20170922

gistfile1.txt

[xaml.cs]

    public partial class MainWindow : Window
    {

        public MainWindow()
        {
            InitializeComponent();
            DataContext = this;

            #region emp init
            //初始化這邊可以加到UI上 
            Employees = new ObservableCollection<Employee>
            {
                new Employee { FirstName = "FirstName1", LastName = "LastName1", HireDate = new DateTime(1970, 1, 1) },
                new Employee { FirstName = "FirstName2", LastName = "LastName2", HireDate = new DateTime(1970, 1, 1) },
                new Employee { FirstName = "FirstName3", LastName = "LastName3", HireDate = new DateTime(1980, 1, 1) },
                new Employee { FirstName = "FirstName4", LastName = "LastName4", HireDate = new DateTime(1980, 1, 1) },
                new Employee { FirstName = "FirstName5", LastName = "LastName5", HireDate = new DateTime(1980, 1, 1) },
                new Employee { FirstName = "FirstName6", LastName = "LastName6", HireDate = new DateTime(1990, 1, 1) },
                new Employee { FirstName = "FirstName7", LastName = "LastName7", HireDate = new DateTime(1990, 1, 1) },
                new Employee { FirstName = "FirstName8", LastName = "LastName8", HireDate = new DateTime(1990, 1, 1) },
                new Employee { FirstName = "FirstName9", LastName = "LastName9", HireDate = new DateTime(1990, 1, 1) },
            };
            #endregion

            /// 把Resource改到這裡
            EmployeesSource = 
                CollectionViewSource.GetDefaultView(Employees) ;
            EmployeesSource.GroupDescriptions.Add(new PropertyGroupDescription("HireDate"));
        }

        public ObservableCollection<Employee> Employees { get; set; }


        /// <summary>
        /// 把Resource改到這裡
        /// </summary>
        private ICollectionView EmployeesSource
        {
            get { return _employeesSource; }
            set { _employeesSource = value; }
        }
        private ICollectionView _employeesSource;


        private void addItem_Click(object sender, RoutedEventArgs e)
        {
            //有增加進去, 但是UI不會新增這一筆1983的資料
            Employees.Add(new Employee
            {
                FirstName = "FirstName10",
                LastName = "LastName10",
                HireDate = new DateTime(1983, 1, 1)
            });
            Employees.Add(new Employee
            {
                FirstName = "FirstName10",
                LastName = "LastName10",
                HireDate = new DateTime(1990, 1, 1)
            });

        }
    }


[ cs 測試留Employee即可 ]

    public class Employee : INotifyPropertyChanged
    {

        private string _firstName;
        public string FirstName
        {
            get { return _firstName; }
            set
            {
                _firstName = value;
                NotifyPropertyChanged("FirstName");
            }

        }
        private string _lastName;
        public string LastName
        {
            get { return _lastName; }
            set
            {
                _lastName = value;
                NotifyPropertyChanged("LastName");
            }
        }

        private DateTime _hireDate;
        public DateTime HireDate
        {
            get { return _hireDate; }
            set
            {
                _hireDate = value;
                NotifyPropertyChanged("HireDate");
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;
        protected void NotifyPropertyChanged(string sProp)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(sProp));
            }
        }
    }

[xaml  resource不須宣告collection resource 改在xaml.cs完成]
   <Window.Resources>
        <DataTemplate x:Key="EmployeeTemplate">
            <StackPanel Orientation="Horizontal">
                <TextBlock Text="{Binding FirstName}" />
                <TextBlock Text="{Binding LastName}" />
            </StackPanel>
        </DataTemplate>
    </Window.Resources>

    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="50"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

        <StackPanel Grid.Row="0">
            <Button Name="addItem" Width="50" Height="50" Content="AddItem"  HorizontalAlignment="Left" Click="addItem_Click"/>
        </StackPanel>

        <ListBox Grid.Row="1" ItemsSource="{Binding Employees}"
         ItemTemplate="{StaticResource EmployeeTemplate}"
         SelectionMode="Extended">
            <ListBox.GroupStyle>
                <GroupStyle/>
            </ListBox.GroupStyle>
        </ListBox>
    </Grid>