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如何组合两个条件来覆盖datagrid的选定行样式?

mahapps.metro xaml wpf

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erotavlas · 技术社区 · 7 年前

我有一个DataGrid,集合中的对象有一个属性isvalid当一个项无效时(isvalid==false),我使用数据触发器将行前景颜色设置为红色。

这是可行的,但是当我选择一个无效的行时,数据网格行上的选择样式会覆盖我设置的前景颜色,它不再是红色(它只是显示为默认的主题前景颜色)。

我想把这个组合起来

<Trigger Property="IsSelected" Value="true">
    <Setter Property="Foreground" Value="Red"></Setter>
</Trigger>

具备以下条件

<DataGrid.RowStyle>
    <Style TargetType="DataGridRow" BasedOn="{StaticResource MetroDataGridRow}">
        <Style.Triggers>
            <DataTrigger Binding="{Binding Path=isvalid}" Value="false">
                <Setter Property="Foreground" Value="Red"></Setter>
            </DataTrigger>
        </Style.Triggers>
    </Style>
</DataGrid.RowStyle>

一行的前景色应该是红色的,不管它是否被选中(但只有当isvalid==false时)

我试着从 this post

<MultiDataTrigger.Conditions>
    <Condition Property="IsSelected" Value="True"/>
    <Condition Binding="{Binding Path=isvalid}" Value="false" ></Condition>
</MultiDataTrigger.Conditions>

System.InvalidOperationException-必须具有非空值

0 回复 | 直到 7 年前

1

3

mm8 7 年前

CellStyle 再加上一个 DataTrigger :

<DataGrid ...>
    <DataGrid.CellStyle>
        <Style TargetType="{x:Type DataGridCell}">
            <Setter Property="Background" Value="Transparent"/>
            <Setter Property="BorderBrush" Value="Transparent"/>
            <Setter Property="BorderThickness" Value="1"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type DataGridCell}">
                        <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="True">
                            <ContentPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                        </Border>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
            <Style.Triggers>
                <Trigger Property="IsSelected" Value="True">
                    <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
                    <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}"/>
                    <Setter Property="BorderBrush" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
                </Trigger>
                <Trigger Property="IsKeyboardFocusWithin" Value="True">
                    <Setter Property="BorderBrush" Value="{DynamicResource {x:Static DataGrid.FocusBorderBrushKey}}"/>
                </Trigger>
                <MultiTrigger>
                    <MultiTrigger.Conditions>
                        <Condition Property="IsSelected" Value="true"/>
                        <Condition Property="Selector.IsSelectionActive" Value="false"/>
                    </MultiTrigger.Conditions>
                    <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.InactiveSelectionHighlightBrushKey}}"/>
                    <Setter Property="BorderBrush" Value="{DynamicResource {x:Static SystemColors.InactiveSelectionHighlightBrushKey}}"/>
                    <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.InactiveSelectionHighlightTextBrushKey}}"/>
                </MultiTrigger>
                <Trigger Property="IsEnabled" Value="false">
                    <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
                </Trigger>
                <DataTrigger Binding="{Binding isvalid}" Value="false">
                    <Setter Property="Foreground" Value="Red"></Setter>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </DataGrid.CellStyle>
    <DataGrid.RowStyle>
        <Style TargetType="DataGridRow" BasedOn="{StaticResource MetroDataGridRow}">
            <Style.Triggers>
                <DataTrigger Binding="{Binding isvalid}" Value="false">
                    <Setter Property="Foreground" Value="Red"></Setter>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </DataGrid.RowStyle>
</DataGrid>