我试图在WPF中更新我的BoundData。我的数据已显示,但我的用户界面并未对数据中的更改做出反应。
我的XAML类看起来像这样:
<Window x:Class="CSharpBoiler.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:util="clr-namespace:Wpf.Util"
Title="MainWindow" Loaded="Window_Loaded" Closing="Window_Closing" Height="Auto" Width="Auto"
DataContext="{Binding matchDataList, RelativeSource={RelativeSource Self}}">
<Grid>
<ListView
IsSynchronizedWithCurrentItem="True"
util:GridViewSort.AutoSort="True"
x:Name="MainListView" >
<ListView.View>
<GridView x:Name="MainGridView">
<GridView.Columns>
<GridViewColumn Header="Demo, press to Download"
util:GridViewSort.PropertyName="Demo"
x:Name="DemoGridViewColumn">
<GridViewColumn.CellTemplate>
<DataTemplate>
<DockPanel>
<ProgressBar x:Name="DemoButtonProgressbar"
Maximum="100" Minimum="0"
Value="{Binding AnalysisProgress,
UpdateSourceTrigger=PropertyChanged}" Width="100"/>
</DockPanel>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView.Columns>
</GridView>
</ListView.View>
</ListView>
</Grid>
MyMainWindow看起来像这样:
public partial class MainWindow : Window
{
private List<MatchData> matchDataList = new List<MatchData>();
public MainWindow()
{
InitializeComponent();
}
private void Window_Loaded(object sender, RoutedEventArgs e)
{
MainListView.ItemsSource = matchDataList;
}
在matchDataList中有许多MatchData对象,我想在ListViewGridView中表示它们。 MatchData如下所示:
public class MatchData : ObservableCollection<MatchData>, INotifyPropertyChanged
{
public int _AnalysisProgress;
public int AnalysisProgress
{
get { return _AnalysisProgress; }
set
{
_AnalysisProgress = value;
NotifyPropertyChanged("AnalysisProgress");
}
}
public PropertyChangedEventHandler PropertyChanged;
public void NotifyPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
此时,我的进度条显示在我的ListGridViewgridView构造中。我在代码中更改它的值以显示进度。当我更改AnalysisProgress的值时,NotifyPropertyChanged被正确调用。但PropertyChanged始终为null。
因此,不会触发任何事件,并且Progressbar的值不会更改。当我通过单击其中一个列标题刷新UI时,Progressbar显示正确的值。显然,我想让我的Progressbar显示当前进度而不点击它。
我对XAML Binding很陌生,并希望我没有犯很多根本性错误,因此我对如何使这些代码更好的所有其他提议持开放态度。我不太喜欢我访问ListViewGridview构造项的限制,但它是我找到的最好的表,它通过单击列标题进行排序。
答案 0 :(得分:0)
问题出在
public class MatchData : ObservableCollection<MatchData>, INotifyPropertyChanged
将其更改为
public class MatchData : INotifyPropertyChanged
在这样做并修复后,VS让我实现了接口
public PropertyChangedEventHandler PropertyChanged;
public void NotifyPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
到
public event PropertyChangedEventHandler PropertyChanged;
public void OnPropertyChanged(PropertyChangedEventArgs e)
{
if (PropertyChanged != null)
{
PropertyChanged(this, e);
}
}
和
public int _AnalysisProgress;
public int AnalysisProgress
{
get { return _AnalysisProgress; }
set
{
_AnalysisProgress = value;
NotifyPropertyChanged("AnalysisProgress");
}
}
到
public int _AnalysisProgress { get; set; }
public int AnalysisProgress
{
get { return _AnalysisProgress; }
set
{
_AnalysisProgress = value;
OnPropertyChanged(new PropertyChangedEventArgs("AnalysisProgress"));
}
}
一切都在按预期运行。