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wpf datatrigger未在预期时触发

datatrigger wpf

29

17 of 26 · 技术社区 · 18 年前

我有以下XAML:

<TextBlock Text="{Binding ElementName=EditListBox, Path=SelectedItems.Count}" Margin="0,0,5,0"/>
<TextBlock Text="items selected">
    <TextBlock.Style>
        <Style TargetType="{x:Type TextBlock}">
            <Style.Triggers>
                <DataTrigger Binding="{Binding ElementName=EditListBox, Path=SelectedItems.Count}" Value="1">
                    <Setter Property="TextBlock.Text" Value="item selected"></Setter>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </TextBlock.Style>
</TextBlock>

第一个文本块使用selecteditems.count愉快地更改,显示0、1、2等。第二个块上的DataTrigger似乎从未触发以更改文本。

有什么想法吗?

2 回复 | 直到 18 年前

1

13

Alan Le 18 年前

public class CountToSelectedTextConverter : IValueConverter
{
    #region IValueConverter Members

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if ((int)value == 1)
            return "item selected";
        else
            return "items selected";
    }

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

    #endregion
}

xmlns:local="clr-namespace:ValueConverterExample"

<Window.Resources>
    <local:CountToSelectedTextConverter x:Key="CountToSelectedTextConverter"/>
</Window.Resources>

    <TextBlock Text="{Binding ElementName=EditListBox, Path=SelectedItems.Count, Converter={StaticResource CountToSelectedTextConverter}}"/>

2

28

Robert Macnee 18 年前

<TextBlock Margin="0,0,5,0" Text="{Binding ElementName=EditListBox, Path=SelectedItems.Count}"/>
<TextBlock>
    <TextBlock.Style>
        <Style TargetType="{x:Type TextBlock}">
            <Setter Property="Text" Value="items selected"/>
            <Style.Triggers>
                <DataTrigger Binding="{Binding ElementName=EditListBox, Path=SelectedItems.Count}" Value="1">
                    <Setter Property="Text" Value="item selected"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </TextBlock.Style>
</TextBlock>