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因爲我在一個非常困難的問題的工作時間：通知時，裏面收藏的變化
如何是DataGrid中綁定到一個的ObservableCollection正確更新當其他的ObservableCollection是裏面ObservableCollectionDataGrid必然會發生變化？
到目前爲止，當我點擊相應的單元格時，DataGrid只會刷新。
我已經準備了一個完整的源代碼的例子來說明以下的（非常簡單）情況：
有保持的列表的視圖模型。這個List是一個ObservableCollection，它包含兩個東西：一個整數和另一個List（同樣是一個ObservableCollection），它包含四個整數。 然後有一個DataGrid有兩列。一列用於整數列表，一列用於整數列表。 這個小應用程序有按鈕來修改嵌套列表中的整數，即將+1添加到四個整數中的一個。 目標是由嵌套列表的修改得到DataGrid的反映。 的問題到目前爲止，這僅在發生與外部觸發（例如，在對應的單元的點擊，或在一個列標題的點擊的排序列等）
因此，這裏是完整的代碼：
這是DataGrid綁定到視圖模型的代碼：
public class ViewModel: INotifyPropertyChanged {
private Items items;
public Items Items {
get { return items; }
set {
items = value;
firePropertyChanged("Items");
}
}
public ViewModel() {
Items = new Items();
}
private void firePropertyChanged(string property) {
if (PropertyChanged != null) {
PropertyChanged(this, new PropertyChangedEventArgs(property));
}
}
public event PropertyChangedEventHandler PropertyChanged;
}
public class Items: ObservableCollection<Item> {
public Items()
: base() {
this.CollectionChanged += new NotifyCollectionChangedEventHandler(OnCollectionChanged);
}
private void OnCollectionChanged(object o, NotifyCollectionChangedEventArgs e) {
if (e.NewItems != null) {
foreach (Object item in e.NewItems) {
(item as INotifyPropertyChanged).PropertyChanged += new PropertyChangedEventHandler(item_PropertyChanged);
}
}
if (e.OldItems != null) {
foreach (Object item in e.OldItems) {
(item as INotifyPropertyChanged).PropertyChanged -= new PropertyChangedEventHandler(item_PropertyChanged);
}
}
}
void item_PropertyChanged(object sender, PropertyChangedEventArgs e) {
NotifyCollectionChangedEventArgs a = new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset);
OnCollectionChanged(a);
}
}
public class List: ObservableCollection<NumberItem> {
public List()
: base() {
this.CollectionChanged += new NotifyCollectionChangedEventHandler(OnCollectionChanged);
}
private void OnCollectionChanged(object o, NotifyCollectionChangedEventArgs e) {
if (e.NewItems != null) {
foreach (Object item in e.NewItems) {
(item as INotifyPropertyChanged).PropertyChanged += new PropertyChangedEventHandler(item_PropertyChanged);
}
}
if (e.OldItems != null) {
foreach (Object item in e.OldItems) {
(item as INotifyPropertyChanged).PropertyChanged -= new PropertyChangedEventHandler(item_PropertyChanged);
}
}
}
void item_PropertyChanged(object sender, PropertyChangedEventArgs e) {
NotifyCollectionChangedEventArgs a = new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset);
OnCollectionChanged(a);
}
}
public class NumberItem : INotifyPropertyChanged {
private int number;
public int Number {
get { return number; }
set {
number = value;
firePropertyChanged("Number");
}
}
public NumberItem(int i) {
Number = i;
}
private void firePropertyChanged(string property) {
if (PropertyChanged != null) {
PropertyChanged(this, new PropertyChangedEventArgs(property));
}
}
public event PropertyChangedEventHandler PropertyChanged;
}
public class Item : INotifyPropertyChanged {
private List list;
public List List {
get { return list; }
set {
list = value;
firePropertyChanged("List");
}
}
private int numberOne;
public int NumberOne {
get { return numberOne; }
set {
numberOne = value;
firePropertyChanged("NumberOne");
}
}
private void firePropertyChanged(string property) {
if (PropertyChanged != null) {
PropertyChanged(this, new PropertyChangedEventArgs(property));
}
}
public event PropertyChangedEventHandler PropertyChanged;
}
/// <summary>
/// This converter simply transforms the list of integers into a string.
/// </summary>
public class Converter : IValueConverter {
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) {
List l = (List)value;
string s = "";
return s + l[0].Number + " " + l[1].Number + " " + l[2].Number + " " + l[3].Number;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) {
return null;
}
}
操縱的耐思特的整數按鈕的代碼d名單如下：
private void plus1L(object sender, RoutedEventArgs e) {
vm.Items[0].List[0].Number += 1;
}
最後這是在數據網格中得到綁定的XAML：你只需要火的List屬性時更改事件
<sdk:DataGrid x:Name="dg" Margin="17,139,21,0" ItemsSource="{Binding Items}" AutoGenerateColumns="False" VerticalAlignment="Top" Height="164" d:LayoutOverrides="Width, HorizontalMargin">
<sdk:DataGrid.Columns>
<sdk:DataGridTextColumn x:Name="A" Header="A" Binding="{Binding NumberOne}"/>
<sdk:DataGridTextColumn x:Name="List" Header="List" Binding="{Binding List, Converter={StaticResource Converter}}"/>
</sdk:DataGrid.Columns>
</sdk:DataGrid>*emphasized text*
大聲笑..看起來像你被搗毀@marc – 2012-02-07 18:24:58
是的，你告訴過我。我做了你告訴我的事情）但它仍然無法正常工作。以上是我完整的源代碼 - 如果我在將它包含在源代碼中之前幾個小時才能理解你。 – 2012-02-07 18:27:03
@Marc：查看編輯。 – 2012-02-07 18:31:18