private static string NativeBindingTest(int count) { var target = new TestModel(); var model = new BindingPerformanceModel(target); target.BindingContext = model; var binding = new Xamarin.Forms.Binding("Property", BindingMode.TwoWay); target.SetBinding(TestModel.ValueProperty, binding); Stopwatch startNew = Stopwatch.StartNew(); for (int i = 0; i < count; i++) target.Value = i % 2 == 0 ? "0" : "1"; startNew.Stop(); if (model.SetCount != count) throw new Exception(); return startNew.Elapsed.ToString(); }
private static string NativeBindingTest(int count) { var target = new TestModel(); var model = new BindingPerformanceModel(target); target.BindingContext = model; var binding = new Xamarin.Forms.Binding("Property", BindingMode.TwoWay); target.SetBinding(TestModel.ValueProperty, binding); Stopwatch startNew = Stopwatch.StartNew(); for (int i = 0; i < count; i++) { target.Value = i % 2 == 0 ? "0" : "1"; } startNew.Stop(); if (model.SetCount != count) { throw new Exception(); } return(startNew.Elapsed.ToString()); }
/// <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; object previous = null; BindingExpressionPart part = null; for (var i = 0; i < _parts.Count; i++) { part = _parts[i]; bool isLast = i + 1 == _parts.Count; if (!part.IsSelf && current != null) { // Allow the object instance itself to provide its own TypeInfo var reflectable = current as IReflectableType; TypeInfo currentType = reflectable != null?reflectable.GetTypeInfo() : current.GetType().GetTypeInfo(); if (part.LastGetter == null || !part.LastGetter.DeclaringType.GetTypeInfo().IsAssignableFrom(currentType)) { SetupPart(currentType, part); } if (!isLast) { part.TryGetValue(current, out current); } } if (!part.IsSelf && current != null) { if ((needsGetter && part.LastGetter == null) || (needsSetter && part.NextPart == null && part.LastSetter == null)) { Log.Warning("Binding", PropertyNotFoundErrorMessage, part.Content, current, target.GetType(), property.PropertyName); break; } } if (mode == BindingMode.OneWay || mode == BindingMode.TwoWay) { var inpc = current as INotifyPropertyChanged; if (inpc != null && !ReferenceEquals(current, previous)) { part.Subscribe(inpc); } } previous = current; } Debug.Assert(part != null, "There should always be at least the self part in the expression."); if (needsGetter) { object value = property.DefaultValue; if (part.TryGetValue(current, out value) || part.IsSelf) { value = Binding.GetSourceValue(value, property.ReturnType); } else { value = Binding.FallbackValue ?? property.DefaultValue; } if (!TryConvert(part, ref value, 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(part, ref value, 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); } }