Silverlight 3 - 如何“刷新”DataGrid内容？

Question

我有以下的风光：

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...

的问题是：如何获得再增加一个寄存器到我的清单后更新了UI。

我去解决它设置DataGrid的物品来源为“”，然后设置为客户对象的名单再次，这样的：

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 

是否有一种方式来获得更新的用户界面或DataGrid的itemsSource在更新，更改或删除列表c中的项目后自动刷新？

谢谢

Josimari Martarelli

Answer 1

我建议考虑结合，INotifyPropertyChanged的，DataContexts和的ObservableCollection。

1. 更改您的List到ObservableCollection。这本身就可能会解决一些你的问题......作为ObservableCollection不仅仅是一个简单的List

2. 多了几分稳健但是，如果你想解决更多的问题是这样，你会看着你的DataGrid绑定到您的通过XAML <DataGrid... ItemsSource="{Binding MyList}">

3. 对象列表为了绑定你DataGrid您List，你将需要设置视图的DataContext。这可以是一个简单的放置在你的构造：this.DataContext = this;设置你的DataContext告诉视图到哪里找数据时，看到Binding声明

4. 然后，解决像一个你（改变的东西不刷新的问题该视图），您将在您的课堂上实施INotifyPropertyChanged界面。这将允许后面的代码向视图发送通知，以告知它何时更改。

下面是会实现这个C＃代码：

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)); 
     } 
    } 
}