问题描述
我想在WPF DataGrid中显示具有不同背景颜色（灰色）的奇数行与偶数行。我已经将RowBackground="#DDD"本身的AlternatingRowBackground="#EEE"，AlternationCount=2和DataGrid属性与Style.Triggers本身一起使用来改变未选择的行的颜色。
我已经在StackOverflow上浏览了很多线程，但是找不到<DataGrid.RowStyle>
<Style targettype="DataGridRow">
<!-- Changes the row style template to have more advanced "borders" (dotted,dashed,etc.) based on value converters -->
<Setter Property="Template">
<!-- ... -->
</Setter>
<!-- Changes the background color of odd rows (will do the same for even one with a slightly different color) -->
<Style.Triggers>
<multidatatrigger>
<multidatatrigger.Conditions>
<Condition Binding="{Binding IsSelected,RelativeSource={RelativeSource Self}}"
Value="True"/>
<Condition Binding="{Binding (behaviors:DataGridBehavior.IsOddRow),RelativeSource={RelativeSource Self}}"
Value="True"/>
</multidatatrigger.Conditions>
<multidatatrigger.Setters>
<Setter Property="Background"
Value="LightYellow"/>
</multidatatrigger.Setters>
</multidatatrigger>
<!-- Same principle for even rows -->
<!-- ... -->
</Style.Triggers>
</Style>
</DataGrid.RowStyle>
无效的原因。我使用此attached property来确定它是奇数行还是偶数行。
Condition如果我在MutliDataTrigger中仅使用一个const CPromise= require("c-promise2");
// cancellable sleep
function sleep(ms,signal) {
return new CPromise((resolve,reject,{onCancel}) => {
const timer = setTimeout(resolve,ms);
onCancel(() => clearTimeout(timer));
},{signal}).catch(() => {});
}
(async()=>{
const sleeper= sleep(30000);
socket.on("end_sleep",function(){
sleeper.cancel();
});
await sleeper;
})();
，则效果相同（否）。
感谢您的见解：-）
解决方法
您不必为此使用自定义行为，可以使用内置的交替机制。
<DataGrid AlternationCount="2"
...>
<!-- ...other properties -->
</DataGrid>
使用DataGridRow和AlternationIndex附加属性的触发器为IsSelected创建样式。请注意，我们也必须在此处设置行背景色和交替背景色，因为在DataGrid上设置RowBackground和AlternatingRowBackground将会覆盖样式和选择突出显示将不起作用，因此请将它们从DataGrid中删除。
<DataGrid.RowStyle>
<Style TargetType="{x:Type DataGridRow}" BasedOn="{StaticResource {x:Type DataGridRow}}">
<!-- Changes the row style template to have more advanced "borders" (dotted,dashed,etc.) based on value converters -->
<Setter Property="Template">
<!-- ... -->
</Setter>
<!-- Part for odd rows. -->
<Style.Triggers>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsSelected"
Value="False"/>
<Condition Property="AlternationIndex"
Value="1"/>
</MultiTrigger.Conditions>
<MultiTrigger.Setters>
<Setter Property="Background"
Value="#EEE"/>
</MultiTrigger.Setters>
</MultiTrigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsSelected"
Value="True"/>
<Condition Property="AlternationIndex"
Value="1"/>
</MultiTrigger.Conditions>
<MultiTrigger.Setters>
<Setter Property="Background"
Value="Yellow"/>
</MultiTrigger.Setters>
</MultiTrigger>
<!-- Part for even rows. -->
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsSelected"
Value="False"/>
<Condition Property="AlternationIndex"
Value="0"/>
</MultiTrigger.Conditions>
<MultiTrigger.Setters>
<Setter Property="Background"
Value="#DDD"/>
</MultiTrigger.Setters>
</MultiTrigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsSelected"
Value="True"/>
<Condition Property="AlternationIndex"
Value="0"/>
</MultiTrigger.Conditions>
<MultiTrigger.Setters>
<Setter Property="Background"
Value="LightYellow"/>
</MultiTrigger.Setters>
</MultiTrigger>
</Style.Triggers>
</Style>
</DataGrid.RowStyle>
由于DataGridCell是DataGridRow的子级，因此在那里定义的选择颜色将遮盖行颜色。为了避免也为DataGridCell创建相同的样式，我们在选择背景时将其背景设置为透明。
<DataGrid.CellStyle>
<Style TargetType="{x:Type DataGridCell}" BasedOn="{StaticResource {x:Type DataGridCell}}">
<Style.Triggers>
<DataTrigger Binding="{Binding IsSelected,RelativeSource={RelativeSource AncestorType={x:Type DataGridRow}}}"
Value="True">
<Setter Property="Background"
Value="Transparent"/>
</DataTrigger>
</Style.Triggers>
</Style>
</DataGrid.CellStyle>