WPF DataGrid AlternatingRowBackground覆盖背景的Style DataTrigger [英] WPF DataGrid AlternatingRowBackground overriding the Style DataTrigger for background

问题描述

我有一个DataGrid，其中显示了多行数据.为了帮助视觉上区分行，我为交替的行添加了背景色.

I have a DataGrid where I show many lines of data. To help visually differentiate the rows I've added a background colour to alternating rows.

但是，有些行包含非常有趣的数据，我希望吸引用户的注意，因此我使用Style DataTrigger突出显示了这些特定行.

But, there are some rows that contains very interesting data that I want to attract the user's attention to, and so I use a Style DataTrigger to highlight those specific rows.

我的问题是交替的背景颜色优先-只有奇数行(没有背景颜色)显示突出显示.

My problem is that the alternating background colour takes precedence - only the odd rows (no background colour) show the highlight.

请注意，这是一个使用MVVM模式的数据绑定DataGrid(无"code-behind").

Note, this is a data-bound DataGrid using the MVVM pattern (no "code-behind").

(非常删减)代码如下:

The (very cutdown) code is as follows:

<DataGrid ItemsSource="{Binding FilteredTraceMessages, Mode=OneWay}" 
            AlternatingRowBackground="AliceBlue"
            .......>

    <DataGrid.Columns>
        ....
    </DataGrid.Columns>

    <DataGrid.RowStyle>
        <Style TargetType="DataGridRow">
            <Style.Triggers>
                <DataTrigger Binding="{Binding Severity}" Value="Error">
                    <Setter Property="Background" Value="LightSalmon"></Setter>
                </DataTrigger>
                <DataTrigger Binding="{Binding Severity}" Value="Warning">
                    <Setter Property="Background" Value="LemonChiffon"></Setter>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </DataGrid.RowStyle>
</DataGrid>

推荐答案

您必须将 Backround 设置为相同的优先级.请参见依赖项属性设置优先级列表
从 DataGrid 中删除 AlternatingRowBackground ="AliceBlue" ，然后在其中放置 AlternationCount ="2" .然后首先添加 AlternationIndex 的触发器.

You have to set the Backround on the same precedence level. See Dependency Property Setting Precedence List
Delete AlternatingRowBackground="AliceBlue" from the DataGrid and put AlternationCount="2" there. Then add at the first place a trigger for AlternationIndex.

<DataGrid ItemsSource="{Binding FilteredTraceMessages, Mode=OneWay}" AlternationCount="2"
    .......>

    <DataGrid.Columns>
        ....
    </DataGrid.Columns>

    <DataGrid.RowStyle>
        <Style TargetType="DataGridRow">
            <Style.Triggers>
                <Trigger Property="AlternationIndex" Value="1">
                    <Setter Property="Background" Value="AliceBlue"/>
                </Trigger>
                <DataTrigger Binding="{Binding Severity}" Value="Error">
                    <Setter Property="Background" Value="LightSalmon"></Setter>
                </DataTrigger>
                <DataTrigger Binding="{Binding Severity}" Value="Warning">
                    <Setter Property="Background" Value="LemonChiffon"></Setter>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </DataGrid.RowStyle>
</DataGrid>

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