Question

我有一个数据网格填充数据，其中一个列存储项目的ID。如果有行在id中有省略，我需要突出显示它们，例如：row1有id = 40，row2有id = 42，id = 41是missind。我能以某种方式使用datatriggers或类似的东西实现这个吗？

Answer 1

罗德里戈席尔瓦的建议很好，如果可以，那就这么做。如果您不能/不想 - 这是使用DataTrigger实现此目的的一种方式：

XAML：

<Window x:Class="WpfApplication4.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:app="clr-namespace:WpfApplication4"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <DataGrid ItemsSource="{Binding list}">
            <DataGrid.Resources>
                <app:MissingRowCheckConverter x:Key="MissingRowCheckConverter" />
                <Style TargetType="DataGridRow">
                    <Style.Triggers>
                        <DataTrigger Value="True">
                            <DataTrigger.Binding>
                                <MultiBinding Converter="{StaticResource MissingRowCheckConverter}">
                                    <Binding RelativeSource="{RelativeSource Self}" Path="Item" />
                                    <Binding RelativeSource="{RelativeSource AncestorType=DataGrid}" Path="ItemsSource" />
                                </MultiBinding>
                            </DataTrigger.Binding>
                            <Setter Property="Background" Value="Red" />
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </DataGrid.Resources>
        </DataGrid>
    </Grid>
</Window>

代码背后：

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApplication4
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public ObservableCollection<MyData> list { get; set; }

        public MainWindow()
        {
            InitializeComponent();
            list = new ObservableCollection<MyData>();
            for (int i = 1; i <= 100; i++)
            {
                if (i == 3)
                    continue;
                MyData d = new MyData() { id = i, name = "Name " + i.ToString() };
                list.Add(d);
            }
            DataContext = this;
        }
    }

    public class MyData
    {
        public int id { get; set; }
        public string name { get; set; }
    }

    public class MissingRowCheckConverter : IMultiValueConverter
    {
        #region IMultiValueConverter Members

        public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            if (values.Length > 1)
            {
                MyData d = values[0] as MyData;
                if (d == null)
                    return false;

                ObservableCollection<MyData> list = values[1] as ObservableCollection<MyData>;
                if (list != null)
                {
                    // Check if any in the list have id - 1
                    if (list.Any(aa => aa.id == (d.id - 1)))
                        return false;
                    // Check if this is the lowest id
                    if (!list.Any(aa => aa.id < d.id))
                        return false;
                }
            }
            return true;
        }

        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }

        #endregion
    }
}

截图：

Screenshot

wpf datagrid。突出显示行，它们之间省略了数据

1 个答案: