C＃如何編碼集合的EnableCollectionSynchronization

我已經搜索了整個互聯網尋找解決方案沒有結果。在我的程序中，我有UI線程顯示在兩個DataGrids Customers和Orders中。訂單顯示給選定的客戶。收藏的定義及其更新發生在後臺。 UI目的只是爲了顯示最新的信息。我利用了C＃4.5中引入的最新功能：BindingOperations.EnableCollectionSynchronization方法。在我的程序中，我有定義客戶類集合的類客戶。反過來，Customer類定義了Order類的集合。我的問題是我不知道如何正確編碼下面的代碼的最後一行，它涉及到Order集合綁定同步。這段代碼被簡化了，我省略了OnPropertyChange代碼行，以確保在數據網格中顯示正確的屬性 - 我想關注集合。C＃如何編碼集合的EnableCollectionSynchronization

public class Customers() 
    { 
     private ObservableCollection<Customer> _customerslist; 
     public ObservableCollection<Customer> customerslist 
     {get { 
      if (_customerslist == null) 
      {_customerslist = new ObservableCollection<Customer>();} 
      return _customerslist; 
     }private set 
     {_customerslist = value;}} 
    } 

    public class Customer 
    { 
     public customerID; 
     public customerName; 
     ..... 
     private ObservableCollection<Order> _orderslist; 
     public ObservableCollection<Order> orderslist 
     {get {if (_orderslist == null) 
      {_orderslist = new ObservableCollection<Order>();} 
      return _orderslist; 
     } private set 
     {_orderslist = value;}} 
    } 

public class MainWindow : Window 
{ 
    private static object _syncLockCustomers = new object(); 
    private static object _syncLockOrders = new object(); 

    public MainWindow() 
    { 
    InitializeComponent(); 
    } 

    private void Window_Loaded(object sender, RoutedEventArgs e) 
    { 
    var firstCustomer = Customers.customerslist.FirstOrDefault(); 

     custDataGrid.DataContext = Customers.customerslist; 
     if (firstCustomer != null) 
     { 
      custDataGrid.SelectedItem = firstCustomer; 
      ordersDataGrid.DataContext = firstCustomer.Orders.orderslist; 
     } 
BindingOperations.EnableCollectionSynchronization(Customers.customerslist, _syncLockCustomers); 

BindingOperations.EnableCollectionSynchronization(Orders <-what should be here ?, _syncLockOrders); 
}

}

來源

2015-09-04 Zibi

移動訂單的同步對象，以您的客戶類，使之成爲公共領域，並啓用您創建的每個客戶對象的同步。

public class Customer 
{ 
    public customerID; 
    public customerName; 
    public object _syncLockOrders = new object(); 
    ..... 
    private ObservableCollection<Order> _orderslist; 
    public ObservableCollection<Order> orderslist 
    { 
     get 
     { 
      if (_orderslist == null) 
      { 
       _orderslist = new ObservableCollection<Order>(); 
      } 
      return _orderslist; 
     } 
     private set {_orderslist = value;}} 
    } 
} 

public class MainWindow : Window 
{ 
    ... 

    private void Window_Loaded(object sender, RoutedEventArgs e) 
    { 
     var firstCustomer = Customers.customerslist.FirstOrDefault(); 

     custDataGrid.DataContext = Customers.customerslist; 
     if (firstCustomer != null) 
     { 
      custDataGrid.SelectedItem = firstCustomer; 
      ordersDataGrid.DataContext = firstCustomer.Orders.orderslist; 
     } 
.... 
     BindingOperations.EnableCollectionSynchronization(firstCustomer.ordersList, firstCustomer._syncLockOrders); 
}

來源

2015-09-04 17:14:07 WasGoodDone

如何在非UI類中添加BindingOperations.EnableCollectionSynchronization？它返回一個錯誤，說「BindingOperations在當前上下文中不存在」 – Zibi

System.Windows.Data命名空間的BindingOperations類部分，因此您需要對PresentationFramework.dll的引用。 – WasGoodDone

它似乎沒有工作。讓我/以前的解決方案到位，我可以看到所有客戶的名單 - 現在，他們也不可見。還有其他解決方案嗎？我還希望分離UI和操作/數據層。 – Zibi

考慮這個：

// Lock object for synchronization; 
private readonly object _syncLock = new object(); 

/// <summary> 
/// Initializes a new instance of MainWindow.  
/// </summary> 
public MainWindow() 
{ 
    InitializeComponent(); 

    // Sync collection with UI 
    BindingOperations.CollectionRegistering += BindingOperations_CollectionRegistering; 
} 

/// <summary> 
/// Handles the CollectionRegistering event of the BindingOperations control. 
/// </summary> 
/// <param name="sender">The source of the event.</param> 
/// <param name="e">The <see cref="CollectionRegisteringEventArgs"/> instance containing the event data.</param> 
private void BindingOperations_CollectionRegistering(object sender, CollectionRegisteringEventArgs e) 
{ 
    // Ensure collection exists 
    if (Customers == null || Customers.customerslist == null) return; 

    // Ensure collection is synched with UI 
    var myCollection = Customers.customerslist; 
    if (!Equals(e.Collection, myCollection)) return; 
    BindingOperations.EnableCollectionSynchronization(myCollection, _syncLock); 
}

現在收集每個有更新的時間被適當地同步。

來源

2015-11-28 16:44:21 Xcalibur37

C＃如何編碼集合的EnableCollectionSynchronization

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