有几种方法可以实现这一点。
一个简单的方法是向ListView的项添加一个字段，并将其绑定到该项的BackgroundColor，例如：

public Color BgColor { get; set; } = Color.Yellow;

我创建了一个简单的demo并实现了这个功能，可以参考下面的代码：

• • 项目. cs**

public class Item: INotifyPropertyChanged 
    {
        public Color BgColor { get; set; } = Color.Yellow;

        private string _numType;
        public string NumType
        {
            get => _numType;
            set
            {
                SetProperty(ref _numType, value);

                setBgColor();// set BgColor
            }
        }

        private void setBgColor()
        {
            if (NumType != null && NumType.Equals("S")) {
                BgColor = Color.Green;
            }
        }

        public string LocationCode { get; set; }

        public string Barcode { get; set; }
        public string UserName { get; set; }

        public string PickingAdjustementDate { get; set; }

        bool SetProperty<T>(ref T storage, T value, [CallerMemberName] string propertyName = null)
        {
            if (Object.Equals(storage, value))
                return false;

            storage = value;
            OnPropertyChanged(propertyName);
            return true;
        }

        protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

        public event PropertyChangedEventHandler PropertyChanged;
    }

• • 我的视图模型. cs**

public class MyViewModel 
    {
        public ObservableCollection<Item> Items { get; set; }

        public MyViewModel() { 
         Items = new ObservableCollection<Item>();

            Items.Add( new Item { NumType = "S" , LocationCode = "0001"});
            Items.Add(new Item { NumType = "M", LocationCode = "0002" });
            Items.Add(new Item { NumType = "L", LocationCode = "0003" });

        }
    }

• • 主页. xaml**

<?xml version="1.0" encoding="utf-8" ?> 
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" 
             xmlns:xamlistviewapp131="clr-namespace:XamListViewApp131"
             x:Class="XamListViewApp131.MainPage">

    <ContentPage.BindingContext>
        <xamlistviewapp131:MyViewModel></xamlistviewapp131:MyViewModel>
    </ContentPage.BindingContext>

    <StackLayout>
        <ListView Grid.Row="1" x:Name="gridViewAwaitingAdjustmentDetails"  ItemsSource="{Binding Items}"  >
            <!--Style="{StaticResource ListViewItemHighlighted}">-->
            <ListView.ItemTemplate>
                <DataTemplate>
                    <ViewCell>
                        <Grid BackgroundColor="{Binding BgColor}">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="70"/>
                                <ColumnDefinition Width="100"/>
                                <ColumnDefinition Width="80"/>
                                <ColumnDefinition Width="80"/>
                                <!--<ColumnDefinition Width="300" />-->
                            </Grid.ColumnDefinitions>

                            <Label Grid.Row="0" Grid.Column="0" Text="{Binding NumType}" Margin="0,0,0,0" />
                            <Label Grid.Row="0" Grid.Column="0" Text="{Binding LocationCode}"  Margin="0,0,0,0" />
                            <Label Grid.Row="0" Grid.Column="1" Grid.RowSpan="2" Text="{Binding Barcode}"  Margin="0,0,0,0" />
                            <Label Grid.Row="0" Grid.Column="2" Text="{Binding UserName}"  Margin="0,0,0,0" />
                            <Label Grid.Row="0" Grid.Column="3" Grid.RowSpan="2" Text="{Binding PickingAdjustementDate}"  Margin="0,0,0,0" />

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

</ContentPage>