WPF Hidden和Collapsed

对于这两种设定，其实已经提示的很清楚了

Visibility="Hidden"
不显示元素，但是在布局为元素保留空间

Visibility="Collapsed"
不显示元素，并且不在布局中为它保留空间

<Grid ShowGridLines="True">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="auto"></ColumnDefinition>
            <ColumnDefinition Width="auto"></ColumnDefinition>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="auto"></RowDefinition>
            <RowDefinition Height="auto"></RowDefinition>
        </Grid.RowDefinitions>
        <Button Width="" Height="" Grid.Column="" Grid.Row=""
                Visibility="Hidden"/>
        <Button Width=""
                Height=""
                Grid.Column=""
                Grid.Row="" />
</Grid>

可以看见，空白区域依旧保留位置

<Grid ShowGridLines="True">
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="auto"></ColumnDefinition>
        <ColumnDefinition Width="auto"></ColumnDefinition>
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
        <RowDefinition Height="auto"></RowDefinition>
        <RowDefinition Height="auto"></RowDefinition>
    </Grid.RowDefinitions>
    <Button Width=""
            Height=""
            Grid.Column=""
            Grid.Row=""
            Visibility="Collapsed" />
    <Button Width=""
            Height=""
            Grid.Column=""
            Grid.Row=""
            />
</Grid>

已经不保留其位置