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[英]Is there an equivalent of DependencyObjectCollection<T> for WPF .NET4.0?
[英]Notify changes in list wpf .net4.0
我正在嘗試將項目廣告到如下所示的列表,並更新DataGrid但似乎我遺漏了一些東西,我應該通知哪個屬性?
C#
public partial class Window8 : INotifyPropertyChanged
{
public TestObj TestObject { get; set; }
public int Count { get; set; }
public Window8()
{
InitializeComponent();
DataContext = this;
var newList = new List<Test>();
newList.Add(new Test{I = 1, S = "Test"});
TestObject = new TestObj { S = "Testing object", List = newList };
Count = TestObject.List.Count;
}
private ICommand _addItemCommand;
public ICommand AddItemCommand
{
get
{
if (_addItemCommand == null)
_addItemCommand = new RelayCommand(n =>
{
TestObject.List.Add(new Test {I = 1, S = "New object"});
Count = TestObject.List.Count;
NotifyPropertyChanged("TestObject");
//NotifyPropertyChanged("TestObject.List");
NotifyPropertyChanged("Count");
});
return _addItemCommand;
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected void NotifyPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
public class TestObj
{
public string S { get; set; }
public List<Test> List { get; set; }
}
public class Test
{
public string S { get; set; }
public int I { get; set; }
}
XAML
<StackPanel>
<Button Height="23" Width="100" Command="{Binding Path=AddItemCommand}" >Add Item</Button>
<DataGrid Height="100" ItemsSource="{Binding Path=TestObject.List}" IsReadOnly="True" />
<TextBlock Text="{Binding Path=Count}" />
當我按下按鈕我在列表中添加對象時,計數器會計數,但列表中沒有任何反應。
您應該使用ObservableCollection而不是List
代碼應該是 -
public Window8()
{
InitializeComponent();
DataContext = this;
var newList = new ObservableCollection<Test>();
newList.Add(new Test { I = 1, S = "Test" });
TestObject = new TestObj { S = "Testing object", List = newList };
Count = TestObject.List.Count;
}
public class TestObj
{
public string S { get; set; }
public ObservableCollection<Test> List { get; set; }
}
還應在不在窗口中的對象上實現INotifyPropertyChanged
你'對象'必須實現INotifyPropertyChanged
,而不是窗體或窗口。
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