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>