我有这个ListView与2个按钮，在每个列表/项目（加号和减号按钮），只出现在选定的项目。除了这些按钮，选中的项目也将更改颜色为LightGray，预览项目将是透明的（这是工作的伟大）。
但问题是，当我选择一个项目，然后点击加号/减号按钮，它清除选定的项目颜色。因此，只有按钮会保留，但BackgroundColor消失了。
我试图保持浅灰色的颜色，直到我选择一个不同的项目。
因为我是新的这将是伟大的，如果你能帮助我一些例子（如果可能的话，请）。
如果需要更多的信息，请让我知道。
非常感谢。

ItemsPage.xaml

<ListView ItemsSource="{Binding Items, Mode=TwoWay}" x:Name="lstView" SelectedItem="{Binding SelectedItem}" HasUnevenRows="True" RowHeight="50">
  <ListView.ItemTemplate>
    <DataTemplate>
      <ViewCell>
        <Grid Padding="0,0,8,0" Margin="4,0,4,0">
          <Grid.ColumnDefinitions>
            <ColumnDefinition Width="Auto"/>
            <ColumnDefinition Width="7*"/>
          </Grid.ColumnDefinitions>

          <Grid.GestureRecognizers>
            <TapGestureRecognizer NumberOfTapsRequired="1" Tapped="TapGestureRecognizer_Edit1" CommandParameter="{Binding ItemId}"/>
          </Grid.GestureRecognizers>

          <Label Text="{Binding ItemName}" Grid.Column="1" FontSize="Medium"></Label>
           
          <Image Source="DecreaseIcon1.png" Grid.Column="2" Margin="4" IsVisible="{Binding IsVisible}">
            <Image.GestureRecognizers>
              <TapGestureRecognizer Tapped="DecrementQuantity" CommandParameter="{Binding ItemId}"/>
            </Image.GestureRecognizers>
          </Image>

          <Entry Text="{Binding ItemQuantity}" Grid.Column="3" VerticalTextAlignment="Center"/>

          <Image Source="IncreaseIcon1.png" Grid.Column="4" Margin="4" IsVisible="{Binding IsVisible}">
            <Image.GestureRecognizers>
              <TapGestureRecognizer Tapped="IncrementQuantity" CommandParameter="{Binding ItemId}"/>
            </Image.GestureRecognizers>
          </Image>

        </Grid>
      </ViewCell>
    </DataTemplate>
  </ListView.ItemTemplate>
</ListView>

ItemsPage.cs

private void IncrementQuantity(object sender, EventArgs e)
  {
    TappedEventArgs tappedEventArgs = (TappedEventArgs)e;
    Item item = ((ItemViewModel)BindingContext).Items.Where(x => x.ItemId == (Guid)tappedEventArgs.Parameter).FirstOrDefault();

    var oldQuantity = item.ItemQuantity++;
  }

private void DecrementQuantity(object sender, EventArgs e)
  {
    TappedEventArgs tappedEventArgs = (TappedEventArgs)e;
    Item item = ((ItemViewModel)BindingContext).Items.Where(x => x.ItemId == (Guid)tappedEventArgs.Parameter).FirstOrDefault();

    var oldQuantity = item.ItemQuantity--;
  }

Grid lastGrid;
private void TapGestureRecognizer_Edit1(object sender, EventArgs e)
  {
    TappedEventArgs tappedEventArgs = (TappedEventArgs)e;
    Item item = ((ItemViewModel)BindingContext).Items.Where(x => x.ItemId == (Guid)tappedEventArgs.Parameter).FirstOrDefault();
    _item = item;

    var grid = sender as Grid;
    lstView.SelectedItem = grid.BindingContext;

    if (lastGrid != null)
    {
    lastGrid.BackgroundColor = Color.Transparent;
    }
    var viewCell = (Grid)sender;
    if (viewCell.BackgroundColor != null)
    {
    viewCell.BackgroundColor = Color.LightGray;
    lastGrid = viewCell;
    }
  }