如何在WPF中的现有ItemContainerStyle中以编程方式添加新的setter？

Question

我有列表视图的项容器样式,如下所示:

<ListView.ItemContainerStyle>
    <Style>
        <Setter Property="Padding" Value="0"></Setter>
        <Setter Property="Margin" Value="0,0,0,-1"></Setter>
        <Style.Triggers>
            <DataTrigger Binding="{Binding Path=EventType}" Value="2">
                <Setter Property="Background" Value="Green"/>
                <Setter Property="Foreground" Value="White"></Setter>
            </DataTrigger>
        </Style.Triggers>
    </Style>
</ListView.ItemContainerStyle>

现在我需要根据项目数据以编程方式为上下文菜单添加新的setter.我该怎么做 ？

请指导我.....

谢谢

Answer 1

我必须动态显示图像,显示/隐藏取决于使用Style和DataTrigger的复选框状态.

<Image Source="/WpfApplication;component/Imgs/img1_1.png">
<Image.Style>
    <Style>
        <Setter Property="Image.Visibility" Value="Collapsed"></Setter>
        <Style.Triggers>
            <DataTrigger Binding="{Binding ElementName=isDisplayingImgSet1, Path=IsChecked}" Value="True">
                <Setter Property="Image.Visibility" Value="Visible"></Setter>
            </DataTrigger>
        </Style.Triggers>
    </Style>
</Image.Style>

规范修改后,我必须动态创建复选框,然后设置样式.一开始,我有相同的错误消息.

Image img = new Image();
//..
img.Style.Setters.Add(setter);
img.Style.Triggers.Add(trigger);
//..After a 'SetterBaseCollection' is in use (sealed), it cannot be modified.

解决方案是创建一个样式对象并将其影响到Image.Style

//Visibility
DataTrigger trigger = new DataTrigger();
trigger.Binding = new Binding
{
     ElementName = "isDisplayingImgSet"+NumSet,
     Path = new PropertyPath(CheckBox.IsCheckedProperty)
};
trigger.Value = "True";
trigger.Setters.Add(new Setter(ContentControl.VisibilityProperty, Visibility.Visible));

Setter setter = new Setter(ContentControl.VisibilityProperty, Visibility.Collapsed);
Style style = new Style(typeof(Image));
style.Setters.Add(setter);
style.Triggers.Add(trigger);
img.Style = style;

希望能帮到你

PS:这是我的第一篇文章