如何在Xamarin.Forms Xaml中设置行/列定义？

Question

我设法从代码中设置行和列,但无法将此设置移动到xaml:

grid.RowDefinitions = new RowDefinitionCollection { 
    new RowDefinition { Height = new GridLength(1, GridUnitType.Star) } 
};
grid.ColumnDefinitions = new ColumnDefinitionCollection { 
    new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) } 
};

以下不起作用:

<Grid x:Name="grid" VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand">
    <Grid.RowDefinitions>
      <RowDefinition Height="*"/>
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
      <ColumnDefinition Width="*"/>
    </Grid.ColumnDefinitions>
    ...
</Grid>

从文档中我设法只获取c#实现

Answer 1

对于具有单个单元格的网格(1行/列,我也得到相同的行为(不填充和扩展),虽然我不确定为什么我们需要一个单个单元格全尺寸屏幕的网格),但它似乎适用于2 x 2,3 x 3单元网格(还没有尝试过其他网格).

Xamarin Forms中需要Height =" "和Width =" "属性,尽管我认为在WPF中不需要它们,因为默认情况下假设是这种情况.

 <ContentPage.Content>
    <Grid VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand">
    <Grid.RowDefinitions>
    <RowDefinition Height="*"></RowDefinition>
    <RowDefinition Height="*"></RowDefinition>
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
    <ColumnDefinition Width="*"></ColumnDefinition>
    <ColumnDefinition Width="*"></ColumnDefinition>
    </Grid.ColumnDefinitions>

    <Button Grid.Row="0" Grid.Column="0" Text="1"></Button>
    <Button Grid.Row="1" Grid.Column="1" Text="2"></Button>
    </Grid>
</ContentPage.Content>