is IfElseBranchActivity)) { validationErrors.Add(new ValidationError(SR.GetString(SR.Error_ConditionalDeclNotAllConditionalBranchDecl), ErrorNumbers.Error_IfElseNotAllIfElseBranchDecl)); break; } } return validationErrors; } public override ValidationError ValidateActivityChange(Activity activity, ActivityChangeAction action) { if (activity == null) throw new ArgumentNullException("activity"); if (action == null) throw new ArgumentNullException("action"); if (activity.ExecutionStatus != ActivityExecutionStatus.Initialized && activity.ExecutionStatus != ActivityExecutionStatus.Closed) { return new ValidationError(SR.GetString(SR.Error_DynamicActivity, activity.QualifiedName, Enum.GetName(typeof(ActivityExecutionStatus), activity.ExecutionStatus)), ErrorNumbers.Error_DynamicActivity); } return null; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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