Windows8获取错误“检测到布局周期。布局无法完成​​。”触摸自定义控制日期选择器

Question

我使用C＃和Xaml为日期选择器和Wndows8 App创建了一个自定义控件。当我使用鼠标扩展comboBox的日期或月份或年份时，当我使用触摸屏并单击控件时工作正常，然后它一直崩溃，让我“检测到布局周期。布局无法完成​​。”错误。我该怎么做才能消除这个错误？ 自定义控制代码：

XAML代码：

 <UserControl
    x:Class="Win8.MainApp.User_Control.DatePicker"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:Win8.MainApp.User_Control"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    DataContext="{Binding RelativeSource={RelativeSource Self}}"
    mc:Ignorable="d"
    d:DesignHeight="300"
    d:DesignWidth="400">
    <UserControl.Resources>
        <DataTemplate x:Key="DateTemplate">
            <TextBlock Text="{Binding}" FontWeight="Light" FontFamily="Segoe UI" FontSize="24" HorizontalAlignment="Left" Margin="9,2,0,0" VerticalAlignment="Center"/>
            <!--<ComboBoxItem Content="{Binding}" FontWeight="Light" FontSize="24" HorizontalAlignment="Left" VerticalAlignment="Center"/>-->
        </DataTemplate>
    </UserControl.Resources>
        <Grid Width="370">
            <StackPanel Orientation="Horizontal">
            <ComboBox ScrollViewer.VerticalScrollBarVisibility="Hidden" ItemTemplate="{StaticResource DateTemplate}" ItemsSource="{Binding Date.Day}"  Width="100" Height="30" MaxDropDownHeight="1" SelectedItem="{Binding Day, Mode=TwoWay}"/>
            <ComboBox ScrollViewer.VerticalScrollBarVisibility="Hidden" Margin="20,0,0,0" ItemTemplate="{StaticResource DateTemplate}" ItemsSource="{Binding Date.Month}"  Width="100" Height="30" MaxDropDownHeight="1" SelectedItem="{Binding Month, Mode=TwoWay}" />
            <ComboBox ScrollViewer.VerticalScrollBarVisibility="Hidden" Margin="20,0,0,0" ItemTemplate="{StaticResource DateTemplate}" ItemsSource="{Binding Date.Year}"  Width="120" Height="30" MaxDropDownHeight="1" SelectedItem="{Binding Year, Mode=TwoWay}"/>
            </StackPanel>
    </Grid>
</UserControl>

.Cs Code

 public sealed partial class DatePicker : UserControl, INotifyPropertyChanged
{
    private int _day;
    private int _month;
    private int _year;
    private Date _date = new Date();

    public int Day
    {
        get { return _day; }
        set
        {
            if (_day == value) return;
            _day = value;
            NotifyPropertyChanged("Day");
        }
    }

    public int Month
    {
        get { return _month; }
        set
        {
            if (_month == value) return;
            _month = value;
            _date.Day =
                new ObservableCollection<int>((Enumerable.Range(1, DateTime.DaysInMonth(DateTime.Now.Year, _month))));
            NotifyPropertyChanged("Month");
        }
    }

    public int Year
    {
        get { return _year; }
        set
        {
            if (_year == value) return;
            _year = value;
            _date.Day = new ObservableCollection<int>((Enumerable.Range(1, DateTime.DaysInMonth(_year, _month))));
            NotifyPropertyChanged("Year");
        }
    }

    public Date Date
    {
        get { return _date; }
    }

    private int GetDaysInMonth(int year, int month)
    {
        return DateTime.DaysInMonth(year, month);
    }

    public DatePicker()
    {
        this.InitializeComponent();
        SetTodaysDate();
        SetDataSource();
    }

    private void SetTodaysDate()
    {
        Day = DateTime.Now.Day;
        Month = DateTime.Now.Month;
        Year = DateTime.Now.Year;
    }

    private void SetDataSource()
    {
        int year = DateTime.Now.Year - 10;
        _date.Day = new ObservableCollection<int>(Enumerable.Range(1, GetDaysInMonth(Year, Month)));
        _date.Month = new ObservableCollection<int>(Enumerable.Range(1, 12));
        _date.Year = new ObservableCollection<int>(Enumerable.Range(year, 20));
    }

    public event PropertyChangedEventHandler PropertyChanged;
    private void NotifyPropertyChanged(String info)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(info));
        }
    }
}

public class Date : INotifyPropertyChanged
{
    private ObservableCollection<int> _day;
    private ObservableCollection<int> _month;
    private ObservableCollection<int> _year;

    public ObservableCollection<int> Day
    {
        get { return _day; }
        set
        {
            if (_day == value) return;
            _day = value;
            NotifyPropertyChanged("Day");
        }
    }

    public ObservableCollection<int> Month
    {
        get { return _month; }
        set
        {
            if (_month == value) return;
            _month = value;
            NotifyPropertyChanged("Month");
        }
    }

    public ObservableCollection<int> Year
    {
        get { return _year; }
        set
        {
            if (_year == value) return;
            _year = value;
            NotifyPropertyChanged("Year");
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    private void NotifyPropertyChanged(String info)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(info));
        }
    }
}

Answer 1

找到！

我在WinRT上遇到了完全相同的问题并找到了解决方法：需要删除“MaxDropDownHeight”属性。一旦分配了此属性，无论该值如何，都会在触摸设备上引起此问题。

尝试在代码中删除它： - ）。