我有一个包含Images路径的ComboBox,我需要使用所选路径作为Image对象的源。我试过这样绑定它:
...
<Border BorderBrush="Black" BorderThickness="1" Grid.Row="0" Grid.Column="2" Grid.RowSpan="3" Width="50" Height="50" Margin="10, 10, 10, 6" VerticalAlignment="Bottom">
<Image Name="Image" Source="{Binding ElementName=ComboBox, Path=SelectedItem.Value, UpdateSourceTrigger=PropertyChanged}"/>
</Border>
...
<ComboBox Name="ComboBox" Grid.Row="2" Grid.Column="1" Margin="4" VerticalAlignment="Center">
<ComboBoxItem IsSelected="True">Images/men.png</ComboBoxItem>
<ComboBoxItem>Images/women.png</ComboBoxItem>
</ComboBox>
...
我做错了什么?
由于显式创建ComboBoxItems,因此必须使用其Content属性来访问项对象:
Source="{Binding ElementName=ComboBox, Path=SelectedItem.Content}"
请注意,设置UpdateSourceTrigger=PropertyChanged
在此绑定中没有任何作用。
或者,您可以将组合框的SelectedValuePath
属性设置为"Content"
,并绑定到SelectedValue
而不是SelectedItem
:
<Image Source="{Binding ElementName=ComboBox, Path=SelectedValue}"/>
...
<ComboBox Name="ComboBox" SelectedValuePath="Content">
<ComboBoxItem IsSelected="True">Images/men.png</ComboBoxItem>
<ComboBoxItem>Images/women.png</ComboBoxItem>
</ComboBox>
另一种选择是使用字符串项而不是ComboBoxItems:
xmlns:system="clr-namespace:System;assembly=mscorlib"
...
<Image Source="{Binding ElementName=ComboBox, Path=SelectedItem}"/>
...
<ComboBox Name="ComboBox" SelectedIndex="0">
<system:String>Images/men.png</system:String>
<system:String>Images/women.png</system:String>
</ComboBox>