Question

我有我的对象集合：

public class Data
{
   string name {get; set;}
   int progres {get; set;}
}

public ObservableCollection<Data> dataFiles { get; set; }

我的ListView：

    <ListView Name="lvDataFiles" 
              ItemsSource="{Binding dataList}">
        <ListView.ItemContainerStyle>
            <Style TargetType="{x:Type ListViewItem}">
                <Setter Property="Foreground" Value="White"/>
            </Style>
        </ListView.ItemContainerStyle>
        <ListView.Resources>
            <DataTemplate x:Key="MyDataTemplate">
                <Grid Margin="-6">
                    <ProgressBar Name="prog" Maximum="100" Value="{Binding Progress}" 
                                 Width="{Binding Path=Width, ElementName=ProgressCell}" 
                                 Height="16" Margin="0" Foreground="#FF5591E8" Background="#FF878889" />
                    <TextBlock Text="{Binding Path=Value, ElementName=prog, StringFormat={}{0}%}" VerticalAlignment="Center"
                               HorizontalAlignment="Center" FontSize="11" Foreground="White" />
                </Grid>
            </DataTemplate>
            <ControlTemplate x:Key="ProgressBarTemplate">
                <Label  HorizontalAlignment="Center" VerticalAlignment="Center" />
            </ControlTemplate>
        </ListView.Resources>
        <ListView.View>
            <GridView ColumnHeaderContainerStyle="{StaticResource ListViewHeaderStyle}">
                <GridViewColumn Width="425" Header="File name" DisplayMemberBinding="{Binding FileName}" />
                <GridViewColumn x:Name="ProgressCell"  Width="50" Header="Progress"
                                CellTemplate="{StaticResource MyDataTemplate}" />
            </GridView>
        </ListView.View>
    </ListView>

我的ListView有2列：文件名和进度（包含进度条）我的数据集合具有每隔几秒钟更改一次的Progress属性。

我的ListView ProgressBar是否有可能在每次特定对象（或多个同时......）发生变化时自动更新？或者我需要查看我的收藏并更新？

Answer 1

您的Data类必须从INotifyPropertyChanged继承，添加NotifyPropertyChange方法并为每个setter调用它。

public class Data : INotifyPropertyChanged
{
   private string _name;
   public string name
   {
      get { return _name; }
      set
      {
          _name= value;
          NotifyPropertyChanged("name");
      }
   }
   private int _progress;
   public int progress 
   {
      get { return _progress; }
      set
      {
          _progress = value;
          NotifyPropertyChanged("progress");
      }
   }

   public event PropertyChangedEventHandler PropertyChanged;

   virtual public void NotifyPropertyChange( string propertyName )
   {
       var handler = PropertyChanged;
       if (handler != null)
           handler(this, new PropertyChangedEventArgs(propertyName));
   }
}

WPF：如何在ListView中自动更新ObservableCollection

1 个答案: