XComponentModel.cs source code in C# .NET

                        
Code:
                         / Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / ndp / fx / src / XLinq / System / Xml / Linq / XComponentModel.cs / 2 / XComponentModel.cs
                        

                        
                            using System; 
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics.CodeAnalysis; 
using System.Linq;
using System.Xml.Linq; 
 
namespace System.Xml.Linq.ComponentModel
{ 

    [SuppressMessage("Microsoft.Performance", "CA1812:AvoidUninstantiatedInternalClasses", Justification="False positive.")]
    class XTypeDescriptionProvider : TypeDescriptionProvider
    { 
        public XTypeDescriptionProvider() : base(TypeDescriptor.GetProvider(typeof(T))) {
        } 
 
        public override ICustomTypeDescriptor GetTypeDescriptor(Type type, object instance) {
            return new XTypeDescriptor(base.GetTypeDescriptor(type, instance)); 
        }
    }

    class XTypeDescriptor : CustomTypeDescriptor 
    {
        public XTypeDescriptor(ICustomTypeDescriptor parent) : base(parent) { 
        } 

        public override PropertyDescriptorCollection GetProperties() { 
            return GetProperties(null);
        }

        public override PropertyDescriptorCollection GetProperties(Attribute[] attributes) { 
            PropertyDescriptorCollection properties = new PropertyDescriptorCollection(null);
            if (attributes == null) { 
                if (typeof(T) == typeof(XElement)) { 
                    properties.Add(new XElementAttributePropertyDescriptor());
                    properties.Add(new XElementDescendantsPropertyDescriptor()); 
                    properties.Add(new XElementElementPropertyDescriptor());
                    properties.Add(new XElementElementsPropertyDescriptor());
                    properties.Add(new XElementValuePropertyDescriptor());
                    properties.Add(new XElementXmlPropertyDescriptor()); 
                }
                else if (typeof(T) == typeof(XAttribute)) { 
                    properties.Add(new XAttributeValuePropertyDescriptor()); 
                }
            } 
            foreach (PropertyDescriptor property in base.GetProperties(attributes)) {
                properties.Add(property);
            }
            return properties; 
        }
    } 
 
    abstract class XPropertyDescriptor : PropertyDescriptor where T : XObject
    { 
        public XPropertyDescriptor(string name) : base(name, null) {
        }

        public override Type ComponentType { 
            get { return typeof(T); }
        } 
 
        public override bool IsReadOnly {
            get { return true; } 
        }

        public override Type PropertyType {
            get { return typeof(TProperty); } 
        }
 
        public override bool SupportsChangeEvents { 
            get { return true; }
        } 

        public override void AddValueChanged(object component, EventHandler handler) {
            bool hasValueChangedHandler = GetValueChangedHandler(component) != null;
            base.AddValueChanged(component, handler); 
            if (hasValueChangedHandler) return;
            T c = component as T; 
            if (c != null && GetValueChangedHandler(component) != null) { 
                c.Changing += new EventHandler(OnChanging);
                c.Changed += new EventHandler(OnChanged); 
            }
        }

        public override bool CanResetValue(object component) { 
            return false;
        } 
 
        public override void RemoveValueChanged(object component, EventHandler handler) {
            base.RemoveValueChanged(component, handler); 
            T c = component as T;
            if (c != null && GetValueChangedHandler(component) == null) {
                c.Changing -= new EventHandler(OnChanging);
                c.Changed -= new EventHandler(OnChanged); 
            }
        } 
 
        public override void ResetValue(object component) {
        } 

        public override void SetValue(object component, object value) {
        }
 
        public override bool ShouldSerializeValue(object component) {
            return false; 
        } 

        protected virtual void OnChanged(object sender, XObjectChangeEventArgs args) { 
        }

        protected virtual void OnChanging(object sender, XObjectChangeEventArgs args) {
        } 
    }
 
    class XElementAttributePropertyDescriptor : XPropertyDescriptor 
    {
        XDeferredSingleton value; 
        XAttribute changeState;

        public XElementAttributePropertyDescriptor() : base("Attribute") {
        } 

        public override object GetValue(object component) { 
            return value = new XDeferredSingleton((e, n) => e.Attribute(n), component as XElement, null); 
        }
 
        protected override void OnChanged(object sender, XObjectChangeEventArgs args) {
            if (value == null) return;
            switch (args.ObjectChange) {
                case XObjectChange.Add: 
                    XAttribute a = sender as XAttribute;
                    if (a != null && value.element == a.parent && value.name == a.Name) { 
                        OnValueChanged(value.element, EventArgs.Empty); 
                    }
                    break; 
                case XObjectChange.Remove:
                    a = sender as XAttribute;
                    if (a != null && changeState == a) {
                        changeState = null; 
                        OnValueChanged(value.element, EventArgs.Empty);
                    } 
                    break; 
            }
        } 

        protected override void OnChanging(object sender, XObjectChangeEventArgs args) {
            if (value == null) return;
            switch (args.ObjectChange) { 
                case XObjectChange.Remove:
                    XAttribute a = sender as XAttribute; 
                    changeState = a != null && value.element == a.parent && value.name == a.Name ? a : null; 
                    break;
            } 
        }
    }

    class XElementDescendantsPropertyDescriptor : XPropertyDescriptor> 
    {
        XDeferredAxis value; 
        XName changeState; 

        public XElementDescendantsPropertyDescriptor() : base("Descendants") { 
        }

        public override object GetValue(object component) {
            return value = new XDeferredAxis((e, n) => n != null ? e.Descendants(n) : e.Descendants(), component as XElement, null); 
        }
 
        protected override void OnChanged(object sender, XObjectChangeEventArgs args) { 
            if (value == null) return;
            switch (args.ObjectChange) { 
                case XObjectChange.Add:
                case XObjectChange.Remove:
                    XElement e = sender as XElement;
                    if (e != null && (value.name == e.Name || value.name == null)) { 
                        OnValueChanged(value.element, EventArgs.Empty);
                    } 
                    break; 
                case XObjectChange.Name:
                    e = sender as XElement; 
                    if (e != null && value.element != e && value.name != null && (value.name == e.Name || value.name == changeState)) {
                        changeState = null;
                        OnValueChanged(value.element, EventArgs.Empty);
                    } 
                    break;
            } 
        } 

        protected override void OnChanging(object sender, XObjectChangeEventArgs args) { 
            if (value == null) return;
            switch (args.ObjectChange) {
                case XObjectChange.Name:
                    XElement e = sender as XElement; 
                    changeState = e != null ? e.Name : null;
                    break; 
            } 
        }
    } 

    class XElementElementPropertyDescriptor : XPropertyDescriptor
    {
        XDeferredSingleton value; 
        XElement changeState;
 
        public XElementElementPropertyDescriptor() : base("Element") { 
        }
 
        public override object GetValue(object component) {
            return value = new XDeferredSingleton((e, n) => e.Element(n), component as XElement, null);
        }
 
        protected override void OnChanged(object sender, XObjectChangeEventArgs args) {
            if (value == null) return; 
            switch (args.ObjectChange) { 
                case XObjectChange.Add:
                    XElement e = sender as XElement; 
                    if (e != null && value.element == e.parent && value.name == e.Name && value.element.Element(value.name) == e) {
                        OnValueChanged(value.element, EventArgs.Empty);
                    }
                    break; 
                case XObjectChange.Remove:
                    e = sender as XElement; 
                    if (e != null && changeState == e) { 
                        changeState = null;
                        OnValueChanged(value.element, EventArgs.Empty); 
                    }
                    break;
                case XObjectChange.Name:
                    e = sender as XElement; 
                    if (e != null) {
                        if (value.element == e.parent && value.name == e.Name && value.element.Element(value.name) == e) { 
                            OnValueChanged(value.element, EventArgs.Empty); 
                        }
                        else if (changeState == e) { 
                            changeState = null;
                            OnValueChanged(value.element, EventArgs.Empty);
                        }
                    } 
                    break;
            } 
        } 

        protected override void OnChanging(object sender, XObjectChangeEventArgs args) { 
            if (value == null) return;
            switch (args.ObjectChange) {
                case XObjectChange.Remove:
                case XObjectChange.Name: 
                    XElement e = sender as XElement;
                    changeState = e != null && value.element == e.parent && value.name == e.Name && value.element.Element(value.name) == e ? e : null; 
                    break; 
            }
        } 
    }

    class XElementElementsPropertyDescriptor : XPropertyDescriptor>
    { 
        XDeferredAxis value;
        object changeState; 
 
        public XElementElementsPropertyDescriptor() : base("Elements") {
        } 

        public override object GetValue(object component) {
            return value = new XDeferredAxis((e, n) => n != null ? e.Elements(n) : e.Elements(), component as XElement, null);
        } 

        protected override void OnChanged(object sender, XObjectChangeEventArgs args) { 
            if (value == null) return; 
            switch (args.ObjectChange) {
                case XObjectChange.Add: 
                    XElement e = sender as XElement;
                    if (e != null && value.element == e.parent && (value.name == e.Name || value.name == null)) {
                        OnValueChanged(value.element, EventArgs.Empty);
                    } 
                    break;
                case XObjectChange.Remove: 
                    e = sender as XElement; 
                    if (e != null && value.element == (changeState as XContainer) && (value.name == e.Name || value.name == null)) {
                        changeState = null; 
                        OnValueChanged(value.element, EventArgs.Empty);
                    }
                    break;
                case XObjectChange.Name: 
                    e = sender as XElement;
                    if (e != null && value.element == e.parent && value.name != null && (value.name == e.Name || value.name == (changeState as XName))) { 
                        changeState = null; 
                        OnValueChanged(value.element, EventArgs.Empty);
                    } 
                    break;
            }
        }
 
        protected override void OnChanging(object sender, XObjectChangeEventArgs args) {
            if (value == null) return; 
            switch (args.ObjectChange) { 
                case XObjectChange.Remove:
                    XElement e = sender as XElement; 
                    changeState = e != null ? e.parent : null;
                    break;
                case XObjectChange.Name:
                    e = sender as XElement; 
                    changeState = e != null ? e.Name : null;
                    break; 
            } 
        }
    } 

    class XElementValuePropertyDescriptor : XPropertyDescriptor
    {
        XElement element; 

        public XElementValuePropertyDescriptor() : base("Value") { 
        } 

        public override bool IsReadOnly { 
            get { return false; }
        }

        public override object GetValue(object component) { 
            element = component as XElement;
            if (element == null) return string.Empty; 
            return element.Value; 
        }
 
        public override void SetValue(object component, object value) {
            element = component as XElement;
            if (element == null) return;
            element.Value = value as string; 
        }
 
        protected override void OnChanged(object sender, XObjectChangeEventArgs args) { 
            if (element == null) return;
            switch (args.ObjectChange) { 
                case XObjectChange.Add:
                case XObjectChange.Remove:
                    if (sender is XElement || sender is XText) {
                        OnValueChanged(element, EventArgs.Empty); 
                    }
                    break; 
                case XObjectChange.Value: 
                    if (sender is XText) {
                        OnValueChanged(element, EventArgs.Empty); 
                    }
                    break;
            }
        } 
    }
 
    class XElementXmlPropertyDescriptor : XPropertyDescriptor 
    {
        XElement element; 

        public XElementXmlPropertyDescriptor() : base("Xml") {
        }
 
        public override object GetValue(object component) {
            element = component as XElement; 
            if (element == null) return string.Empty; 
            return element.ToString(SaveOptions.DisableFormatting);
        } 

        protected override void OnChanged(object sender, XObjectChangeEventArgs args) {
            if (element == null) return;
            OnValueChanged(element, EventArgs.Empty); 
        }
    } 
 
    class XAttributeValuePropertyDescriptor : XPropertyDescriptor
    { 
        XAttribute attribute;

        public XAttributeValuePropertyDescriptor() : base("Value") {
        } 

        public override bool IsReadOnly { 
            get { return false; } 
        }
 
        public override object GetValue(object component) {
            attribute = component as XAttribute;
            if (attribute == null) return string.Empty;
            return attribute.Value; 
        }
 
        public override void SetValue(object component, object value) { 
            attribute = component as XAttribute;
            if (attribute == null) return; 
            attribute.Value = value as string;
        }

        protected override void OnChanged(object sender, XObjectChangeEventArgs args) { 
            if (attribute == null) return;
            if (args.ObjectChange == XObjectChange.Value) { 
                OnValueChanged(attribute, EventArgs.Empty); 
            }
        } 
    }

    class XDeferredAxis : IEnumerable, IEnumerable where T : XObject
    { 
        Func> func;
        internal XElement element; 
        internal XName name; 

        public XDeferredAxis(Func> func, XElement element, XName name) { 
            if (func == null) throw new ArgumentNullException("func");
            if (element == null) throw new ArgumentNullException("element");
            this.func = func;
            this.element = element; 
            this.name = name;
        } 
 
        public IEnumerator GetEnumerator() {
            return func(element, name).GetEnumerator(); 
        }

        IEnumerator IEnumerable.GetEnumerator() {
            return GetEnumerator(); 
        }
 
        public IEnumerable this[string expandedName] { 
            get {
                if (expandedName == null) throw new ArgumentNullException("expandedName"); 
                if (name == null) {
                    name = expandedName;
                }
                else if (name != expandedName) { 
                    return Enumerable.Empty();
                } 
                return this; 
            }
        } 
    }

    class XDeferredSingleton where T : XObject
    { 
        Func func;
        internal XElement element; 
        internal XName name; 

        public XDeferredSingleton(Func func, XElement element, XName name) { 
            if (func == null) throw new ArgumentNullException("func");
            if (element == null) throw new ArgumentNullException("element");
            this.func = func;
            this.element = element; 
            this.name = name;
        } 
 
        public T this[string expandedName] {
            get { 
                if (expandedName == null) throw new ArgumentNullException("expandedName");
                if (name == null) {
                    name = expandedName;
                } 
                else if (name != expandedName) {
                    return null; 
                } 
                return func(element, name);
            } 
        }
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
using System; 
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics.CodeAnalysis; 
using System.Linq;
using System.Xml.Linq; 
 
namespace System.Xml.Linq.ComponentModel
{ 

    [SuppressMessage("Microsoft.Performance", "CA1812:AvoidUninstantiatedInternalClasses", Justification="False positive.")]
    class XTypeDescriptionProvider : TypeDescriptionProvider
    { 
        public XTypeDescriptionProvider() : base(TypeDescriptor.GetProvider(typeof(T))) {
        } 
 
        public override ICustomTypeDescriptor GetTypeDescriptor(Type type, object instance) {
            return new XTypeDescriptor(base.GetTypeDescriptor(type, instance)); 
        }
    }

    class XTypeDescriptor : CustomTypeDescriptor 
    {
        public XTypeDescriptor(ICustomTypeDescriptor parent) : base(parent) { 
        } 

        public override PropertyDescriptorCollection GetProperties() { 
            return GetProperties(null);
        }

        public override PropertyDescriptorCollection GetProperties(Attribute[] attributes) { 
            PropertyDescriptorCollection properties = new PropertyDescriptorCollection(null);
            if (attributes == null) { 
                if (typeof(T) == typeof(XElement)) { 
                    properties.Add(new XElementAttributePropertyDescriptor());
                    properties.Add(new XElementDescendantsPropertyDescriptor()); 
                    properties.Add(new XElementElementPropertyDescriptor());
                    properties.Add(new XElementElementsPropertyDescriptor());
                    properties.Add(new XElementValuePropertyDescriptor());
                    properties.Add(new XElementXmlPropertyDescriptor()); 
                }
                else if (typeof(T) == typeof(XAttribute)) { 
                    properties.Add(new XAttributeValuePropertyDescriptor()); 
                }
            } 
            foreach (PropertyDescriptor property in base.GetProperties(attributes)) {
                properties.Add(property);
            }
            return properties; 
        }
    } 
 
    abstract class XPropertyDescriptor : PropertyDescriptor where T : XObject
    { 
        public XPropertyDescriptor(string name) : base(name, null) {
        }

        public override Type ComponentType { 
            get { return typeof(T); }
        } 
 
        public override bool IsReadOnly {
            get { return true; } 
        }

        public override Type PropertyType {
            get { return typeof(TProperty); } 
        }
 
        public override bool SupportsChangeEvents { 
            get { return true; }
        } 

        public override void AddValueChanged(object component, EventHandler handler) {
            bool hasValueChangedHandler = GetValueChangedHandler(component) != null;
            base.AddValueChanged(component, handler); 
            if (hasValueChangedHandler) return;
            T c = component as T; 
            if (c != null && GetValueChangedHandler(component) != null) { 
                c.Changing += new EventHandler(OnChanging);
                c.Changed += new EventHandler(OnChanged); 
            }
        }

        public override bool CanResetValue(object component) { 
            return false;
        } 
 
        public override void RemoveValueChanged(object component, EventHandler handler) {
            base.RemoveValueChanged(component, handler); 
            T c = component as T;
            if (c != null && GetValueChangedHandler(component) == null) {
                c.Changing -= new EventHandler(OnChanging);
                c.Changed -= new EventHandler(OnChanged); 
            }
        } 
 
        public override void ResetValue(object component) {
        } 

        public override void SetValue(object component, object value) {
        }
 
        public override bool ShouldSerializeValue(object component) {
            return false; 
        } 

        protected virtual void OnChanged(object sender, XObjectChangeEventArgs args) { 
        }

        protected virtual void OnChanging(object sender, XObjectChangeEventArgs args) {
        } 
    }
 
    class XElementAttributePropertyDescriptor : XPropertyDescriptor 
    {
        XDeferredSingleton value; 
        XAttribute changeState;

        public XElementAttributePropertyDescriptor() : base("Attribute") {
        } 

        public override object GetValue(object component) { 
            return value = new XDeferredSingleton((e, n) => e.Attribute(n), component as XElement, null); 
        }
 
        protected override void OnChanged(object sender, XObjectChangeEventArgs args) {
            if (value == null) return;
            switch (args.ObjectChange) {
                case XObjectChange.Add: 
                    XAttribute a = sender as XAttribute;
                    if (a != null && value.element == a.parent && value.name == a.Name) { 
                        OnValueChanged(value.element, EventArgs.Empty); 
                    }
                    break; 
                case XObjectChange.Remove:
                    a = sender as XAttribute;
                    if (a != null && changeState == a) {
                        changeState = null; 
                        OnValueChanged(value.element, EventArgs.Empty);
                    } 
                    break; 
            }
        } 

        protected override void OnChanging(object sender, XObjectChangeEventArgs args) {
            if (value == null) return;
            switch (args.ObjectChange) { 
                case XObjectChange.Remove:
                    XAttribute a = sender as XAttribute; 
                    changeState = a != null && value.element == a.parent && value.name == a.Name ? a : null; 
                    break;
            } 
        }
    }

    class XElementDescendantsPropertyDescriptor : XPropertyDescriptor> 
    {
        XDeferredAxis value; 
        XName changeState; 

        public XElementDescendantsPropertyDescriptor() : base("Descendants") { 
        }

        public override object GetValue(object component) {
            return value = new XDeferredAxis((e, n) => n != null ? e.Descendants(n) : e.Descendants(), component as XElement, null); 
        }
 
        protected override void OnChanged(object sender, XObjectChangeEventArgs args) { 
            if (value == null) return;
            switch (args.ObjectChange) { 
                case XObjectChange.Add:
                case XObjectChange.Remove:
                    XElement e = sender as XElement;
                    if (e != null && (value.name == e.Name || value.name == null)) { 
                        OnValueChanged(value.element, EventArgs.Empty);
                    } 
                    break; 
                case XObjectChange.Name:
                    e = sender as XElement; 
                    if (e != null && value.element != e && value.name != null && (value.name == e.Name || value.name == changeState)) {
                        changeState = null;
                        OnValueChanged(value.element, EventArgs.Empty);
                    } 
                    break;
            } 
        } 

        protected override void OnChanging(object sender, XObjectChangeEventArgs args) { 
            if (value == null) return;
            switch (args.ObjectChange) {
                case XObjectChange.Name:
                    XElement e = sender as XElement; 
                    changeState = e != null ? e.Name : null;
                    break; 
            } 
        }
    } 

    class XElementElementPropertyDescriptor : XPropertyDescriptor
    {
        XDeferredSingleton value; 
        XElement changeState;
 
        public XElementElementPropertyDescriptor() : base("Element") { 
        }
 
        public override object GetValue(object component) {
            return value = new XDeferredSingleton((e, n) => e.Element(n), component as XElement, null);
        }
 
        protected override void OnChanged(object sender, XObjectChangeEventArgs args) {
            if (value == null) return; 
            switch (args.ObjectChange) { 
                case XObjectChange.Add:
                    XElement e = sender as XElement; 
                    if (e != null && value.element == e.parent && value.name == e.Name && value.element.Element(value.name) == e) {
                        OnValueChanged(value.element, EventArgs.Empty);
                    }
                    break; 
                case XObjectChange.Remove:
                    e = sender as XElement; 
                    if (e != null && changeState == e) { 
                        changeState = null;
                        OnValueChanged(value.element, EventArgs.Empty); 
                    }
                    break;
                case XObjectChange.Name:
                    e = sender as XElement; 
                    if (e != null) {
                        if (value.element == e.parent && value.name == e.Name && value.element.Element(value.name) == e) { 
                            OnValueChanged(value.element, EventArgs.Empty); 
                        }
                        else if (changeState == e) { 
                            changeState = null;
                            OnValueChanged(value.element, EventArgs.Empty);
                        }
                    } 
                    break;
            } 
        } 

        protected override void OnChanging(object sender, XObjectChangeEventArgs args) { 
            if (value == null) return;
            switch (args.ObjectChange) {
                case XObjectChange.Remove:
                case XObjectChange.Name: 
                    XElement e = sender as XElement;
                    changeState = e != null && value.element == e.parent && value.name == e.Name && value.element.Element(value.name) == e ? e : null; 
                    break; 
            }
        } 
    }

    class XElementElementsPropertyDescriptor : XPropertyDescriptor>
    { 
        XDeferredAxis value;
        object changeState; 
 
        public XElementElementsPropertyDescriptor() : base("Elements") {
        } 

        public override object GetValue(object component) {
            return value = new XDeferredAxis((e, n) => n != null ? e.Elements(n) : e.Elements(), component as XElement, null);
        } 

        protected override void OnChanged(object sender, XObjectChangeEventArgs args) { 
            if (value == null) return; 
            switch (args.ObjectChange) {
                case XObjectChange.Add: 
                    XElement e = sender as XElement;
                    if (e != null && value.element == e.parent && (value.name == e.Name || value.name == null)) {
                        OnValueChanged(value.element, EventArgs.Empty);
                    } 
                    break;
                case XObjectChange.Remove: 
                    e = sender as XElement; 
                    if (e != null && value.element == (changeState as XContainer) && (value.name == e.Name || value.name == null)) {
                        changeState = null; 
                        OnValueChanged(value.element, EventArgs.Empty);
                    }
                    break;
                case XObjectChange.Name: 
                    e = sender as XElement;
                    if (e != null && value.element == e.parent && value.name != null && (value.name == e.Name || value.name == (changeState as XName))) { 
                        changeState = null; 
                        OnValueChanged(value.element, EventArgs.Empty);
                    } 
                    break;
            }
        }
 
        protected override void OnChanging(object sender, XObjectChangeEventArgs args) {
            if (value == null) return; 
            switch (args.ObjectChange) { 
                case XObjectChange.Remove:
                    XElement e = sender as XElement; 
                    changeState = e != null ? e.parent : null;
                    break;
                case XObjectChange.Name:
                    e = sender as XElement; 
                    changeState = e != null ? e.Name : null;
                    break; 
            } 
        }
    } 

    class XElementValuePropertyDescriptor : XPropertyDescriptor
    {
        XElement element; 

        public XElementValuePropertyDescriptor() : base("Value") { 
        } 

        public override bool IsReadOnly { 
            get { return false; }
        }

        public override object GetValue(object component) { 
            element = component as XElement;
            if (element == null) return string.Empty; 
            return element.Value; 
        }
 
        public override void SetValue(object component, object value) {
            element = component as XElement;
            if (element == null) return;
            element.Value = value as string; 
        }
 
        protected override void OnChanged(object sender, XObjectChangeEventArgs args) { 
            if (element == null) return;
            switch (args.ObjectChange) { 
                case XObjectChange.Add:
                case XObjectChange.Remove:
                    if (sender is XElement || sender is XText) {
                        OnValueChanged(element, EventArgs.Empty); 
                    }
                    break; 
                case XObjectChange.Value: 
                    if (sender is XText) {
                        OnValueChanged(element, EventArgs.Empty); 
                    }
                    break;
            }
        } 
    }
 
    class XElementXmlPropertyDescriptor : XPropertyDescriptor 
    {
        XElement element; 

        public XElementXmlPropertyDescriptor() : base("Xml") {
        }
 
        public override object GetValue(object component) {
            element = component as XElement; 
            if (element == null) return string.Empty; 
            return element.ToString(SaveOptions.DisableFormatting);
        } 

        protected override void OnChanged(object sender, XObjectChangeEventArgs args) {
            if (element == null) return;
            OnValueChanged(element, EventArgs.Empty); 
        }
    } 
 
    class XAttributeValuePropertyDescriptor : XPropertyDescriptor
    { 
        XAttribute attribute;

        public XAttributeValuePropertyDescriptor() : base("Value") {
        } 

        public override bool IsReadOnly { 
            get { return false; } 
        }
 
        public override object GetValue(object component) {
            attribute = component as XAttribute;
            if (attribute == null) return string.Empty;
            return attribute.Value; 
        }
 
        public override void SetValue(object component, object value) { 
            attribute = component as XAttribute;
            if (attribute == null) return; 
            attribute.Value = value as string;
        }

        protected override void OnChanged(object sender, XObjectChangeEventArgs args) { 
            if (attribute == null) return;
            if (args.ObjectChange == XObjectChange.Value) { 
                OnValueChanged(attribute, EventArgs.Empty); 
            }
        } 
    }

    class XDeferredAxis : IEnumerable, IEnumerable where T : XObject
    { 
        Func> func;
        internal XElement element; 
        internal XName name; 

        public XDeferredAxis(Func> func, XElement element, XName name) { 
            if (func == null) throw new ArgumentNullException("func");
            if (element == null) throw new ArgumentNullException("element");
            this.func = func;
            this.element = element; 
            this.name = name;
        } 
 
        public IEnumerator GetEnumerator() {
            return func(element, name).GetEnumerator(); 
        }

        IEnumerator IEnumerable.GetEnumerator() {
            return GetEnumerator(); 
        }
 
        public IEnumerable this[string expandedName] { 
            get {
                if (expandedName == null) throw new ArgumentNullException("expandedName"); 
                if (name == null) {
                    name = expandedName;
                }
                else if (name != expandedName) { 
                    return Enumerable.Empty();
                } 
                return this; 
            }
        } 
    }

    class XDeferredSingleton where T : XObject
    { 
        Func func;
        internal XElement element; 
        internal XName name; 

        public XDeferredSingleton(Func func, XElement element, XName name) { 
            if (func == null) throw new ArgumentNullException("func");
            if (element == null) throw new ArgumentNullException("element");
            this.func = func;
            this.element = element; 
            this.name = name;
        } 
 
        public T this[string expandedName] {
            get { 
                if (expandedName == null) throw new ArgumentNullException("expandedName");
                if (name == null) {
                    name = expandedName;
                } 
                else if (name != expandedName) {
                    return null; 
                } 
                return func(element, name);
            } 
        }
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

                        

                        

                        
                        

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