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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))]
[Obsolete("The System.Workflow.* types are deprecated. Instead, please use the new types from System.Activities.*")]
public sealed class IfElseActivity : CompositeActivity, IActivityEventListener<ActivityExecutionStatusChangedEventArgs>
{
#region Constructors
public IfElseActivity()
{
}
public IfElseActivity(string name)
: base(name)
{
}
#endregion
public IfElseBranchActivity AddBranch(ICollection<Activity> activities)
{
if (activities == null)
throw new ArgumentNullException("activities");
return AddBranch(activities, null);
}
public IfElseBranchActivity AddBranch(ICollection<Activity> 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<ActivityExecutionStatusChangedEventArgs>.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;
}
}
}
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