我使用的是C# WPF
我有一个Datagrid，其中填充了一个可观察的集合，该集合名为：“ALLTASKLIST”填充从数据库中选择数据
我使用DataBinding在DataGrid中显示“ALLTASKLIST”中的数据
但它是空的！
XAML文件：<DataGrid.Columns>

<DataGridComboBoxColumn Header="CMB">
                <DataGridComboBoxColumn.EditingElementStyle>
                    <Style TargetType="ComboBox">
                        <Setter Property="ItemsSource" Value="{Binding Path=ALLTASKLIST}" />
                        <Setter Property="DisplayMemberPath" Value="NAMES" />
                        <Setter Property="SelectedValuePath" Value="CODE" />
                    </Style>
                </DataGridComboBoxColumn.EditingElementStyle>
            </DataGridComboBoxColumn>
        </DataGrid.Columns>

       
    </DataGrid>

后面的代码：

public partial class MainWindow : Window
    {
        NEGIN1401Entities dbms = null;
        public class ThePart1 : INotifyPropertyChanged
        {
            private int? _CODE;
            private string _NAMES;
            private int? _KIND;
            private int? _idd;
            public int? CODE
            {
                get { return _CODE; }
                set
                {
                    _CODE = value;
                    OnPropertyChanged("CODE");
                }
            }
            public string NAMES
            {
                get { return _NAMES; }
                set
                {
                    _NAMES = value;
                    OnPropertyChanged("NAMES");
                }
            }
            public int? KIND
            {
                get { return _KIND; }
                set
                {
                    _KIND = value;
                    OnPropertyChanged("KIND");
                }
            }
            public int? idd
            {
                get { return _idd; }
                set
                {
                    _idd = value;
                    OnPropertyChanged("idd");
                }
            }
            public event PropertyChangedEventHandler PropertyChanged;
            public void OnPropertyChanged(string strCaller = null)
            {
                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(strCaller));
            }
        }
        //public ObservableCollection<ThePart1> ALLTASKLIST { get; set; }
        public ObservableCollection<ThePart1> ALLTASKLIST = new ObservableCollection<ThePart1>();
        public MainWindow()
        {
            InitializeComponent();
            DataContext = this;
        }
        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            dbms = new NEGIN1401Entities(Publications.TheENTTConnectionString);

            ALLTASKLIST = dbms.Database.SqlQuery<ThePart1>("SELECT * FROM TCOD_ANBAR").ToObservableCollection();
            var IsHaveItems = ALLTASKLIST.Count;//it will be 6 Items
            //MainDatagrid.ItemsSource = ALLTASKLIST;

        }
    }

数据网格的项目：enter image description here
结果：enter image description here