ChannelToken.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx35 / System.WorkflowServices / System / Workflow / Activities / ChannelToken.cs / 1305376 / ChannelToken.cs
                        
                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------

namespace System.Workflow.Activities 
{
    using System; 
    using System.Collections; 
    using System.Collections.Generic;
    using System.Collections.Specialized; 
    using System.ComponentModel;
    using System.ComponentModel.Design;
    using System.ComponentModel.Design.Serialization;
    using System.Diagnostics.CodeAnalysis; 
    using System.ServiceModel;
    using System.ServiceModel.Channels; 
    using System.ServiceModel.Dispatcher; 
    using System.Workflow.ComponentModel;
    using System.Workflow.ComponentModel.Design; 
    using System.Workflow.ComponentModel.Serialization;
    using System.Xml;

    [DesignerSerializer(typeof(DependencyObjectCodeDomSerializer), typeof(CodeDomSerializer))] 
    [TypeConverter(typeof(ChannelTokenTypeConverter))]
    public sealed class ChannelToken : DependencyObject, IPropertyValueProvider 
    { 
        [SuppressMessage("Microsoft.Security", "CA2104:DoNotDeclareReadOnlyMutableReferenceTypes")]
        internal static readonly DependencyProperty EndpointNameProperty = 
            DependencyProperty.Register("EndpointName",
            typeof(string),
            typeof(ChannelToken),
            new PropertyMetadata(null)); 

        [SuppressMessage("Microsoft.Security", "CA2104:DoNotDeclareReadOnlyMutableReferenceTypes")] 
        internal static readonly DependencyProperty NameProperty = 
            DependencyProperty.Register("Name",
            typeof(string), 
            typeof(ChannelToken),
            new PropertyMetadata(null, DependencyPropertyOptions.Metadata,
            new Attribute[] { new BrowsableAttribute(false) }));
 
        [SuppressMessage("Microsoft.Security", "CA2104:DoNotDeclareReadOnlyMutableReferenceTypes")]
        internal static readonly DependencyProperty OwnerActivityNameProperty = 
            DependencyProperty.Register("OwnerActivityName", 
            typeof(string),
            typeof(ChannelToken), 
            new PropertyMetadata(null, DependencyPropertyOptions.Metadata,
            new Attribute[] { new TypeConverterAttribute(typeof(PropertyValueProviderTypeConverter)) }));

        public ChannelToken() 
        {
        } 
 
        internal ChannelToken(string name)
        { 
            this.Name = name;
        }

        [DefaultValue(null)] 
        [SR2Description(SR2DescriptionAttribute.ChannelToken_EndpointName_Description)]
        public string EndpointName 
        { 
            get
            { 
                return (string) GetValue(EndpointNameProperty);
            }

            set 
            {
                SetValue(EndpointNameProperty, value); 
            } 
        }
 
        [Browsable(false)]
        [DefaultValue(null)]
        [SR2Description(SR2DescriptionAttribute.ChannelToken_Name_Description)]
        public string Name 
        {
            get 
            { 
                return (string) GetValue(NameProperty);
            } 
            set
            {
                SetValue(NameProperty, value);
            } 
        }
 
        [DefaultValue(null)] 
        [TypeConverter(typeof(PropertyValueProviderTypeConverter))]
        [SR2Description(SR2DescriptionAttribute.ChannelToken_OwnerActivityName_Description)] 
        public string OwnerActivityName
        {
            get
            { 
                return (string) GetValue(OwnerActivityNameProperty);
            } 
 
            set
            { 
                SetValue(OwnerActivityNameProperty, value);
            }
        }
 
        ICollection IPropertyValueProvider.GetPropertyValues(ITypeDescriptorContext context)
        { 
            StringCollection names = new StringCollection(); 

            if (string.Equals(context.PropertyDescriptor.Name, "OwnerActivityName", StringComparison.Ordinal)) 
            {
                ISelectionService selectionService = context.GetService(typeof(ISelectionService)) as ISelectionService;
                if (selectionService != null && selectionService.SelectionCount == 1 && selectionService.PrimarySelection is Activity)
                { 
                    // add empty string as an option
                    // 
                    names.Add(string.Empty); 

                    Activity currentActivity = selectionService.PrimarySelection as Activity; 

                    foreach (Activity activity in GetEnclosingCompositeActivities(currentActivity))
                    {
                        string activityId = activity.QualifiedName; 
                        if (!names.Contains(activityId))
                        { 
                            names.Add(activityId); 
                        }
                    } 
                }
            }
            return names;
        } 

        internal static LogicalChannel GetLogicalChannel(Activity activity, 
            ChannelToken endpoint, 
            Type contractType)
        { 
            if (activity == null)
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("activity");
            } 
            if (endpoint == null)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("endpoint"); 
            }
            if (contractType == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("contractType");
            }
 
            return GetLogicalChannel(activity, endpoint.Name, endpoint.OwnerActivityName, contractType);
        } 
 
        internal static LogicalChannel GetLogicalChannel(Activity activity,
            string name, 
            string ownerActivityName,
            Type contractType)
        {
            if (activity == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("activity"); 
            } 
            if (string.IsNullOrEmpty(name))
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument("name",
                    SR2.GetString(SR2.Error_ArgumentValueNullOrEmptyString));
            }
            if (contractType == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("contractType"); 
            } 

            Activity contextActivity = activity.ContextActivity; 
            Activity owner = null;

            if (contextActivity == null)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
                    new InvalidOperationException(SR2.GetString(SR2.Error_ContextOwnerActivityMissing))); 
            } 

            if (string.IsNullOrEmpty(ownerActivityName)) 
            {
                owner = contextActivity.RootActivity;
            }
            else 
            {
                while (contextActivity != null) 
                { 
                    owner = contextActivity.GetActivityByName(ownerActivityName, true);
                    if (owner != null) 
                    {
                        break;
                    }
 
                    contextActivity = contextActivity.Parent;
                    if (contextActivity != null) 
                    { 
                        contextActivity = contextActivity.ContextActivity;
                    } 
                }
            }

            if (owner == null && !string.IsNullOrEmpty(ownerActivityName)) 
            {
                owner = Helpers.ParseActivityForBind(activity, ownerActivityName); 
            } 

            if (owner == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
                    new InvalidOperationException(SR2.GetString(SR2.Error_ContextOwnerActivityMissing)));
            } 

            LogicalChannel logicalChannel = null; 
 
            LogicalChannelCollection collection =
                owner.GetValue(LogicalChannelCollection.LogicalChannelCollectionProperty) as LogicalChannelCollection; 
            if (collection == null)
            {
                collection = new LogicalChannelCollection();
                owner.SetValue(LogicalChannelCollection.LogicalChannelCollectionProperty, collection); 

                logicalChannel = new LogicalChannel(name, contractType); 
                collection.Add(logicalChannel); 
            }
            else if (!collection.Contains(name)) 
            {
                logicalChannel = new LogicalChannel(name, contractType);
                collection.Add(logicalChannel);
            } 
            else
            { 
                logicalChannel = collection[name]; 
            }
 
            if (logicalChannel.ContractType != contractType)
            {
                logicalChannel = null;
            } 

            return logicalChannel; 
        } 

        internal static LogicalChannel Register(Activity activity, 
            ChannelToken endpoint,
            Type contractType)
        {
            if (activity == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("activity"); 
            } 
            if (endpoint == null)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("endpoint");
            }
            if (contractType == null)
            { 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("contractType");
            } 
 
            LogicalChannel logicalChannel = GetLogicalChannel(activity, endpoint, contractType);
            if (logicalChannel == null) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(
                    new InvalidOperationException(SR2.GetString(SR2.Error_FailedToRegisterChannel, endpoint.Name)));
            } 

            return logicalChannel; 
        } 

        private static IEnumerable GetEnclosingCompositeActivities(Activity startActivity) 
        {
            Activity currentActivity = null;
            Stack activityStack = new Stack();
            activityStack.Push(startActivity); 

            while ((currentActivity = activityStack.Pop()) != null) 
            { 
                if (currentActivity.Enabled)
                { 
                    yield return currentActivity;
                }
                activityStack.Push(currentActivity.Parent);
            } 
            yield break;
        } 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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ChannelToken.cs source code in C# .NET

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