Question

我使用自定义类填充ObservableCollection<>（也尝试了List<>）。我已将集合绑定到DataGrid并定义了列。现在我想选择一个单元格，并让其他单元格（在同一列中，尽管其他列中的数据不会匹配），其中有相同的字符串要突出显示。

<Window.Resources>
    <local:CellHighlighterConverter x:Key="cellHighlighterConverter" />
    <CollectionViewSource x:Key="ScanCollectionViewSource" CollectionViewType="ListCollectionView" />
    <Style x:Key="CenterCell" TargetType="TextBlock">
        <Setter Property="TextBlock.TextAlignment" Value="Center" />
    </Style>
    <Style x:Key="CellPad" TargetType="TextBlock">
        <Setter Property="Margin" Value="15,0,15,0" />
    </Style>
    <Style x:Key="CellHighlighterStyle" TargetType="TextBlock" >
        <Setter Property="Background" Value="{Binding IsMatching, NotifyOnSourceUpdated=True, Converter={StaticResource cellHighlighterConverter}}" />
        <Setter Property="TextBlock.TextAlignment" Value="Center" />
    </Style>
</Window.Resources>
<Grid HorizontalAlignment="Center" >
    <DataGrid x:Name="scans" DataContext="{StaticResource ScanCollectionViewSource}" ItemsSource="{Binding}" AutoGenerateColumns="False" FontFamily="Lucida Console" Margin="10" MouseUp="scans_MouseUp" >
        <DataGrid.Columns>
            <DataGridTextColumn Header="Device Name" Binding="{Binding Hostname}" Width="125" />
            <DataGridTextColumn Header="Scan Date" Binding="{Binding ScanDate}" Width="75" ElementStyle="{StaticResource CenterCell}" />
            <DataGridTextColumn Header="GUID" Binding="{Binding GUID}" Width="300" ElementStyle="{StaticResource CenterCell}" />
            <DataGridTextColumn Header="MAC" Binding="{Binding MAC}" Width="105" ElementStyle="{StaticResource CellHighlighterStyle}" />
        </DataGrid.Columns>
    </DataGrid>
</Grid>

背后的代码

private ObservableCollection<Scan> ReadFiles()
    {
        scanList = new List<Scan>();
        ...
        foreach(string file in files)
        {
            Scan newScan = new Scan();
            ...fill newScan with data
            scanList.Add(newScan);
        }
        scanList = scanList.OrderBy(x => x.Hostname).ThenByDescending(x => x.ScanDate).ToList();
        scanCollection = new ObservableCollection<Scan>(scanList);
        return scanCollection;        
   }

我试图做到这一点的方式。向类添加了一个属性，然后在鼠标向上时，如果数据匹配（这可以），则设置该属性，然后使用转换器根据该数据设置背景。网格不刷新或其他错误。我是在正确的轨道还是有更好的方法？

private void scans_MouseUp(object sender, MouseButtonEventArgs e)
    {
        string selMAC = ((Scan)((DataGrid)sender).SelectedValue).MAC;
        foreach (Scan scan in scanList)//((DataGrid)sender).Items.OfType<Scan>().ToList() )
        {
            // compare values
            if (scan.MAC == selMAC)
            {
                scan.IsMatch = true;
            } else
            {
                scan.IsMatch = false;
            }
            //scans.Items.Refresh();
        }
    }
}

public class CellHighlighterConverter : IValueConverter
{

    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if( (Boolean)value )
        {
            return new SolidColorBrush(Colors.Green);
        }
        return SystemColors.AppWorkspaceColor;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}


public class Scan
{
    public Scan()
    {
        this.IsMatch = false;
    }

    public string Hostname { get; set; }
    public string ScanDate { get; set; }
    public string GUID { get; set; }
    public string MAC { get; set; }
    public bool IsMatch { get; set; }
}

Answer 1

Scan应该实现INotifyPropertyChanged接口，并为IsMatch属性提出通知：

private bool _IsMatch;
public bool IsMatch 
{
    get { return _IsMatch; }
    set 
    { 
         if (_IsMatch == value) return;
         _IsMatch = value;
         OnPropertyChanged("IsMatch");
    }
}

没有这样的通知即使您更改了IsMatch，也不会触发转换方法。

我会解决的其他事情：

Convert方法应返回Brush，而不是Color

{
    return (bool)value ? Brushes.Green : SystemColors.AppWorkspaceBrush;
}

使用SelectionChanged事件代替MouseUp。 MouseUp可以多次出现在同一个单元格上，每次都不需要搜索mathes

WPF DataGrid突出显示与所选单元格匹配的列中的所有单元格

1 个答案: