WPF DataGrid CheckBox 多选 反选 全选

   "CheckBoxDataTemplate">
            CheckBox
                             Click="CheckBox_Checked"
                              Uid="{Binding id}"
                            IsChecked="{Binding IsSelect , Mode=TwoWay}">
                
            "TST"  >
            "{StaticResource  CheckBoxStyle}"  Header="选择">
                    "全选" Uid="-1" Click="CheckBox_Checked"/>
                        "15*" Header="顺序" Binding="{Binding id}" />
            

 public class TEST : INotifyPropertyChanged
        {
            public event PropertyChangedEventHandler PropertyChanged;
            private bool? isSelect;
            public int id { get; set; }
            public bool? IsSelect
            {
                get { return isSelect; }
                set
                {
                    isSelect = value; OnChanged(new PropertyChangedEventArgs("IsSelect"));
                }
            }

            protected void OnChanged(PropertyChangedEventArgs arg)//具体方法
            {
                PropertyChanged?.Invoke(this, arg);
            }
        }

    ObservableCollection ts = new ObservableCollection();

        public MainWindow()
        {
            InitializeComponent();

            TST.AutoGenerateColumns = false;

            TST.CanUserAddRows = false;
            for (var i = 0; i 100; i++)
            {
                ts.Add(new TEST() { IsSelect = false, id = i });
            }
            TST.ItemsSource = ts;

        }


        private void CheckBox_Checked(object sender, RoutedEventArgs e)
        {
            var Check = (sender as CheckBox);

            var CUID = int.Parse(Check.Uid);

            //全选
            if (CUID==-1)
            {
                foreach (var item in ts)
                    item.IsSelect = true;
                Check.Uid = "-2";
                return;
            }
            //全否选
            if (CUID==-2)
            {
                foreach (var item in ts)
                    item.IsSelect = false;
                Check.Uid = "-1";
                return;
            }

            var IsSelcted = ts[CUID].IsSelect;

            ts[CUID].IsSelect = (IsSealed ? false : true);

            var IsSelects = from s in ts
                            where s.IsSelect == true
                            select s;

            if(IsSelects.Count()==5)
            {
                var Text = String.Empty;
                foreach (var ITEM in IsSelects)
                    Text += ITEM.id + " \n";

                MessageBox.Show(Text);
            }

        }