Silverlight 3 - 如何「刷新」DataGrid內容？

Question

我有以下的風光：

1 using System; 
2 using System.Windows; 
3 using System.Windows.Controls; 
4 using System.Windows.Documents; 
5 using System.Windows.Ink; 
6 using System.Windows.Input; 
7 using System.Windows.Media; 
8 using System.Windows.Media.Animation; 
9 using System.Windows.Shapes; 
10 using System.Collections.Generic; 
11 
12 namespace refresh 
13 { 
14  public partial class MainPage : UserControl 
15  { 
16   
17   List c = new List(); 
18 
19   public MainPage() 
20   { 
21    // Required to initialize variables 
22    InitializeComponent(); 
23    c.Add(new Customer{ _nome = "Josimari", _idade = "29"}); 
24    c.Add(new Customer{_nome = "Wesley", _idade = "26"}); 
25    c.Add(new Customer{_nome = "Renato",_idade = "31"});  
26    
27    this.dtGrid.ItemsSource = c; 
28   } 
29 
30   private void Button_Click(object sender, System.Windows.RoutedEventArgs e) 
31   { 
32    c.Add(new Customer{_nome = "Maiara",_idade = "18"}); 
33   } 
34   
35  } 
36  
37  public class Customer 
38  { 
39   public string _nome{get; set;} 
40   public string _idade{get; set;} 
41  } 
42 } 

其中，dtGrid是我的DataGrid控件...

的問題是：如何獲得再增加一個寄存器到我的清單後更新了UI。

我去解決它設置DataGrid的物品來源爲「」，然後設置爲客戶對象的名單再次，這樣的：

1 private void Button_Click(object sender, System.Windows.RoutedEventArgs e) 
2  
3 { 
4  
5 c.Add(new Customer{_nome = "Maiara",_idade = "18"}); 
6  
7 this.dtGrid.ItemsSource=""; 
8  
9 this.dtGrid.ItemsSource=c; 
10 
11 } 
12 

是否有一種方式來獲得更新的用戶界面或DataGrid的itemsSource在更新，更改或刪除列表c中的項目後自動刷新？

謝謝

Josimari Martarelli

Answer 1

我建議考慮結合，INotifyPropertyChanged的，DataContexts和的ObservableCollection。

1. 更改您的List到ObservableCollection。這本身就可能會解決一些你的問題......作爲ObservableCollection不僅僅是一個簡單的List

2. 多了幾分穩健但是，如果你想解決更多的問題是這樣，你會看着你的DataGrid綁定到您的通過XAML <DataGrid... ItemsSource="{Binding MyList}">

3. 對象列表爲了綁定你DataGrid您List，你將需要設置視圖的DataContext。這可以是一個簡單的放置在你的構造：this.DataContext = this;設置你的DataContext告訴視圖到哪裏找數據時，看到Binding聲明

4. 然後，解決像一個你（改變的東西不刷新的問題該視圖），您將在您的課堂上實施INotifyPropertyChanged界面。這將允許後面的代碼向視圖發送通知，以告知它何時更改。

下面是會實現這個C＃代碼：

public partial class MainPage : UserControl, INotifyPropertyChanged 
{ 
    private ObservableCollection<Customer> _MyList = 
     new ObservableCollection<Customer>(); 
    public ObservableCollection<Customer> MyList 
    { 
     get { return _MyList; } 
    } 

    public MainPage() 
    {      
     InitializeComponent(); 

     this.DataContext = this; 

     MyList.Add(new Customer{ _nome = "Josimari", _idade = "29"}); 
     MyList.Add(new Customer{_nome = "Wesley", _idade = "26"}); 
     MyList.Add(new Customer{_nome = "Renato",_idade = "31"}); 

     OnPropertyChanged("MyList"); // This only works if you use bindings. 
    } 

    private void Button_Click(object sender, System.Windows.RoutedEventArgs e) 
    { 
     MyList.Add(new Customer{_nome = "Maiara",_idade = "18"}); 

     OnPropertyChanged("MyList"); // This only works if you use bindings. 
    } 

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