silverlight 转换器

ConvtoBSfcodeToStr.cs

namespace SilverlightApplication1
{
    public class ConvtoBSfcodeToStr : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            return (value.ToString().Length < 20 ? value.ToString() : value.ToString().Substring(0,20));
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {

            return (value.ToString().Length < 20 ? value.ToString() : value.ToString().Substring(0, 20)+"...");
        }
    }  
}

xaml：

                     xmlns:localConv="clr-namespace:SilverlightApplication1"

                     <localConv:ConvtoBSfcodeToStr x:Key="ConverBStoStr"></localConv:ConvtoBSfcodeToStr>

使用时 先转换为模板列 Converter={StaticResource ConverBStoStr}

<data:DataGridTemplateColumn Header="内容" Width="1.0*">
                        <data:DataGridTemplateColumn.CellTemplate>
                            <DataTemplate>
                                <TextBlock Name="tool"  Text="{Binding ArticleContent, Mode=TwoWay, Converter={StaticResource ConverBStoStr}}">
                                <ToolTipService.ToolTip>
                                    <ToolTip MaxWidth="500">
                                         <TextBlock Text="{Binding ArticleContent}"  TextWrapping="Wrap"/>
                                    </ToolTip>
                                </ToolTipService.ToolTip>
                                </TextBlock>
                            </DataTemplate>
                        </data:DataGridTemplateColumn.CellTemplate>
                    </data:DataGridTemplateColumn>