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涉及的数据类型和自定义控件:

我已经定义了我自己的类型,它是一个"IList bool",并且有它自己的索引器。该类存储是否在某一天重复某事,即如果Data[2] 为真,则暗示应在星期三重复某事。以下是部分代码

 public class WeeklyDayPresence : INotifyCollectionChanged, IList<bool>, ISerializable
        {
            private List<bool> Data { get; set; }
            public bool this[int index]
            {
                get => Data[index];
                set
                {
                    bool temp = Data[index];
                    Data[index] = value;
                    CollectionChanged?.Invoke(this,new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Replace,value,temp,index));
                }
            }
         }

现在,我打算有一个选择系统,允许用户打开或关闭绑定到某一天的按钮,这样他们就可以选择哪些日子应该是真或假。

因此,我创建了一个控件(“DayOfWeekSelector”),它本质上是 7 个非常相似的自定义按钮的堆栈布局。这是自定义按钮的代码:

public class DayOfWeekButton : Button
    {
        public static readonly BindableProperty SelectedProperty =
            BindableProperty.Create("Selected", typeof(bool), typeof(bool), false);

        public bool Selected
        {
            get => (bool) GetValue(SelectedProperty);
            set
            {
                SetValue(SelectedProperty, value);
                RefreshColours();
            }
        }

        public DayOfWeekButton()
        {
            RefreshColours();
            Clicked += DayOfWeekButton_Clicked;
        }

        private void DayOfWeekButton_Clicked(object sender, EventArgs e)
        {
            Selected = !Selected;
        }
    }

在我的 DayOfWeekSelector 中,我传入了一个“具有”WeeklyDayPresence 的对象:

public class EventOccurrenceRepeater : NotifyModel, ISerializable
    {
        private WeeklyDayPresence _repeatOnDay;
        public WeeklyDayPresence RepeatOnDay
        {
            get => _repeatOnDay;
            set => SetValue(ref _repeatOnDay, value);
        }
     }

问题:

当我尝试将值绑定到 Button 时,我收到一个System.Reflection.TargetParameterCountException

private void AddButton(string text, int ID)
        {
            var button = new DayOfWeekButton {Text = text};
            var binding = new Binding($"RepeatOnDay[{ID}]", BindingMode.TwoWay);
            button.SetBinding(DayOfWeekButton.SelectedProperty, binding);
            button.BindingContext = Repeater; // Throws Exception after this
            //...
        }

那是什么异常,为什么我会得到它?如果有帮助,我已附加到堆栈跟踪的链接

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0 回答 0