继续聊WPF——Expander控件（1）

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Expander是一个可以展开和折叠的控件，它包含两部分——标头和内容。
标头通Header属性来设置，内容通过Conent属性设置，如下面一个简单的例子：

<Expander ExpandDirection="Down" Width="96">
<Expander.Header>
<TextBlock Text="标题" FontWeight="Bold"/>
</Expander.Header>
<Expander.Content>
<TextBlock TextWrapping="Wrap"  Text="这里是内容。"/>
</Expander.Content>
</Expander>

Expander控件的Header和Content都可以为任何对象，只要能正常显示即可。
下面就是该控件运行时的截图。





这个控件最实用的地方，就是做导航栏。

<StackPanel Margin="20,20" Width="100" Height="460" HorizontalAlignment="Left"
VerticalAlignment="Top">
<Expander VerticalAlignment="Stretch" ExpandDirection="Down" HorizontalContentAlignment="Left" SnapsToDevicePixels="True">
<Expander.Header>
<TextBlock Text="用户管理" FontSize="14" FontWeight="Bold" />
</Expander.Header>
<Expander.Content>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="auto"/>
<RowDefinition Height="auto"/>
</Grid.RowDefinitions>
<RadioButton Grid.Row="0">会员管理</RadioButton>
<RadioButton Grid.Row="1">角色管理</RadioButton>
</Grid>
</Expander.Content>
</Expander>
<Expander VerticalAlignment="Stretch" ExpandDirection="Down" HorizontalContentAlignment="Left" SnapsToDevicePixels="True">
<Expander.Header>
<TextBlock Text="文档管理" FontSize="14" FontWeight="Bold" />
</Expander.Header>
<Expander.Content>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="auto"/>
<RowDefinition Height="auto"/>
<RowDefinition Height="auto"/>
</Grid.RowDefinitions>
<RadioButton Grid.Row="0">部门资料</RadioButton>
<RadioButton Grid.Row="1">员工资料</RadioButton>
<RadioButton Grid.Row="2">职位资料</RadioButton>
</Grid>
</Expander.Content>
</Expander>
<Expander VerticalAlignment="Stretch" ExpandDirection="Down" HorizontalContentAlignment="Left" SnapsToDevicePixels="True">
<Expander.Header>
<TextBlock Text="采购管理" FontSize="14" FontWeight="Bold" />
</Expander.Header>
<Expander.Content>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="auto"/>
<RowDefinition Height="auto"/>
<RowDefinition Height="auto"/>
<RowDefinition Height="auto"/>
<RowDefinition Height="auto"/>
</Grid.RowDefinitions>
<RadioButton Grid.Row="0">采购计划</RadioButton>
<RadioButton Grid.Row="1">需求分析</RadioButton>
<RadioButton Grid.Row="2">采购单</RadioButton>
<RadioButton Grid.Row="3">入库验收</RadioButton>
<RadioButton Grid.Row="4">入库退回</RadioButton>
</Grid>
</Expander.Content>
</Expander>
<Expander VerticalAlignment="Stretch" ExpandDirection="Down" HorizontalContentAlignment="Left" SnapsToDevicePixels="True">
<Expander.Header>
<TextBlock Text="供应商" FontSize="14" FontWeight="Bold" />
</Expander.Header>
<Expander.Content>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="auto"/>
<RowDefinition Height="auto"/>
<RowDefinition Height="auto"/>
</Grid.RowDefinitions>
<RadioButton Grid.Row="0">基本资料</RadioButton>
<RadioButton Grid.Row="1">往来单位</RadioButton>
<RadioButton Grid.Row="2">上游供应商</RadioButton>
</Grid>
</Expander.Content>
</Expander>
</StackPanel>

另外，通过ExpandDirection属性可控其展开的方向。

<Expander VerticalAlignment="Stretch" ExpandDirection="Right" HorizontalContentAlignment="Left" SnapsToDevicePixels="True">
............

</Expander>