<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition></ColumnDefinition>
<ColumnDefinition></ColumnDefinition>
<ColumnDefinition></ColumnDefinition>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition></RowDefinition>
<RowDefinition></RowDefinition>
<RowDefinition></RowDefinition>
<RowDefinition></RowDefinition>
</Grid.RowDefinitions>
</Grid>
<Grid.ColumnDefinitions>列定义
<Grid.RowDefinitions>行定义
<ColumnDefinition Width="40"></ColumnDefinition> 列有宽度定义
<RowDefinition Height="20"></RowDefinition>行有高度定义
