Wpf 按钮数据触发
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/30330179/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Wpf button data trigger
提问by user3089816
i have a button in my wpf form and the button is having the image text in mvvm application when i click the button it will attach the file, my requirement is when it attached successfully i want to remove the image from the button and want to update the button with some text.
我的 wpf 表单中有一个按钮，当我单击该按钮时，该按钮在 mvvm 应用程序中具有图像文本，它将附加文件，我的要求是当它成功附加时，我想从按钮中删除图像并想要更新带有一些文字的按钮。
<StackPanel Grid.Row="3" Orientation="Horizontal" HorizontalAlignment="Right">
<Button ToolTip="Attach Approval"
Height="25"
Command="{Binding AddAttachmentCommand}"
Margin="5,10,5,10">
<StackPanel Orientation="Horizontal">
<Image Source="/UILibrary;component/Themes/Default/Images/Attach.PNG"/>
</StackPanel>
<Button.Style>
<Style TargetType="{x:Type Button}">
<Style.Triggers>
<DataTrigger Binding="{Binding IsAttachmentAvailable}" Value="True">
<Setter Property="Visibility" Value="Visible"/>
<Setter Property="Content" Value="Appprove"/>
</DataTrigger>
<DataTrigger Binding="{Binding IsAttachmentAvailable}" Value="False">
<Setter Property="Visibility" Value="Visible"/>
</DataTrigger>
</Style.Triggers>
</Style>
</Button.Style>
</Button>
<StackPanel Orientation="Horizontal"
Height="25"
Margin="5,10,5,10"
Visibility="{Binding IsAttachmentAvailable, Converter={StaticResource BooleanToVisibilityConverter}}">
<TextBlock Margin="3">
<Hyperlink Command="{Binding OpenAttachmentCommand}">
<TextBlock Text="{Binding Attachment.FileName}"/>
</Hyperlink>
</TextBlock>
<customControls:CloseButton Width="15" Height="15" Command="{Binding RemoveAttachmentCommand}">
<customControls:CloseButton>
Remove attachment
</customControls:CloseButton>
</customControls:CloseButton>
</StackPanel>
<Button Height="25"
Width="80"
Margin="5,10,5,10"
Content="Approve"
Command="{Binding ApproveTemplateCommand}"/>
<Button Height="25"
Width="80"
Margin="5,10,5,10"
Content="Preview"
Command="{Binding PreviewTemplateCommand}"/>
<Button Content="Save"
Command="{Binding SaveTemplateCommand}"
Height="25"
Width="80"
Margin="5,10,5,10"/>
<Button Height="25"
Width="80"
Margin="5,10,10,10"
Content="Cancel"
Command="{Binding CancelCommand}"/>
</StackPanel>
回答by Rachel
If Button.Contentis set in the <Button>tag itself like you have, it will take precedence over any styled values.
如果像您一样Button.Content在<Button>标签本身中设置，它将优先于任何样式值。
You need to move your StackPanel out of the <Button.Content>tag directly, and put it in the style or another data trigger instead.
您需要将您的 StackPanel<Button.Content>直接移出标签，并将其放入样式或其他数据触发器中。
<Button ToolTip="Attach Approval"
Height="25"
Command="{Binding AddAttachmentCommand}"
Margin="5,10,5,10">
<Button.Style>
<Style TargetType="{x:Type Button}">
<!-- Default Content value -->
<Setter Property="Content">
<Setter.Value>
<StackPanel Orientation="Horizontal">
<Image Source="/UILibrary;component/Themes/Default/Images/Attach.PNG"/>
</StackPanel>
</Setter.Value>
</Setter>
<!-- Triggered values -->
<Style.Triggers>
<DataTrigger Binding="{Binding IsAttachmentAvailable}" Value="True">
<Setter Property="Visibility" Value="Visible"/>
<Setter Property="Content" Value="Appprove"/>
</DataTrigger>
<DataTrigger Binding="{Binding IsAttachmentAvailable}" Value="False">
<Setter Property="Visibility" Value="Visible"/>
</DataTrigger>
</Style.Triggers>
</Style>
</Button.Style>
See MSDN's Dependency Property Precedence Listfor more information.
有关更多信息，请参阅MSDN 的依赖属性优先列表。
