C# 使用转换器设置WPF单元样式

我有两个WPF单元样式，我想基于转换器应用它们。 下面是我的示例，我正在尝试更改背景颜色（在实际应用中，我将更改更多，但这不是问题的重点，所以我只是简化）

那么，我如何将其称为单元格样式

XAML：

...

---

也许答案是这是不可能的，我需要走另一条路？

绑定在DataGridColumn的

CellStyle

中不起作用，因此请尝试为

TextBox

目标类型而不是

DataGridCell

创建样式，并编写一个

DataGridTemplateColumn

，如下所示：

<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>

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();
    }
}

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>

或者您可以这样做：将转换器的逻辑更改为返回

True

或

False

，您可以在CellStyle中编写以下内容：

<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>

这是一种享受，只是想知道是否有什么原因使单元格样式不能采用更方便的绑定？@DermFrench：这是因为

DataGridColumns

与DataGrid位于不同的

VisualTree

中。因此，默认情况下，它不会继承DataGrid的

DataContext

，并且

绑定也不起作用。除了我的回答之外，您还可以使用代理来继承所讨论的DataContext。
<DataGridTemplateColumn.CellTemplate>
    <DataTemplate>                           
        <TextBox Style="{Binding Path=Text,
                                 RelativeSource={RelativeSource Mode=Self}, 
                                 Converter={StaticResource StyleConverter}}"
                 Text="{Binding Path=NumberValue}" />                            
    </DataTemplate>
</DataGridTemplateColumn.CellTemplate>

<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>

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();
    }
}

<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>