BindingEditor.xaml.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / Tools / System.Activities.Core.Presentation / System / ServiceModel / Activities / Presentation / BindingEditor.xaml.cs / 1305376 / BindingEditor.xaml.cs
                        
                        
                            //---------------------------------------------------------------- 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//---------------------------------------------------------------
namespace System.ServiceModel.Activities.Presentation
{ 
    using System.Collections.Generic;
    using System.Linq; 
    using System.ServiceModel; 
    using System.ServiceModel.Channels;
    using System.Windows; 
    using System.Windows.Controls;
    using System.Activities.Presentation.Model;
    using System.Configuration;
    using System.ServiceModel.Configuration; 
    using System.Activities.Presentation;
 
    partial class BindingEditor 
    {
        public static readonly DependencyProperty BindingProperty = 
            DependencyProperty.Register("Binding",
            typeof(object),
            typeof(BindingEditor),
            new PropertyMetadata(OnBindingChanged)); 

        List bindingElements = new List(); 
 
        bool isInitializing;
 
        public BindingEditor()
        {
            InitializeComponent();
        } 

        public object Binding 
        { 
            get { return GetValue(BindingProperty); }
            set { SetValue(BindingProperty, value); } 
        }

        void LoadBindings()
        { 
            try
            { 
                this.bindingElements.Add(new BindingDescriptor { BindingName = (string)(this.TryFindResource("bindingEditorEmptyBindingLabel") ?? "none"), Value = null }); 
                Configuration machineConfig = ConfigurationManager.OpenMachineConfiguration();
                ServiceModelSectionGroup section = ServiceModelSectionGroup.GetSectionGroup(machineConfig); 
                if (null != section && null != section.Bindings)
                {
                    this.bindingElements.AddRange(section.Bindings.BindingCollections.
                        OrderBy(p => p.BindingName). 
                        Select(p => new BindingDescriptor() { BindingName = p.BindingName, Value = p }));
                } 
            } 
            catch (ConfigurationErrorsException err)
            { 
                ErrorReporting.ShowErrorMessage(err.Message);
            }
        }
 
        protected override void OnInitialized(EventArgs e)
        { 
            base.OnInitialized(e); 
            this.isInitializing = true;
            LoadBindings(); 
            this.ItemsSource = this.bindingElements;
            this.SelectedIndex = 0;
            this.isInitializing = false;
        } 

        protected override void OnSelectionChanged(SelectionChangedEventArgs e) 
        { 
            base.OnSelectionChanged(e);
            if (!this.isInitializing) 
            {

                BindingDescriptor entry = (BindingDescriptor)e.AddedItems[0];
                if (null == entry.Value) 
                {
                    Binding = null; 
                } 
                // try to avoid blowing away any binding that has been custom-tweaked in XAML.
                else if (Binding == null || !(Binding is ModelItem) || !((ModelItem)Binding).ItemType.Equals(entry.Value.BindingType)) 
                {
                    Binding instance = (Binding)Activator.CreateInstance(entry.Value.BindingType);
                    instance.Name = entry.BindingName;
                    Binding = instance; 
                }
            } 
        } 

        static void OnBindingChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args) 
        {
            BindingEditor editor = (BindingEditor)sender;
            object newValue = args.NewValue;
 
            Type bindingType = null;
            ModelItem item = newValue as ModelItem; 
            string bindingName = null; 
            if (item != null)
            { 
                bindingType = item.ItemType;
                bindingName = (string)item.Properties["Name"].ComputedValue;
            }
            else if (newValue != null) 
            {
                bindingType = newValue.GetType(); 
                if (typeof(Binding).IsAssignableFrom(bindingType)) 
                {
                    bindingName = ((Binding)newValue).Name; 
                }
            }

            // Make combo appear empty if the binding is not one of the ones known to us, e.g., has been custom-tweaked in XAML. 
            BindingDescriptor toSelect = null;
            Func where = p => null != p.Value && p.Value.BindingType == bindingType; 
            if (editor.bindingElements.Count(where) > 1) 
            {
                toSelect = editor.bindingElements.Where(where).Where(p => string.Equals(p.BindingName, bindingName)).FirstOrDefault(); 
            }
            else
            {
                toSelect = editor.bindingElements.Where(where).FirstOrDefault(); 
            }
            //prevent OnSelectionChanged now - the binding is set directly to the object, no need to set again through event handler 
            editor.isInitializing = true; 
            if (null != toSelect)
            { 
                editor.SelectedItem = toSelect;
            }
            else
            { 
                editor.SelectedIndex = 0;
            } 
            //allow selection changed events to be consumed again 
            editor.isInitializing = false;
        } 

        sealed class BindingDescriptor
        {
            public string BindingName 
            {
                get; 
                internal set; 
            }
 
            public BindingCollectionElement Value
            {
                get;
                internal set; 
            }
 
            public override string ToString() 
            {
                return BindingName; 
            }
        }
    }
} 

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

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