/// <summary> /// Applies the binding expression to a previously set source or target. /// </summary> void ApplyCore(object sourceObject, BindableObject target, BindableProperty property, bool fromTarget = false) { BindingMode mode = Binding.GetRealizedMode(_targetProperty); if ((mode == BindingMode.OneWay || mode == BindingMode.OneTime) && fromTarget) { return; } bool needsGetter = (mode == BindingMode.TwoWay && !fromTarget) || mode == BindingMode.OneWay || mode == BindingMode.OneTime; bool needsSetter = !needsGetter && ((mode == BindingMode.TwoWay && fromTarget) || mode == BindingMode.OneWayToSource); object current = sourceObject; BindingExpressionPart part = null; for (var i = 0; i < _parts.Count; i++) { part = _parts[i]; if (!part.IsSelf && current != null) { // Allow the object instance itself to provide its own TypeInfo TypeInfo currentType = current is IReflectableType reflectable?reflectable.GetTypeInfo() : current.GetType().GetTypeInfo(); if (part.LastGetter == null || !part.LastGetter.DeclaringType.GetTypeInfo().IsAssignableFrom(currentType)) { SetupPart(currentType, part); } if (i < _parts.Count - 1) { part.TryGetValue(current, out current); } } if (!part.IsSelf && current != null && ((needsGetter && part.LastGetter == null) || (needsSetter && part.NextPart == null && part.LastSetter == null))) { Log.Warning("Binding", PropertyNotFoundErrorMessage, part.Content, current, target.GetType(), property.PropertyName); break; } if (part.NextPart != null && (mode == BindingMode.OneWay || mode == BindingMode.TwoWay) && current is INotifyPropertyChanged inpc) { part.Subscribe(inpc); } } Debug.Assert(part != null, "There should always be at least the self part in the expression."); if (needsGetter) { if (part.TryGetValue(current, out object value) || part.IsSelf) { value = Binding.GetSourceValue(value, property.ReturnType); } else { value = Binding.FallbackValue ?? property.GetDefaultValue(target); } if (!TryConvert(ref value, property, property.ReturnType, true)) { Log.Warning("Binding", "{0} can not be converted to type '{1}'", value, property.ReturnType); return; } target.SetValueCore(property, value, SetValueFlags.ClearDynamicResource, BindableObject.SetValuePrivateFlags.Default | BindableObject.SetValuePrivateFlags.Converted); } else if (needsSetter && part.LastSetter != null && current != null) { object value = Binding.GetTargetValue(target.GetValue(property), part.SetterType); if (!TryConvert(ref value, property, part.SetterType, false)) { Log.Warning("Binding", "{0} can not be converted to type '{1}'", value, part.SetterType); return; } object[] args; if (part.IsIndexer) { args = new object[part.Arguments.Length + 1]; part.Arguments.CopyTo(args, 0); args[args.Length - 1] = value; } else if (part.IsBindablePropertySetter) { args = new[] { part.BindablePropertyField, value }; } else { args = new[] { value }; } part.LastSetter.Invoke(current, args); } }
static void SetValueFromRenderer(BindableObject bindable, BindableProperty property, object value) { bindable.SetValueCore(property, value); }