.NET では、System.ComponentModel.ICustomTypeDescriptor を実装することにより、クラスの構造を動的に変更できます。ほとんどのシリアライザーは、このインターフェイスをサポートしています。
// Sample Serialization
foreach(PropertyDescriptor p in TypeDescriptor.GetProperties(obj)){
string name = p.PropertyName;
object value = p.GetValue(obj);
}
内部的に TypeDescriptor は Reflection を使用しますが、実装により、リフレクション属性を簡単にオーバーライドできます。
実装の 3 つのステップを次に示します。
// Implement System.ComponentModel.ICustomTypeDescriptor Interface on
// your Entity
public class MyEntity: System.ComponentModel.ICustomTypeDescriptor
{
....
// most methods needs only call to default implementation as shown below
System.ComponentModel.AttributeCollection
System.ComponentModel.ICustomTypeDescriptor.GetAttributes()
{
return TypeDescriptor.GetAttributes(this, true);
}
string System.ComponentModel.ICustomTypeDescriptor.GetClassName()
{
return TypeDescriptor.GetClassName(this, true);
}
string System.ComponentModel.ICustomTypeDescriptor.GetComponentName()
{
return TypeDescriptor.GetComponentName(this, true);
}
System.ComponentModel.TypeConverter System.ComponentModel.ICustomTypeDescriptor.GetConverter()
{
return TypeDescriptor.GetConverter(this, true);
}
System.ComponentModel.EventDescriptor System.ComponentModel.ICustomTypeDescriptor.GetDefaultEvent()
{
return TypeDescriptor.GetDefaultEvent(this, true);
}
System.ComponentModel.PropertyDescriptor System.ComponentModel.ICustomTypeDescriptor.GetDefaultProperty()
{
return TypeDescriptor.GetDefaultProperty(this, true);
}
object System.ComponentModel.ICustomTypeDescriptor.GetEditor(Type editorBaseType)
{
return TypeDescriptor.GetEditor(this, editorBaseType, true);
}
System.ComponentModel.EventDescriptorCollection System.ComponentModel.ICustomTypeDescriptor.GetEvents(Attribute[] attributes)
{
return TypeDescriptor.GetEvents(this, attributes, true);
}
System.ComponentModel.EventDescriptorCollection System.ComponentModel.ICustomTypeDescriptor.GetEvents()
{
return TypeDescriptor.GetEvents(this, true);
}
System.ComponentModel.PropertyDescriptorCollection System.ComponentModel.ICustomTypeDescriptor.GetProperties(Attribute[] attributes)
{
return TypeDescriptor.GetProperties(this, attributes, true);
}
object System.ComponentModel.ICustomTypeDescriptor.GetPropertyOwner(System.ComponentModel.PropertyDescriptor pd)
{
return this;
}
// The Only method that needs different implementation is below
System.ComponentModel.PropertyDescriptorCollection
System.ComponentModel.ICustomTypeDescriptor.GetProperties()
{
// ... you are supposed to create new instance of
// PropertyDescriptorCollection with PropertyDescriptor
PropertyDescriptorCollection pdc = new PropertyDescriptorCollection();
foreach(PropertyDescriptor p in TypeDescriptor.GetProperties(this,true)){
// if readonly..
AtomPropertyDescriptor ap = new AtomPropertyDescriptor(p, p.Name);
// or
AtomPropertyDescriptor ap = new AtomPropertyDescriptor(p, p.Name,
true,
new XmlIgnoreAttribute(),
new ScriptIgnoreAttribute(),
new ReadOnlyAttribute());
pdc.Add(ap);
}
return pdc;
}
}
// And here is the AtomPropertyDescriptorClass
public class AtomPropertyDescriptor : PropertyDescriptor
{
PropertyDescriptor desc;
bool? readOnly = null;
public AtomPropertyDescriptor(PropertyDescriptor pd, string name,
bool? readOnly, params Attribute[] attrs) :
base(name, attrs)
{
desc = pd;
this.readOnly = readOnly;
}
public override bool CanResetValue(object component)
{
return desc.CanResetValue(component);
}
public override Type ComponentType
{
get
{
return desc.ComponentType;
}
}
public override object GetValue(object component)
{
return desc.GetValue(component);
}
public override bool IsReadOnly
{
get
{
if (readOnly.HasValue)
return readOnly.Value;
return desc.IsReadOnly;
}
}
public override Type PropertyType
{
get { return desc.PropertyType; }
}
public override void ResetValue(object component)
{
desc.ResetValue(component);
}
public override void SetValue(object component, object value)
{
desc.SetValue(component, value);
}
public override bool ShouldSerializeValue(object component)
{
return desc.ShouldSerializeValue(component);
}
}