WPF DataGrid动态样式

Question

我在一个WPF应用程序中有一个DataGrid控件。我希望能够在运行时从组合框中选择一个值，单击一个按钮并突出显示DataGrid中满足此条件的所有行的背景色。在后面的代码中，在Windows窗体中很容易做到这一点，但我无法在WPF中理解它。

感谢您给予的任何帮助。谢谢

Answer 1

你好，我创建了一个示例，它通过使用触发器和值转换器来解决这个问题。基本上，我在网格单元格上有一个触发器，它绑定到组合框的selecteditem。当您更改选择时，触发器将触发，单元格将使用valueconverter来查看selecteditem是否与网格单元格的值相同。

MainWindow.xaml

<Window x:Class="ComboBoxFilter.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:ComboBoxFilter="clr-namespace:ComboBoxFilter" Title="MainWindow" Height="350" Width="525">
<Window.Resources>
    <ComboBoxFilter:NameValueConverter x:Key="NameValueConverter" />
</Window.Resources>
<Grid>
    <StackPanel>
        <ComboBox ItemsSource="{Binding Names}" SelectedItem="{Binding SelectedPerson, Mode=TwoWay}" x:Name="TheComboBox" />
        <DataGrid AutoGenerateColumns="True" ItemsSource="{Binding Names}" x:Name="DataGrid"  >
            <DataGrid.CellStyle>
                <Style TargetType="{x:Type DataGridCell}">
                    <Style.Triggers>
                        <DataTrigger Value="True" >
                            <DataTrigger.Binding>
                                <MultiBinding Converter="{StaticResource NameValueConverter}">
                                    <Binding Path="SelectedItem.Name" ElementName="TheComboBox" Mode="TwoWay" />
                                    <Binding Path="Name"  />                                        
                                </MultiBinding>
                            </DataTrigger.Binding>
                            <Setter Property="Background" Value="Green" />
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </DataGrid.CellStyle>
        </DataGrid>
    </StackPanel>
</Grid>

​

MainWindow代码隐藏文件

namespace ComboBoxFilter
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            DataContext = new ViewModel();
        }

    }
}

NameValueConverter

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Windows.Data;

namespace ComboBoxFilter
{
    public class NameValueConverter : IMultiValueConverter
    {
        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
        {
            var string1 = values[0];
            var string2 = values[1];
            return string1 == string2;
        }

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

ViewModel

using System.Collections.ObjectModel;
using System.ComponentModel;

namespace ComboBoxFilter
{
    public class ViewModel : INotifyPropertyChanged
    {
        public ViewModel()
        {
            Names = new ObservableCollection<Person>
                        {
                            new Person {Name = "Andy"},
                            new Person {Name = "hkon"},
                            new Person {Name = "dandy"},
                            new Person {Name = "Andy"}
                        };
        }

        private Person _selectedPerson;
        public Person SelectedPerson
        {
            get { return _selectedPerson; }
            set { _selectedPerson = value; NotifyPropertyChanged("SelectedPerson"); }
        }

        public ObservableCollection<Person> Names { get; set; }

        public event PropertyChangedEventHandler PropertyChanged;
        public void NotifyPropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }
    }
    public class Person
    {
        public string Name { get; set; }

        public override string ToString()
        {
            return Name;
        }
    }
}