[英]WPF Combobox Selected Item Error - Showing “System.Data.Entity.DynamicProxies”
[英]WPF Custom ComboBox Showing "System.Windows.Styles" on item
我创建了一个自定义的 WPF ComboBox,如下所示:
<ComboBox
x:Name="ComboBoxBtn"
VerticalAlignment="Top"
HorizontalAlignment="Left"
Margin="0,0,0,-1"
Width="300"
ItemsSource="{Binding Source, RelativeSource={RelativeSource AncestorType=UserControl}}"
SelectedItem="{Binding Path=Selected, Mode=TwoWay, RelativeSource={RelativeSource AncestorType=UserControl}}"
IsSynchronizedWithCurrentItem="True">
<ComboBox.ItemTemplate>
<DataTemplate>
<ContentControl>
<Style TargetType="ContentControl">
<Style.Triggers>
<DataTrigger Binding="{Binding Favorite}" Value="True">
<Setter Property="Content">
<Setter.Value>
<Grid>
<Grid.Style>
<Style TargetType="Grid">
<Setter Property="Background" Value="#FFE6E6FA"/>
</Style>
</Grid.Style>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<Label Content="{Binding}" Width="250" />
<Button Grid.Column="1" Command="{Binding AddCommandButton, ElementName=root}"
CommandParameter="{Binding}">+</Button>
</Grid>
</Setter.Value>
</Setter>
</DataTrigger>
<DataTrigger Binding="{Binding Favorite}" Value="False">
<Setter Property="Content">
<Setter.Value>
<Grid>
<Grid.Style>
<Style TargetType="Grid">
<Setter Property="Background" Value="Yellow"/>
</Style>
</Grid.Style>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<Label Content="{Binding}" Width="250" />
<Button Grid.Column="1" Command="{Binding RemoveCommandButton, ElementName=root}"
CommandParameter="{Binding}">-</Button>
</Grid>
</Setter.Value>
</Setter>
</DataTrigger>
</Style.Triggers>
</Style>
</ContentControl>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
Source 绑定包含一个 ObservableColleciton,其中客户端有一个收藏夹字段,应该显示不同的背景和不同的按钮。 但是当我打开 ComboBox 时,所有项目都有:
“系统.Windows.样式”
您的问题是您在内容控件中将样式设置为内容。
<ContentControl>
<Style TargetType="ContentControl">
...
</Style>
</ContentControl>
为了设置内容控件的样式,您应该添加:
<ContentControl.Style>
所以上面的代码看起来像这样:
<ContentControl>
<ContentControl.Style>
<Style TargetType="ContentControl">
...
</Style>
<ContentControl.Style>
</ContentControl>
编辑
顺便说一句,对于更改背景的简单任务,您的代码非常复杂。 这是一个简化版本:
<ComboBox.ItemTemplate>
<DataTemplate>
<Grid Name="PART_GRID" Background="Yellow">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<Label Content="{Binding}"
Width="250" />
<Button Name="PART_BUTTON"
Grid.Column="1"
Content="-"
Command="{Binding AddCommandButton, ElementName=root}"
CommandParameter="{Binding}" />
</Grid>
<DataTemplate.Triggers>
<DataTrigger Binding="{Binding Favorite}"
Value="True">
<Setter TargetName="PART_GRID"
Property="Background"
Value="#FFE6E6FA" />
<Setter TargetName="PART_BUTTON"
Property="Content"
Value="+" />
<Setter TargetName="PART_BUTTON"
Property="Command"
Value="{Binding RemoveCommandButton, ElementName=root}" />
</DataTrigger>
</DataTemplate.Triggers>
</DataTemplate>
</ComboBox.ItemTemplate>
就我而言,我发现我有:
<ComboBox>
<Style>
</Style>
</ComboBox>
这是直接添加一个样式作为一个项目,这类似于上面的解决方案。
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