Question

如果我将.cs文件中定义的ValueConverter添加到ResourceDictionary中，并将其多次用作静态资源，它会创建新实例还是仅使用相同的实例？

--------------------------------- ValueConverterDefinition ------------- ------------------

internal class DateTimeConverter : IValueConverter
{
    #region IValueConverter Members

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        var date = (DateTime)value;
        return date.Day;
    }

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

    #endregion
}

--------------------------------- ResourceDictionary中------------- ------------------

<converter:DateTimeConverter x:Key="DateTimeConverter"></converter:DateTimeToSpecificFormatConverter>
<Style x:Key="ToolTipStyle" TargetType="{x:Type ToolTip}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="ToolTip">
                <Border>
                    <Grid>                           
                        <TextBlock Foreground="Black">
                        <TextBlock.Text>
                            <Binding Path="StartDate" Converter="{StaticResource DateTimeConverter}"></Binding>
                        </TextBlock.Text>
                        </TextBlock>
                        <TextBlock Foreground="Black">
                        <TextBlock.Text>
                            <Binding Path="EndDate" Converter="{StaticResource DateTimeConverter}"></Binding>
                        </TextBlock.Text>
                        </TextBlock>
                    </Grid>
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

Answer 1

它是同一个实例，添加它在概念上等同于这样做：

var converter = new DateTimeConverter();
control.Resources.Add("Key", converter);

StaticResource然后只需通过密钥查找该实例。

但是，您可以使用x:Shared更改该行为，以便每个引用都创建一个新实例。

ResourceDictionary中的ValueConverter是Singleton？

1 个答案: