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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.ComponentModel;
using System.ComponentModel.Design;
using System.ComponentModel.Design.Serialization;
using System.Drawing;
using System.Workflow.ComponentModel;
using System.Workflow.ComponentModel.Design;
using System.Collections.Generic;
using System.Workflow.ComponentModel.Compiler;
using System.Workflow.Activities.Common;
#endregion
[SRDescription(SR.WhileActivityDescription)]
[ToolboxItem(typeof(ActivityToolboxItem))]
[Designer(typeof(WhileDesigner), typeof(IDesigner))]
[ActivityValidator(typeof(WhileValidator))]
[ToolboxBitmap(typeof(WhileActivity), "Resources.While.png")]
[Obsolete("The System.Workflow.* types are deprecated. Instead, please use the new types from System.Activities.*")]
public sealed class WhileActivity : CompositeActivity, IActivityEventListener<ActivityExecutionStatusChangedEventArgs>
{
#region Dependency Properties
//metadata properties go here
public static readonly DependencyProperty ConditionProperty = DependencyProperty.Register("Condition", typeof(ActivityCondition), typeof(WhileActivity), new PropertyMetadata(DependencyPropertyOptions.Metadata, new Attribute[] { new ValidationOptionAttribute(ValidationOption.Required) }));
#endregion
#region Constructors
public WhileActivity()
{
}
public WhileActivity(string name)
: base(name)
{
}
#endregion
#region Public Properties
[SRCategory(SR.Conditions)]
[SRDescription(SR.WhileConditionDescr)]
public ActivityCondition Condition
{
get
{
return base.GetValue(ConditionProperty) as ActivityCondition;
}
set
{
base.SetValue(ConditionProperty, value);
}
}
[Browsable(false)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public Activity DynamicActivity
{
get
{
if (this.EnabledActivities.Count > 0)
{
Activity[] dynamicChildren = this.GetDynamicActivities(this.EnabledActivities[0]);
if (dynamicChildren.Length != 0)
return dynamicChildren[0];
}
return null;
}
}
#endregion
#region Protected Methods
protected override ActivityExecutionStatus Execute(ActivityExecutionContext executionContext)
{
if (executionContext == null)
throw new ArgumentNullException("executionContext");
if (TryNextIteration(executionContext))
return ActivityExecutionStatus.Executing;
return ActivityExecutionStatus.Closed;
}
protected override ActivityExecutionStatus Cancel(ActivityExecutionContext executionContext)
{
if (executionContext == null)
throw new ArgumentNullException("executionContext");
if (this.EnabledActivities.Count == 0)
return ActivityExecutionStatus.Closed;
Activity childActivity = this.EnabledActivities[0];
ActivityExecutionContextManager contextManager = executionContext.ExecutionContextManager;
ActivityExecutionContext childContext = contextManager.GetExecutionContext(childActivity);
if (childContext != null)
{
if (childContext.Activity.ExecutionStatus == ActivityExecutionStatus.Executing)
childContext.CancelActivity(childContext.Activity);
return ActivityExecutionStatus.Canceling;
}
return ActivityExecutionStatus.Closed;
}
#endregion
#region Private Implementations
private bool TryNextIteration(ActivityExecutionContext context)
{
if (this.ExecutionStatus == ActivityExecutionStatus.Canceling || this.ExecutionStatus == ActivityExecutionStatus.Faulting || !this.Condition.Evaluate(this, context))
return false;
else
{
if (this.EnabledActivities.Count > 0)
{
ActivityExecutionContextManager contextManager = context.ExecutionContextManager;
ActivityExecutionContext innerContext = contextManager.CreateExecutionContext(this.EnabledActivities[0]);
innerContext.Activity.RegisterForStatusChange(Activity.ClosedEvent, this);
innerContext.ExecuteActivity(innerContext.Activity);
}
else
{
System.Diagnostics.Debug.Assert(false);
}
return true;
}
}
#endregion
#region IActivityEventListener<ActivityExecutionStatusChangedEventArgs> Members
void IActivityEventListener<ActivityExecutionStatusChangedEventArgs>.OnEvent(object sender, ActivityExecutionStatusChangedEventArgs e)
{
if (e == null)
throw new ArgumentNullException("e");
if (sender == null)
throw new ArgumentNullException("sender");
ActivityExecutionContext context = sender as ActivityExecutionContext;
if (context == null)
throw new ArgumentException(SR.Error_SenderMustBeActivityExecutionContext, "sender");
e.Activity.UnregisterForStatusChange(Activity.ClosedEvent, this);
ActivityExecutionContextManager contextManager = context.ExecutionContextManager;
contextManager.CompleteExecutionContext(contextManager.GetExecutionContext(e.Activity));
if (!TryNextIteration(context))
context.CloseActivity();
}
#endregion
}
#region Validator
internal sealed class WhileValidator : CompositeActivityValidator
{
public override ValidationErrorCollection Validate(ValidationManager manager, object obj)
{
ValidationErrorCollection validationErrors = new ValidationErrorCollection(base.Validate(manager, obj));
WhileActivity whileActivity = obj as WhileActivity;
if (whileActivity == null)
throw new ArgumentException(SR.GetString(SR.Error_UnexpectedArgumentType, typeof(WhileActivity).FullName), "obj");
if (whileActivity.EnabledActivities.Count != 1)
validationErrors.Add(new ValidationError(SR.GetString(SR.Error_WhileShouldHaveOneChild), ErrorNumbers.Error_WhileShouldHaveOneChild));
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.Executing &&
activity.ExecutionStatus != ActivityExecutionStatus.Closed)
{
return new ValidationError(SR.GetString(SR.Error_DynamicActivity2, activity.QualifiedName, Enum.GetName(typeof(ActivityExecutionStatus), activity.ExecutionStatus), activity.GetType().FullName), ErrorNumbers.Error_DynamicActivity2);
}
return null;
}
}
#endregion
}
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