WPF - 无法在窗口中显示ObservableCollection

Question

我有一个ObservableCollection，我似乎无法在窗口中显示。下面是代码：

视图模型：

public class QueryParamsVM : DependencyObject 
{ 
    public string Query { get; set; } 

    public QueryParamsVM() 
    { 
     Parameters = new ObservableCollection<StringPair>(); 
    } 

    public ObservableCollection<StringPair> Parameters 
    { 
     get { return (ObservableCollection<StringPair>)GetValue(ParametersProperty); } 
     set { SetValue(ParametersProperty, value); } 
    } 

    // Using a DependencyProperty as the backing store for Parameters. This enables animation, styling, binding, etc... 
    public static readonly DependencyProperty ParametersProperty = 
     DependencyProperty.Register("Parameters", typeof(ObservableCollection<StringPair>), typeof(QueryParamsVM), new UIPropertyMetadata(null)); 
} 


public class StringPair: INotifyPropertyChanged 
{ 
    public string Key { get; set; } 
    public string Value 
    { 
     get { return _value; } 
     set { _value = value; OnPropertyChanged("IsVisible"); } 
    } 
    private string _value; 

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

的窗口XAML：

<Window x:Class="WIAssistant.QueryParams" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    Title="Query Parameters" Height="390" Width="504"> 

    <Grid> 
     <ListBox DataContext="{Binding Parameters}" > 

      <ListBox.ItemTemplate> 
       <DataTemplate> 
        <StackPanel> 
         <TextBlock Text="{Binding Key}" ></TextBlock> 
         <TextBlock Text="{Binding Value}"></TextBlock> 
        </StackPanel> 
       </DataTemplate> 
      </ListBox.ItemTemplate> 
     </ListBox>   
    </Grid> 
</Window> 

调用代码：

// Get Project Parameters 
QueryParams queryParams = new QueryParams(); 
queryParams.ViewModel.Parameters.Add(new StringPair {Key = "@project", Value = ""}); 
queryParams.ShowDialog(); 

我试图把调试语句中绑定。该参数被绑定到，但值绑定永远不会被调用。

有关如何让我的列表显示的任何想法？

Answer 1

尝试

<ListBox ItemsSource="{Binding Parameters}"> 

或

<ListBox DataContext="{Binding Parameters}" ItemsSource="{Binding}"> 

Answer 2

一个奇怪的位置：

public string Value 
{ 
    get { return _value; } 
    set { _value = value; OnPropertyChanged("IsVisible"); } 
} 

你在一个不同的属性提升一个属性更改事件。应该可能是：

public string Value 
{ 
    get { return _value; } 
    set { _value = value; OnPropertyChanged("Value"); } 
}