'成员'Opacity'无法识别或无法访问.为什么我不能设置不透明度? [英] 'The member "Opacity" is not recognized or is not accessible.' Why can't I set the opacity?

问题描述

我想使用 DataTrigger 修改按钮的不透明度.

I would like to use a DataTrigger to modify the opacity of my button.

                <Button x:Name="StartTreatment"
                    Grid.Column="3"
                    Width="160"
                    Height="30"
                    Content="{x:Static resources:UserMessages.TrcsConsoleViewModel_LoadWfSequence_StartProcedure}"
                    IsEnabled="{Binding CanStartProcedure}"
                    Visibility="{Binding CanStartPatientTreatment, Converter={StaticResource BooleanToVisibility}}" >
                <Button.Style>
                    <Style>
                        <Style.Triggers>
                            <DataTrigger Binding="{Binding CanStartProcedure}" Value="False">
                                <Setter Property="Opacity" Value="0.5"></Setter>
                            </DataTrigger>
                        </Style.Triggers>
                    </Style>
                </Button.Style>
            </Button>

我知道 Button 具有您可以设置的 Opacity，并且必须在 Style 中使用 DataTriggers.但是，编译器报告无法识别或无法访问成员Opacity".我做错了什么?

I know that a Button has an Opacity you can set, and that DataTriggers must be used in a Style. However the compiler is reporting 'The member "Opacity" is not recognized or is not accessible.' What am I doing wrong?

推荐答案

你应该添加TargetType:

...
<Button.Style>
    <Style TargetType="Button">
        <Style.Triggers>
            <DataTrigger Binding="{Binding CanStartProcedure}" Value="False">
                <Setter Property="Opacity" Value="0.5"></Setter>
            </DataTrigger>
        </Style.Triggers>
    </Style>
</Button.Style>
...

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