使用转换器设置WPF单元格样式

本文关键字：单元格 样式 WPF 设置 转换器 | 更新日期: 2023-09-27 17:50:02

我有两个WPF单元格样式，我想基于转换器应用它们。下面是我的例子，我试图改变背景颜色(在实际应用中，我会改变更多，但这不是问题的重点，所以我只是简化)。

<Style TargetType="{x:Type DataGridCell}" x:Key="WinCellStyle">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type DataGridCell}">
                <Border x:Name="border"
                        Background="LightGreen"
                        BorderBrush="Transparent"
                        BorderThickness="1"
                        SnapsToDevicePixels="True">
                    <ContentPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>
<Style TargetType="{x:Type DataGridCell}" x:Key="LossCellStyle">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type DataGridCell}">
                <Border x:Name="border"
                        Background="LightSalmon"
                        BorderBrush="Transparent"
                        BorderThickness="1"
                        SnapsToDevicePixels="True">
                    <ContentPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

我有一个转换器:

public class AmountToCellStyleConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        var valueAsDecimal = (decimal?) value;
        if (valueAsDecimal > 0)
        {
            return Application.Current.FindResource("WinCellStyle") as Style;
        }
        return Application.Current.FindResource("LossCellStyle") as Style;
    }
    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    }       
}

我如何在单元格样式中调用它?

XAML: 

<Window.Resources>
    <converter:AmountToCellStyleConverter  x:Key="AmountToCellStyleConverter"/>      
</Window.Resources>
...
<DataGridTextColumn CellStyle="{Binding ??? What goes here}" Binding="{Binding Path=MarketBookSelection.TotalWagerStakeWin, StringFormat=N2}" Header="Stake Win" Width="Auto" />

也许答案是这是不可能的，我需要走其他路线?

使用转换器设置WPF单元格样式

绑定在DataGridColumn的CellStyle中不工作，因此尝试为TextBox目标类型创建样式，而不是DataGridCell，并编写DataGridTemplateColumn:

<DataGrid.Resources>
    <local:AmountToCellStyleConverter x:Key="StyleConverter" /> 
</DataGrid.Resources>
...
<DataGridTemplateColumn Width="1.5*" 
                        Header="SimpleHeader"
                        IsReadOnly="False">
    <DataGridTemplateColumn.CellTemplate>
        <DataTemplate>                           
            <TextBox Style="{Binding Path=NumberValue, Converter={StaticResource StyleConverter}}"
                     Text="{Binding Path=NumberValue}" />                            
        </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>

或者写一个值而不是两个值，在这种情况下，转换器的输入值类型将是String:

<DataGridTemplateColumn.CellTemplate>
    <DataTemplate>                           
        <TextBox Style="{Binding Path=Text,
                                 RelativeSource={RelativeSource Mode=Self}, 
                                 Converter={StaticResource StyleConverter}}"
                 Text="{Binding Path=NumberValue}" />                            
    </DataTemplate>
</DataGridTemplateColumn.CellTemplate>

TextBox的样式位于App.xaml:

<Application.Resources>
    <Style x:Key="WinCellStyle" TargetType="{x:Type TextBox}">
        <Setter Property="SnapsToDevicePixels" Value="True" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type TextBoxBase}">
                    <Border Background="LightGreen"
                            BorderThickness="1">
                        <ScrollViewer x:Name="PART_ContentHost" 
                                      SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <Style x:Key="LossCellStyle" TargetType="{x:Type TextBox}">
        <Setter Property="SnapsToDevicePixels" Value="True" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type TextBox}">
                    <Border Background="LightSalmon"
                            BorderThickness="1">
                        <ScrollViewer x:Name="PART_ContentHost" 
                                      SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</Application.Resources>

Converter看起来像这样:

public class AmountToCellStyleConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        var valueAsDecimal = (int)value;
        if (valueAsDecimal > 0)
        {
            return Application.Current.FindResource("WinCellStyle") as Style;
        }
        return Application.Current.FindResource("LossCellStyle") as Style;
    }
    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

或者你可以这样做:改变转换器的逻辑返回True或False，在CellStyle中你可以这样写:

<DataGridTextColumn Header="SimpleHeader"                                    
                    Width="1.5*" 
                    Binding="{Binding Path=NumberValue}">
    <DataGridTextColumn.CellStyle>
        <Style TargetType="{x:Type DataGridCell}">
            <Style.Triggers>
                <DataTrigger Binding="{Binding Path=NumberValue, Converter={StaticResource MyConverter}}" Value="True">
                    <Setter Property="Background" Value="Yellow" />
                    <Setter Property="BorderThickness" Value="1" />
                </DataTrigger>
                <DataTrigger Binding="{Binding Path=NumberValue, Converter={StaticResource MyConverter}}" Value="False">
                    <Setter Property="Background" Value="Red" />
                    <Setter Property="BorderThickness" Value="1" />
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </DataGridTextColumn.CellStyle>
</DataGridTextColumn>
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