C# 使用触发器 WPF MVVM 更改图像
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Change image using trigger WPF MVVM
提问by Nathan W
This may be a no brainier but I just can't seem to get it to work. I have a view model that exposes a property called bool NotFoundI would like to bind that to a trigger so that when it changes an image on my control changes.
这可能并不明智，但我似乎无法让它发挥作用。我有一个视图模型，它公开一个名为bool NotFound的属性，我想将它绑定到一个触发器，以便当它更改我的控件上的图像时。
This is the xaml that I am using as a data template for one of my view models.
这是我用作视图模型之一的数据模板的 xaml。
<DataTemplate DataType="{x:Type local:TabFileViewModel}">
<StackPanel Orientation="Horizontal">
<Image Width="16" Height="16" Margin="3,0" Source="Image\TabFile.PNG" />
<TextBlock Text="{Binding Name}" ToolTip="{Binding FullPath}"/>
</StackPanel>
</DataTemplate>
I would like to be able to bind the to the NotFoundproperty and change the image source.
我希望能够将 绑定到NotFound属性并更改图像源。
采纳答案by Nathan W
It's all good I figured it out.
一切都很好，我想通了。
<DataTemplate DataType="{x:Type local:TabFileViewModel}">
<StackPanel Orientation="Horizontal">
<Image Width="16" Height="16" Margin="3,0">
<Image.Style>
<Style TargetType="{x:Type Image}">
<Style.Triggers>
<DataTrigger Binding="{Binding NotFound}" Value="false">
<Setter Property="Source" Value="Image\TabFile.PNG"/>
</DataTrigger>
<DataTrigger Binding="{Binding NotFound}" Value="true">
<Setter Property="Source" Value="Image\ErrorTabFile.PNG"/>
</DataTrigger>
</Style.Triggers>
</Style>
</Image.Style>
</Image>
</DataTemplate>
回答by bitbonk
<DataTemplate DataType="{x:Type local:TabFileViewModel}">
<StackPanel Orientation="Horizontal">
<Grid>
<Image x:Name="a" Width="16" Height="16" Margin="3,0" Source="Image\NotFounds.PNG" />
<Image x:Name="b" Width="16" Height="16" Margin="3,0" Source="Image\TabFile.PNG" />
</Grid>
<TextBlock Text="{Binding Name}" ToolTip="{Binding FullPath}"/>
</StackPanel>
<DataTemplate.Triggers>
<DataTrigger Binding={Binding NotFound} Value="true">
<Setter TargetName="a" TargetProperty="Visibility" Value="Visible" />
<Setter TargetName="b" TargetProperty="Visibility" Value="Hidden" />
</DataTrigger>
<DataTrigger Binding={Binding NotFound} Value="false">
<Setter TargetName="a" TargetProperty="Visibility" Value="Hidden" />
<Setter TargetName="b" TargetProperty="Visibility" Value="Visible" />
</DataTrigger>
</DataTemplate.Triggers>
</DataTemplate>
