System.Windows.Data.BindingExpressionBase.PropertyPathValueChanged C# (CSharp) Метод

		void PropertyPathValueChanged (object o, EventArgs EventArgs)
		{
			string dataError = null;
			Exception exception = null;
			// If we detach the binding, we set the Source of the PropertyPathWalker to null
			// and emit a ValueChanged event which tries to update the target. We need to ignore this.
			if (!Attached)
				return;

			var node = PropertyPathWalker.FinalNode;
			AttachToNotifyError (node.Source as INotifyDataErrorInfo);

			if (!Updating && Binding.ValidatesOnDataErrors && node.Source is IDataErrorInfo && node.PropertyInfo != null)
				dataError = ((IDataErrorInfo) node.Source) [node.PropertyInfo.Name];
			bool oldUpdating = Updating;
			try {
				Updating = true;
				Invalidate ();
				Target.SetValueImpl (Property, this);
			} catch (Exception ex) {
				if (Binding.ValidatesOnExceptions) {
					if (ex is TargetInvocationException)
						ex = ex.InnerException;
					exception = ex;
				}
			}
			finally {
				Updating = oldUpdating;
			}

			MaybeEmitError (dataError, exception);
		}