WPF ListView 对象数据触发器

Question

我正在尝试根据列表视图项对象的数据字段设置列表视图项内的矩形样式。

到 return 布尔值我正在使用 IValueConverter 将整数从 daydata.workload 转换为布尔值。

我没有发现任何异常，只是矩形不受 DataTrigger 的影响。其他样式规则工作正常。

<Window.Resources>
    <cv:numConverter x:Key="capacityConverter" />
<Window.Resources>

-

<ListView Name="weekView" ItemsSource="{Binding dayList}" ItemTemplate="{StaticResource DefaultTemplate}" >
            <ListView.Resources>
                <Style TargetType="Rectangle" x:Key="capacityBG">

                    <Setter Property="Stroke" Value="#FFE2E2E2" />
                    <Setter Property="Width" Value="180" />
                    <Setter Property="Height" Value="10" />
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding Path=dayList.workload, Converter={StaticResource capacityConverter}, ConverterParameter=12}">
                            <DataTrigger.Value>true</DataTrigger.Value>
                            <Setter Property="Fill" Value="Red"/>
                        </DataTrigger>

                    </Style.Triggers>
                </Style>
            </ListView.Resources>
            <ListView.ItemsPanel>
                <ItemsPanelTemplate>
                    <StackPanel Orientation="Horizontal"></StackPanel>
                </ItemsPanelTemplate>
            </ListView.ItemsPanel>
            <ListView.ItemContainerStyle>
                <Style TargetType="{x:Type ListViewItem}">
                    <Setter Property="Background" Value="Transparent" />
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="{x:Type ListViewItem}">
                                <ContentPresenter />
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </ListView.ItemContainerStyle>
        </ListView>

-

<Rectangle Style="{DynamicResource capacityBG}" VerticalAlignment="Top" Grid.Row="0" />

-

  public class numConverter : IValueConverter
{

    object IValueConverter.Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return ((int)value) > val;
    }

    object IValueConverter.ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }

    public int val { get; set; }
}

-

public class dayData
{
    public DateTime date { get; set; }
    public int workload { get; set; }

    public List<job> jobs { get; set; }
}

Answer 1

这里的问题是为转换器参数输入的值和数据触发值被视为字符串。您需要为这些值中的每一个指定类型，如下所示：

xmlns:sys="clr-namespace:System;assembly=mscorlib"

    <Style.Triggers>
            <DataTrigger>
                <DataTrigger.Binding>
                    <Binding Path="WorkLoad" Converter="{StaticResource capacityConverter}">
                        <Binding.ConverterParameter>
                            <sys:Int32>12</sys:Int32>
                        </Binding.ConverterParameter>
                    </Binding>
                </DataTrigger.Binding>
                <DataTrigger.Value>
                    <sys:Boolean>true</sys:Boolean>
                </DataTrigger.Value>
                <Setter Property="Fill" Value="Red"/>
            </DataTrigger>
    </Style.Triggers>

然后您可以将转换器参数转换为 int 进行比较。

    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return (int)value > (int)parameter;
    }

WPF ListView 对象数据触发器

WPF ListView Object DataTrigger

c#

wpf

datatrigger

ivalueconverter