带有DateTime比较的WPF DataTrigger/Setter

Question

我只是想知道是否可以与WPF进行DATETIME比较,理想情况下我想根据它与当前日期的相关性来为我的数据网格着色.红色为过去的文件,绿色为未来.谢谢你的帮助!

<dg:DataGrid Name="files_datagrid" DataContext="{Binding Source={StaticResource filelist_provider}}"         
ItemsSource="{Binding}" CanUserAddRows="False" AutoGenerateColumns="False" Grid.Row="1"> 
<Style TargetType="{x:Type dg:DataGridRow}">    <Style.Triggers>        
        <DataTrigger Binding="{Binding Path=[filedate]}" Value=">TODAY">            
            <Setter Property="Background" Value="Green" />      
        </DataTrigger>  
    </Style.Triggers> 
</Style>

Answer 1

我认为你最好使用价值转换器.

像这样的东西:

[ValueConversion(typeof(DateTime), typeof(Brush))]
public class DateTimeToBrushConverter : IValueConverter
{
  public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
  {
    var dateTime = (DateTime)value;
    if (dateTime.Date < DateTime.Now)
      return Brushes.Red;
    if (dateTime.Date > DateTime.Now)
      return Brushes.Green;

    return Brushes.Black;
  }

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

您可以将颜色移动为参数,以使其更具通用性.

然后像这样申请:

<Style TargetType="{x:Type dg:DataGridRow}">
  <Setter Property="Background" 
          Value="{Binding Path=fileDate, 
            Converter={StaticResource dateTimeToBrushConverter}}" />
</Style>

在您的资源中创建dateTimeToBrushConverter的位置.