1 <Window x:Class="WTest.MainWindow" 2  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 3  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 4  xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 5  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 6  xmlns:local="clr-namespace:WTest" 7  mc:Ignorable="d" 8  Title="MainWindow" Height="450" Width="800"> 9 <Window.Resources>10 <Style TargetType="DataGridCell">11 <Setter Property="Foreground" Value="{Binding StatusColor}" />12 </Style>13 </Window.Resources>14 <Grid>15 <Grid.RowDefinitions>16 <RowDefinition Height="*"></RowDefinition>17 <RowDefinition Height="30"></RowDefinition>18 </Grid.RowDefinitions>19 <DataGrid ItemsSource="{Binding Collects}">20 <DataGrid.Columns>21 <DataGridTextColumn Binding="{Binding Id}" Header="Id"/>22 </DataGrid.Columns>23 </DataGrid>24 <StackPanel Grid.Row="1" Orientation="Horizontal">25 <Button Content="获取数据" Command="{Binding GetData}" HorizontalAlignment="Left" Height="30" Width="75"/>26 <Button Content="修改第一条" Command="{Binding ChangeFirst}" HorizontalAlignment="Left" Height="30" Width="75"/>27 </StackPanel>28 </Grid>29 </Window>

 1 public class MainViewModel : BaseNotifyEntity 2  { 3 private ObservableCollection<TestModel> collects = new ObservableCollection<TestModel>(); 4 public ObservableCollection<TestModel> Collects { get => collects; set => NotifyPropertyChanged(nameof(Collects), ref collects, value); } 5  6  public DelegateCommand GetData => new DelegateCommand(async (o) => 7  { 8  var data = await Datas(); 9  int i = 0; 10  data.ForEach((item) => 11  { 12  //item.StatusColor如果为null那就可以直接add 13  //item.StatusColor不为null的时候这里为什么一定要重设颜色才不报错？，否则直接add就报错了 14  item.StatusColor = i % 2 == 0 ? new SolidColorBrush(Colors.Red) : new SolidColorBrush(Colors.Purple); 15  16  Collects.Add(item); 17  i++; 18  }); 19  }); 20  21 public async Task<List<TestModel>> Datas() 22  { 23  return await Task.Run(async () => 24  { 25  await Task.Delay(0); 26 List<TestModel> test = new List<TestModel>(); 27  Parallel.For(0, 10, (i) => 28  { 29  TestModel t = new TestModel() 30  { 31  Id = i, 32  }; 33  test.Add(t); 34  }); 35  return test; 36  }); 37  } 38  public DelegateCommand ChangeFirst => new DelegateCommand((o) => 39  { 40  if (Collects.Count > 0) 41  { 42  Collects[0].StatusColor = new SolidColorBrush(Colors.Pink); 43  } 44  }); 45  } 46  public class TestModel : BaseNotifyEntity//, ICloneable 47  { 48  public TestModel() 49  { 50  this.StatusColor = new SolidColorBrush(Colors.Red); 51  } 52  private int id; 53  public int Id { get => id; set => NotifyPropertyChanged(nameof(Id), ref id, value); } 54  55  private Brush statusColor; 56  public Brush StatusColor { get => statusColor; set => NotifyPropertyChanged(nameof(StatusColor), ref statusColor, value); } 57  58  //public object Clone() 59  //{ 60  // object obj = null; 61  62  // obj = new TestModel() 63  // { 64  // Id = this.Id, 65  // StatusColor = this.StatusColor 66  // }; 67  // return obj; 68  //} 69  } 70  public class BaseNotifyEntity : INotifyPropertyChanged 71  { 72  public event PropertyChangedEventHandler PropertyChanged; 73  public void NotifyPropertyChanged(string propertyName) 74  { 75  PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName)); 76  } 77 protected void NotifyPropertyChanged<T>(string propertyName, ref T field, T newValue = default) 78  { 79  field = newValue; 80  PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName)); 81  } 82  } 83 /// <summary> 84  /// 实现DelegateCommand 85 /// </summary> 86  public class DelegateCommand : ICommand 87  { 88 /// <summary> 89  /// 命令所需执行的事件 90 /// </summary> 91 public Action<object> ExecuteCommand { get; set; } 92  93  public DelegateCommand() 94  { 95  } 96 public DelegateCommand(Action<object> execute) 97  { 98  ExecuteCommand = execute; 99  }100 101 /// <summary>102  /// 命令可用性获取103 /// </summary>104 /// <param name="parameter"></param>105 /// <returns></returns>106  public bool CanExecute(object parameter)107  {108  return true;109  }110 111  public event EventHandler CanExecuteChanged112  {113  add { CommandManager.RequerySuggested += value; }114  remove { CommandManager.RequerySuggested -= value; }115  }116 117 /// <summary>118  /// 命令具体执行119 /// </summary>120 /// <param name="parameter"></param>121  public void Execute(object parameter)122  {123  ExecuteCommand(parameter);124  }125 }