Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx35 / System.WorkflowServices / System / Workflow / Activities / ContextTokenTypeConverter.cs / 1305376 / ContextTokenTypeConverter.cs
//---------------------------------------------------------------- // Copyright (c) Microsoft Corporation. All rights reserved. //--------------------------------------------------------------- namespace System.Workflow.Activities { using System; using System.Xml; using System.ComponentModel; using System.ComponentModel.Design; using System.ComponentModel.Design.Serialization; using System.Reflection; using System.Collections; using System.Collections.Generic; using System.Collections.Specialized; using System.Diagnostics; using System.Runtime.Serialization; using System.Workflow.ComponentModel; using System.Workflow.ComponentModel.Design; using System.Workflow.ComponentModel.Serialization; using System.Workflow.Runtime; using System.Globalization; internal sealed class ContextTokenTypeConverter : ExpandableObjectConverter { public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) { return (sourceType == typeof(string)); } public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) { return (destinationType == typeof(string)); } public override object ConvertFrom(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value) { object convertedValue = null; string contextName = value as String; if (!String.IsNullOrEmpty(contextName)) { foreach (object obj in GetStandardValues(context)) { ContextToken contextToken = obj as ContextToken; if (contextToken != null && contextToken.Name == contextName) { convertedValue = contextToken; break; } } if (convertedValue == null) { convertedValue = new ContextToken(contextName); } } return convertedValue; } public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType) { object convertedValue = null; ContextToken contextToken = value as ContextToken; if (destinationType == typeof(string) && contextToken != null) { convertedValue = contextToken.Name; } return convertedValue; } public override PropertyDescriptorCollection GetProperties(ITypeDescriptorContext context, object value, Attribute[] attributes) { PropertyDescriptorCollection properties = base.GetProperties(context, value, attributes); ArrayList props = new ArrayList(properties); return new PropertyDescriptorCollection((PropertyDescriptor[]) props.ToArray(typeof(PropertyDescriptor))); } public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context) { ArrayList values = new ArrayList(); Activity activity = context.Instance as Activity; if (activity != null) { foreach (Activity preceedingActivity in GetPreceedingActivities(activity)) { PropertyDescriptor contextTokenProperty = TypeDescriptor.GetProperties(preceedingActivity)["ContextToken"] as PropertyDescriptor; if (contextTokenProperty != null) { ContextToken contextToken = contextTokenProperty.GetValue(preceedingActivity) as ContextToken; if (contextToken != null && !values.Contains(contextToken)) { values.Add(contextToken); } } } } return new StandardValuesCollection(values); } public override bool GetStandardValuesExclusive(ITypeDescriptorContext context) { return false; } public override bool GetStandardValuesSupported(ITypeDescriptorContext context) { return true; } private IEnumerable GetContainedActivities(CompositeActivity activity) { if (!activity.Enabled) { yield break; } foreach (Activity containedActivity in activity.Activities) { if (containedActivity.Enabled) { yield return containedActivity; if (containedActivity is CompositeActivity) { foreach (Activity nestedActivity in GetContainedActivities((CompositeActivity) containedActivity)) { if (nestedActivity.Enabled) { yield return nestedActivity; } } } } } yield break; } private IEnumerable GetPreceedingActivities(Activity startActivity) { Activity currentActivity = null; StackactivityStack = new Stack (); activityStack.Push(startActivity); while ((currentActivity = activityStack.Pop()) != null) { if (currentActivity.Parent != null) { foreach (Activity siblingActivity in currentActivity.Parent.Activities) { if (siblingActivity == currentActivity) { continue; } if (siblingActivity.Enabled) { yield return siblingActivity; if (siblingActivity is CompositeActivity) { foreach (Activity containedActivity in GetContainedActivities((CompositeActivity) siblingActivity)) { yield return containedActivity; } } } } } activityStack.Push(currentActivity.Parent); } yield break; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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