如何在WPF网格列中定位元素？

<Grid>
   <Button Grid.Column="1" Grid.Row="2">Click me</Button>
</Grid>

Grid grid = new Grid();
Button button = new Button { Content = "Click me" };
Grid.SetColumn(button, 1);
Grid.SetRow(button, 2);
grid.Children.Add(button);

<Grid>
    <Grid.ColumnDefinitions>
       <ColumnDefinition Width="100" />
       <ColumnDefinition Width="*" />
       <ColumnDefinition Width="Auto" />
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
        <RowDefinition Height="100" />
        <RowDefinition Height="*" />
        <RowDefinition Height="Auto" />
    </Grid.RowDefinitions>
   <Button Grid.Column="1" Grid.Row="2">Click me</Button>
</Grid>

<Grid Grid.IsSharedSizeScope="True">
    <Grid.ColumnDefinitions>
       <ColumnDefinition SharedSizeGroup="A" />
       <ColumnDefinition SharedSizeGroup="B" />
       <ColumnDefinition SharedSizeGroup="C" />
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
        <RowDefinition SharedSizeGroup="A" />
        <RowDefinition SharedSizeGroup="B" />
        <RowDefinition SharedSizeGroup="C" />
    </Grid.RowDefinitions>
   <Button Grid.Column="1" Grid.Row="2">Click me</Button>
</Grid>