问WrapPanel ItemWidth & ItemHeight MultiBinding

EN

我只想将MultiBinding用于WrapPanel的ItemHeight & ItemWidth。代码如下：

<Window.Resources>
    <local:SensorHeightCalculator x:Key="HeightCalculator"/>
    <local:SensorWidthCalculator x:Key="WidthCalculator"/>
</Window.Resources>

<Border x:Name="sensorPanelBorder" BorderBrush="#FFD5DFE5" BorderThickness="1" Grid.Column="2" Margin="0,9,2,2" CornerRadius="3">
    <ListView x:Name="sensorPanel" Margin="0" ItemsSource="{Binding Source={StaticResource SensorControls}}">
        <ListView.ItemsPanel>
            <ItemsPanelTemplate>
                <WrapPanel x:Name="sensorWrapPanel" IsItemsHost="True">
                    <WrapPanel.ItemHeight>
                        <MultiBinding Converter="{StaticResource HeightCalculator}" UpdateSourceTrigger="PropertyChanged">
                            <Binding ElementName="sensorPanelBorder" Path="ActualHeight"/>
                            <Binding ElementName="sensorPanelBorder" Path="ActualWidth"/>
                            <Binding ElementName="sensorPanel" Path="Items.Count"/>
                        </MultiBinding>
                    </WrapPanel.ItemHeight>
                </WrapPanel>
            </ItemsPanelTemplate>
        </ListView.ItemsPanel>
    </ListView>
</Border>

但它会抛出异常，而不会呈现。我也试图在代码隐藏中这样做，但这也不起作用。

实际的问题是，我需要将WrapPanel的项绑定到CollectionViewSource，因此，当我在线阅读时，我必须在ListView中使用WrapPanel (如上面所示)。在此之前，我手动填充了WrapPanel --我有一个方法，用于计算WrapPanel的ItemHeight和ItemWidth并分配给它。但是现在WrapPanel在ListView中，它在代码隐藏中是不可访问的，因此我决定使用Multibinding。

SensorHeightCalculator的来源：

public class SensorHeightCalculator : IMultiValueConverter
    {
        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
        {
            double H = (double)values[0];
            double W = (double)values[1];
            double N = (double)values[2];
            if (N > 0)
            {
                double k = 7.0 / 6.0;
                double c = N;
                double r = 1;
                double ah, aw, a, b;
                do
                {
                    aw = (W - 2) / c;
                    ah = k * aw;
                    if (Math.Floor(H / ah) <= r) break;
                    else
                    {
                        r++;
                        c = c - Math.Floor(c / r);
                    }
                } while (r <= N);
                a = Math.Min(aw, H / (k * r));
                b = k * a;
                return b - 10;
            }
            else
                return 300;
        }

        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
        {
            return default(object[]);
        }
    }

异常和完整堆栈跟踪：

例外情况: InvalidCastException:指定的强制转换无效。

堆栈跟踪：

在System.Windows.Data.MultiBindingExpression.TransferValue() at System.Windows.Data.MultiBindingExpression.Transfer() at System.Windows.Data.MultiBindingExpression.UpdateTarget(Boolean includeInnerBindings) at System.Windows.Data.MultiBindingExpression.AttachToContext(Boolean lastChance)的AvaPa.SensorHeightCalculator.Convert(Object[]值，类型targetType、对象参数、CultureInfo区域性)( System.Windows.Data.MultiBindingExpression.AttachOverride(DependencyObject d )，DependencyProperty dp( System.Windows.Data.BindingExpressionBase.OnAttach(DependencyObject d )，( System.Windows.StyleHelper.GetInstanceValue(UncommonField1 dataField, DependencyObject container, FrameworkElement feChild, FrameworkContentElement fceChild, Int32 childIndex, DependencyProperty dp, Int32 i, EffectiveValueEntry& entry) at System.Windows.StyleHelper.GetChildValueHelper(UncommonField1 dataField，ItemStructList1& valueLookupList, DependencyProperty dp, DependencyObject container, FrameworkObject child, Int32 childIndex, Boolean styleLookup, EffectiveValueEntry& entry, ValueLookupType& sourceType, FrameworkElementFactory templateRoot) at System.Windows.StyleHelper.GetChildValue(UncommonField1 dataField，DependencyObject容器，Int32 childIndex，FrameworkObject child，DependencyProperty dp，FrugalStructList1& childRecordFromChildIndex, EffectiveValueEntry& entry, ValueLookupType& sourceType, FrameworkElementFactory templateRoot) at System.Windows.StyleHelper.GetValueFromTemplatedParent(DependencyObject container, Int32 childIndex, FrameworkObject child, DependencyProperty dp, FrugalStructList1& childRecordFromChildIndex，childRecordFromChildIndex，EffectiveValueEntry& entry)在System.Windows.StyleHelper.ApplyTemplatedParentValue(DependencyObject容器中，FrameworkObject，en21#，#1和，布尔，)在容器，对象)在，DependencyObject&，容器，en33#，System.Windows.FrameworkTemplate.<>c__DisplayClass45_0.b__2(Object发送者( INameScope nameScope)，(以System.Xaml.XamlObjectWriter.OnBeforeProperties(Object值计算的XamlObjectEventArgs args(XamlObjectEventArgs args) )( System.Xaml.XamlObjectWriter.Logic_CreateAndAssignToParentStart(ObjectWriterContext ctx)在System.Xaml.XamlObjectWriter.WriteStartMember(XamlMember属性(System.Xaml.XamlObjectWriter.WriteStartMember(XamlMember property) )( System.Xaml.XamlWriter.WriteNode(XamlReader reader) at System.Windows.FrameworkTemplate.LoadTemplateXaml(XamlReader templateReader，XamlObjectWriter currentWriter)

提前感谢你的帮助