Expander 控件

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：

 <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>

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。