Xceed datagrid - 基於DateTime值更改datarow顏色

Question

我有一個datagrid（Xceed社區版本3.1.0）包含一般發票信息。其中一個字段包含發票的到期日期。我想爲具有到期日期的行使用不同的顏色。爲了達到這個目的，我使用了一個值轉換器。 這裏是我的XAML：

<dg:DataGridControl.Resources> 
    <Style TargetType="{x:Type dg:DataRow}" BasedOn="{StaticResource DefaultDataRowStyle}"> 
     <Setter Property="Background" Value="{Binding DocumentDueDate, Converter={StaticResource DueDateToBrushConverter}}"/> 
     <!--<Setter Property="Background" Value="OrangeRed"/>--> 
    </Style> 
</dg:DataGridControl.Resources> 

<dg:DataGridControl.Columns> 
    <dg:Column Title="{bx:LocalizeBinding Type, Global=True}" FieldName="MovementType" Width="45"/> 
    <dg:Column Title="{bx:LocalizeBinding Number, Global=True }" FieldName="DocumentNumber" Width="90"/> 
    <dg:Column Title="{bx:LocalizeBinding Date, Global=True }" FieldName="DocumentDate" Width="90"/> 
    <dg:Column Title="{bx:LocalizeBinding DueDate, Global=True }" FieldName="DocumentDueDate" Width="90"/> 
    <dg:Column Title="{bx:LocalizeBinding Debit, Global=True }" FieldName="Debit" CellHorizontalContentAlignment="Right" Width="80"> 
     <dg:Column.CellContentTemplate> 
      <DataTemplate> 
       <TextBlock Text="{Binding StringFormat=N2}" HorizontalAlignment="Right"/> 
      </DataTemplate> 
     </dg:Column.CellContentTemplate> 
    </dg:Column> 
    <dg:Column Title="{bx:LocalizeBinding Credit, Global=True }" FieldName="Credit" CellHorizontalContentAlignment="Right" Width="80"> 
     <dg:Column.CellContentTemplate> 
      <DataTemplate> 
       <TextBlock Text="{Binding StringFormat=N2}" HorizontalAlignment="Right"/> 
      </DataTemplate> 
     </dg:Column.CellContentTemplate> 
    </dg:Column> 
    <dg:Column Title="{bx:LocalizeBinding Balance, Global=True }" FieldName="Balance" CellHorizontalContentAlignment="Right"> 
     <dg:Column.CellContentTemplate> 
      <DataTemplate> 
       <TextBlock Text="{Binding StringFormat=N2}" HorizontalAlignment="Right"/> 
      </DataTemplate> 
     </dg:Column.CellContentTemplate> 
    </dg:Column> 
    <dg:Column Title="{bx:LocalizeBinding Difference, Global=True }" FieldName="Difference" CellHorizontalContentAlignment="Right"> 
     <dg:Column.CellContentTemplate> 
      <DataTemplate> 
       <TextBlock Text="{Binding StringFormat=N2}" HorizontalAlignment="Right"/> 
      </DataTemplate> 
     </dg:Column.CellContentTemplate> 
    </dg:Column> 
    <dg:Column Title="{bx:LocalizeBinding Currency, Global=True }" FieldName="Currency" Width="70"/> 
    <dg:Column Title="{bx:LocalizeBinding Description, Global=True }" FieldName="Description" Width="250" TextWrapping="Wrap"> 
    </dg:Column> 
</dg:DataGridControl.Columns> 

<dg:DataGridControl.View> 
    <dg:TableView/> 
</dg:DataGridControl.View> 

這是我的轉換器類：

public class DueDateToBrushConverter : IValueConverter 
{ 
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture) 
    { 
     DateTime? input = value as DateTime?; 
     if (input.HasValue && input < DateTime.Now) 
      return Brushes.OrangeRed; 
     else 
      return Brushes.Transparent; 
    } 

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

我把一個斷點在轉換器和代碼被執行，但該行的顏色沒有改變。將顏色設置爲固定顏色（如在註釋行中）可以很好地工作。我不知道我在做什麼錯。任何幫助將非常感激。

Answer 1

與DataTrigger，而不是嘗試：

<dg:DataGridControl.Resources> 
    <Style TargetType="{x:Type dg:DataRow}" BasedOn="{StaticResource DefaultDataRowStyle}"> 
     <Style.Triggers> 
      <DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Path=DataContext.DocumentDueDate, Converter={StaticResource ResourceKey=DueDateToBrushConverter}}" Value="true"> 
       <Setter Property="Background" Value="OrangeRed" /> 
      </DataTrigger> 
     </Style.Triggers> 
    </Style> 
</dg:DataGridControl.Resources> 

和轉換器：

public class DueDateToBrushConverter : IValueConverter 
{ 
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture) 
    { 
     DateTime? input = value as DateTime?; 
     if (input.HasValue && input < DateTime.Now) 
      return true; 
     else 
      return false; 
    } 

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