Question

这可能是一个简单的答案，但我只是格式化数据形式字段的日期有问题。

        <df:DataForm x:Name="Form1" ItemsSource="{Binding Mode=OneWay}" AutoGenerateFields="True"
                AutoEdit="True" AutoCommit="False"
                CommitButtonContent="Save"
                CancelButtonContent="Cancel"               
                CommandButtonsVisibility="Commit"
                LabelPosition="Top" ScrollViewer.VerticalScrollBarVisibility="Disabled"
                EditEnded="NoteForm_EditEnded"> 
        <df:DataForm.EditTemplate>
            <DataTemplate>                    
                <StackPanel>
                    <df:DataField>
                        <TextBox Text="{Binding Title, Mode=TwoWay}"/>
                    </df:DataField>

                    <df:DataField>
                        <TextBox Text="{Binding Description, Mode=TwoWay}" AcceptsReturn="True" HorizontalScrollBarVisibility="Auto"
                                 VerticalScrollBarVisibility="Auto" Height="" TextWrapping="Wrap" SizeChanged="TextBox_SizeChanged"/>                        
                    </df:DataField>

                    <df:DataField>
                        <TextBlock Text="{Binding Username}"/>
                    </df:DataField>

                    <df:DataField>
                        <TextBlock Text="{Binding DateCreated}"/>
                    </df:DataField>
                </StackPanel>
            </DataTemplate>
        </df:DataForm.EditTemplate>
    </df:DataForm>

我已将此绑定到一个注释类，该注释类具有DateCreated字段的注释：

 /// <summary>
    /// Gets or sets the date created of the noteannotation
    /// </summary>
    [Display(Name="Date Created")]
    [Editable(false)]
    [DisplayFormat(DataFormatString = "{0:u}", ApplyFormatInEditMode = true)]
    public DateTime DateCreated { get; set; }

无论我设置dataformatstring，它都会返回：例如4/6/2010 10:02:15 AM

我希望格式化为yyyy-MM-dd HH：mm：ss

我已经尝试了{0：yyyy-MM-dd hh：mm：ss}之上的自定义格式，但它仍保持相同的输出。对于{0：u}或{0：s}也是如此。

Answer 1

通过在数据绑定中添加转换器来解决这个问题：

<df:DataField>
    <TextBlock Text="{Binding DateCreated, Converter={StaticResource DateConverter}}"/>
</df:DataField>

DateConverter只是一个实现IValueConverter接口的类。以下示例显示了我需要的日期时间格式..

/// <summary>
/// Date time formatter - for short dates for data bound items
/// </summary>
public class DateConverter : IValueConverter
{
    #region Public Methods

    #region IValueConvertor Members

    /// <summary>
    /// Convert data item to a short date
    /// </summary>
    /// <param name="value">Value</param>
    /// <param name="targetType">Target type</param>
    /// <param name="parameter">Paramter</param>
    /// <param name="culture">Culture</param>
    /// <returns>Converted object</returns>
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        var date = (DateTime)value;
        return (date.ToString("dd/MM/yyyy HH:mm:ss"));
    }

    /// <summary>
    /// Convert back data item to a short date
    /// </summary>
    /// <param name="value">Value</param>
    /// <param name="targetType">Target type</param>
    /// <param name="parameter">Paramter</param>
    /// <param name="culture">Culture</param>
    /// <returns>Converted object</returns>
    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        var s = (string)value;
        return (DateTime.Parse(s));
    }

    #endregion IValueConvertor Members

    #endregion Public Methods
}

这就像一种享受 - 可以通过一些空检查来改进！：）

使用Silverlight中的数据表单的数据注释进行日期格式设置

1 个答案: