/// <summary>
/// The method which will be called for the attached dependency property when the new element is added to a fake collection.
/// </summary>
/// <param name="dependencyObject">The target FrameworkElement.</param>
/// <param name="item">The new object to add.</param>
public static void ProcessAddPropertyChangeEventItems(DependencyObject dependencyObject, object item)
{
if ((item == null) || (dependencyObject == null))
{
return;
}
if (BindHelper.IsInDesignModeStatic)
{
// Cannot correctly set in the design mode.
return;
}
if (BindHelper.IsInDesignModeStatic)
{
// Cannot correctly set in the design mode.
return;
}
BindEventHandler bindItem = item as BindEventHandler;
if (bindItem == null)
{
throw new ArgumentException("AddPropertyChangeEvents accepts only BindEventHandlers Type instances ");
}
if (String.IsNullOrEmpty(bindItem.TargetPropertyName))
{
throw new ArgumentException("AddPropertyChangeEvents accepts only BindEventHandlers with set TargetPropertyName");
}
var listenDependencyProp = BindHelper.LocateDependencyProperty(bindItem.TargetPropertyName, dependencyObject);
if (listenDependencyProp == null)
{
throw new ArgumentException("AddPropertyChangeEvents cannot obtain proper Type of TargetPropertyName = " + bindItem.TargetPropertyName);
}
DependencyPropertyDescriptor dependencyPropertyDescriptor = DependencyPropertyDescriptor.FromProperty(listenDependencyProp, listenDependencyProp.OwnerType);
if (dependencyPropertyDescriptor == null)
{
throw new ArgumentException("AddPropertyChangeEvents cannot obtain proper Descriptor of TargetPropertyName = " + bindItem.TargetPropertyName);
}
var methodInfo = BindHelper.GetMethodInfo(bindItem.Source.GetType(), bindItem.MethodName);
Type desiredDelegateType = typeof(EventHandler);
var result = methodInfo.CreateDelegate(desiredDelegateType, bindItem.Source);
if (result != null)
{
dependencyPropertyDescriptor.AddValueChanged(dependencyObject, (EventHandler)result);
}
}
