스빅은 답변에 정확합니다. XElement에 대한 CustomDescriptor (XElement의 TypeDescriptionProviderAttribute 존재 여부에 따라 결정됨)는 사용자 정의 PropertyDescriptor에 이름 요소 ElementsBuilder를 제공하며 이는 IEnumerable <XElement>을 반환합니다. 인덱서에 의한 바인딩 경로에서이 작업이 수행되면 XContainer.Elements (XName)가 반환되고 그렇지 않으면 XContainer.Elements()가 반환됩니다. 속성이 작동하지 않는 이유는 제공된 동적 속성 설명자가 없다는 것입니다.
아래 코드는 동적 요소 속성과 비슷한 방식으로이 누락 된 기능과 노드 속성을 제공합니다.
//Add this code in App start up
TypeDescriptor.AddProvider(new XElementAdditionalDynamicPropertiesTypeDescriptionProvider(),
typeof(XElement));
아래 클래스는 기능을 제공하며이 코드는 Elements의 작동 방식과 유사합니다.
public class XDeferredAxis : IEnumerable<XAttribute>
{
internal XElement element;
private Func<XElement, XName, IEnumerable<XAttribute>> func;
private XName name;
public IEnumerator<XAttribute> GetEnumerator()
{
return this.func(this.element, this.name).GetEnumerator();
}
public XDeferredAxis(Func<XElement, XName, IEnumerable<XAttribute>> 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;
}
IEnumerator IEnumerable.GetEnumerator()
{
return this.GetEnumerator();
}
}
public class XElementNodesPropertyDescriptor : PropertyDescriptor
{
private XElement element;
private bool childRemoved;
public XElementNodesPropertyDescriptor() : base("Nodes", null)
{
}
public override void AddValueChanged(object component, EventHandler handler)
{
bool flag = base.GetValueChangedHandler(component) != null;
base.AddValueChanged(component, handler);
if (!flag)
{
XElement local = component as XElement;
if ((local != null) && (base.GetValueChangedHandler(component) != null))
{
element = local;
local.Changing += new EventHandler<XObjectChangeEventArgs>(this.OnChanging);
local.Changed += new EventHandler<XObjectChangeEventArgs>(this.OnChanged);
}
}
}
private void OnChanging(object sender, XObjectChangeEventArgs e)
{
childRemoved = false;
if (e.ObjectChange == XObjectChange.Remove)
{
XObject senderNode = (XObject)sender;
if (senderNode.Parent == element)
{
childRemoved = true;
}
}
}
private void OnChanged(object sender, XObjectChangeEventArgs e)
{
XObject senderNode = (XObject)sender;
switch (e.ObjectChange)
{
case XObjectChange.Add:
case XObjectChange.Value:
case XObjectChange.Name:
if (senderNode.Parent == element)
{
this.OnValueChanged(element, EventArgs.Empty);
}
break;
case XObjectChange.Remove:
if (childRemoved)
{
this.OnValueChanged(element, EventArgs.Empty);
}
break;
}
}
public override void RemoveValueChanged(object component, EventHandler handler)
{
base.RemoveValueChanged(component, handler);
XElement local = component as XElement;
if ((local != null) && (base.GetValueChangedHandler(component) == null))
{
local.Changed -= new EventHandler<XObjectChangeEventArgs>(this.OnChanged);
}
}
public override bool SupportsChangeEvents
{
get
{
return true;
}
}
public override Type ComponentType
{
get
{
return typeof(XElement);
}
}
public override bool IsReadOnly
{
get
{
return true;
}
}
public override Type PropertyType
{
get
{
return typeof(IEnumerable<XNode>);
}
}
public override bool CanResetValue(object component)
{
return false;
}
public override object GetValue(object component)
{
var nodes= (component as XElement).Nodes();
return nodes;
}
public override void ResetValue(object component)
{
}
public override void SetValue(object component, object value)
{
}
public override bool ShouldSerializeValue(object component)
{
return false;
}
}
public class XElementAttributesPropertyDescriptor : PropertyDescriptor
{
private XDeferredAxis value;
private bool removalIsOwnAttribute;
public XElementAttributesPropertyDescriptor() : base("Attributes", null) {
}
public override void AddValueChanged(object component, EventHandler handler)
{
bool flag = base.GetValueChangedHandler(component) != null;
base.AddValueChanged(component, handler);
if (!flag)
{
XElement local = component as XElement;
if ((local != null) && (base.GetValueChangedHandler(component) != null))
{
local.Changing += new EventHandler<XObjectChangeEventArgs>(this.OnChanging);
local.Changed += new EventHandler<XObjectChangeEventArgs>(this.OnChanged);
}
}
}
private void OnChanging(object sender, XObjectChangeEventArgs e)
{
removalIsOwnAttribute = false;
if (e.ObjectChange == XObjectChange.Remove)
{
var xAttribute = sender as XAttribute;
if (xAttribute != null && xAttribute.Parent == value.element)
{
removalIsOwnAttribute = true;
}
}
}
private void OnChanged(object sender, XObjectChangeEventArgs e)
{
var changeRequired = false;
var xAttribute = sender as XAttribute;
if (xAttribute != null)
{
switch (e.ObjectChange)
{
case XObjectChange.Name:
case XObjectChange.Add:
if (xAttribute.Parent == value.element)
{
changeRequired = true;
}
break;
case XObjectChange.Remove:
changeRequired = removalIsOwnAttribute;
break;
}
if (changeRequired)
{
this.OnValueChanged(value.element, EventArgs.Empty);
}
}
}
public override void RemoveValueChanged(object component, EventHandler handler)
{
base.RemoveValueChanged(component, handler);
XElement local = component as XElement;
if ((local != null) && (base.GetValueChangedHandler(component) == null))
{
local.Changed -= new EventHandler<XObjectChangeEventArgs>(this.OnChanged);
}
}
public override bool SupportsChangeEvents
{
get
{
return true;
}
}
public override Type ComponentType
{
get
{
return typeof(XElement);
}
}
public override bool IsReadOnly
{
get
{
return true;
}
}
public override Type PropertyType
{
get
{
return typeof(IEnumerable<XAttribute>);
}
}
public override bool CanResetValue(object component)
{
return false;
}
public override object GetValue(object component)
{
return (object)(this.value = new XDeferredAxis((Func<XElement, XName, IEnumerable<XAttribute>>)((e, n) =>
{
if (!(n != (XName)null))
return e.Attributes();
return e.Attributes(n);
}), component as XElement, (XName)null));
}
public override void ResetValue(object component)
{
}
public override void SetValue(object component, object value)
{
}
public override bool ShouldSerializeValue(object component)
{
return false;
}
}
public class XElementAdditionalDynamicPropertiesTypeDescriptionProvider: TypeDescriptionProvider
{
public XElementAdditionalDynamicPropertiesTypeDescriptionProvider() : this(TypeDescriptor.GetProvider(typeof(XElement))) { }
protected XElementAdditionalDynamicPropertiesTypeDescriptionProvider(TypeDescriptionProvider parent) : base(parent) { }
public override ICustomTypeDescriptor GetTypeDescriptor(Type objectType, object instance)
{
var baseTypeDescriptor= base.GetTypeDescriptor(objectType, instance);
return new XElementAdditionalDynamicPropertiesTypeDescriptor(baseTypeDescriptor);
}
}
public class XElementAdditionalDynamicPropertiesTypeDescriptor : CustomTypeDescriptor
{
public XElementAdditionalDynamicPropertiesTypeDescriptor(ICustomTypeDescriptor original) : base(original) { }
public override PropertyDescriptorCollection GetProperties()
{
return GetProperties(null);
}
public override PropertyDescriptorCollection GetProperties(Attribute[] attributes)
{
PropertyDescriptorCollection descriptors = new PropertyDescriptorCollection(null);
if (attributes == null)
{
descriptors.Add(new XElementAttributesPropertyDescriptor());
descriptors.Add(new XElementNodesPropertyDescriptor());
}
foreach (PropertyDescriptor pd in base.GetProperties(attributes))
{
descriptors.Add(pd);
}
return descriptors;
}
}
감사합니다. 내 질문에 대한 답변입니다. 다시 한 번 감사드립니다! –