更改WPF日期选择器的字符串格式

我用这个代码解决了这个问题。希望它也能帮助你们。

<Style TargetType="{x:Type DatePickerTextBox}">
 <Setter Property="Control.Template">
  <Setter.Value>
   <ControlTemplate>
    <TextBox x:Name="PART_TextBox"
     Text="{Binding Path=SelectedDate, StringFormat='dd MMM yyyy', 
     RelativeSource={RelativeSource AncestorType={x:Type DatePicker}}}" />
   </ControlTemplate>
  </Setter.Value>
 </Setter>
</Style>

根据Wonko的回答,似乎不能用Xaml格式或从DatePicker继承来指定日期格式。

我已将以下代码放入视图的构造函数中,该构造函数将覆盖当前线程的ShortDateFormat:

CultureInfo ci = CultureInfo.CreateSpecificCulture(CultureInfo.CurrentCulture.Name);
ci.DateTimeFormat.ShortDatePattern = "dd-MM-yyyy";
Thread.CurrentThread.CurrentCulture = ci;

DateTimePicker 现在有一个 Format FormatString 财产。如果您指定 Custom 作为格式类型,您可以提供自己的格式字符串。

<wpftk:DateTimePicker
    Value="{Binding Path=StartTime, Mode=TwoWay}"
    Format="Custom"
    FormatString="MM/dd/yyyy hh:mmtt"/>

接受的答案(谢谢@petrycol)让我走上了正确的轨道,但我在实际的日期选择器中得到了另一个文本框边框和背景色。使用以下代码修复了它。

        <Style TargetType="{x:Type Control}" x:Key="DatePickerTextBoxStyle">
            <Setter Property="BorderThickness" Value="0"/>
            <Setter Property="VerticalAlignment" Value="Center"/>
            <Setter Property="Background" Value="{x:Null}"/>
        </Style>

        <Style TargetType="{x:Type DatePickerTextBox}" >
            <Setter Property="Control.Template">
                <Setter.Value>
                    <ControlTemplate>
                        <TextBox x:Name="PART_TextBox"
                             Text="{Binding Path=SelectedDate, StringFormat='dd-MMM-yyyy', RelativeSource={RelativeSource AncestorType={x:Type DatePicker}}}" Style="{StaticResource DatePickerTextBoxStyle}" >
                        </TextBox>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

注:这个答案(最初写于2010年)适用于早期版本。有关在较新版本中使用自定义格式的信息,请参阅其他答案

如果您下载了工具箱的源代码以及二进制文件,您可以看到它是如何定义的。下面是该代码的一些亮点:

日期选择器.cs

#region SelectedDateFormat

/// <summary>
/// Gets or sets the format that is used to display the selected date.
/// </summary>
public DatePickerFormat SelectedDateFormat
{
    get { return (DatePickerFormat)GetValue(SelectedDateFormatProperty); }
    set { SetValue(SelectedDateFormatProperty, value); }
}

/// <summary>
/// Identifies the SelectedDateFormat dependency property.
/// </summary>
public static readonly DependencyProperty SelectedDateFormatProperty =
    DependencyProperty.Register(
    "SelectedDateFormat",
    typeof(DatePickerFormat),
    typeof(DatePicker),
    new FrameworkPropertyMetadata(OnSelectedDateFormatChanged),
    IsValidSelectedDateFormat);

/// <summary>
/// SelectedDateFormatProperty property changed handler.
/// </summary>
/// <param name="d">DatePicker that changed its SelectedDateFormat.</param>
/// <param name="e">DependencyPropertyChangedEventArgs.</param>
private static void OnSelectedDateFormatChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
    DatePicker dp = d as DatePicker;
    Debug.Assert(dp != null);

    if (dp._textBox != null)
    {
        // Update DatePickerTextBox.Text
        if (string.IsNullOrEmpty(dp._textBox.Text))
        {
            dp.SetWaterMarkText();
        }
        else
        {
            DateTime? date = dp.ParseText(dp._textBox.Text);

            if (date != null)
            {
                dp.SetTextInternal(dp.DateTimeToString((DateTime)date));
            }
        }
    }
}



#endregion SelectedDateFormat

private static bool IsValidSelectedDateFormat(object value)
{
    DatePickerFormat format = (DatePickerFormat)value;

    return format == DatePickerFormat.Long
        || format == DatePickerFormat.Short;
}

private string DateTimeToString(DateTime d)
{
    DateTimeFormatInfo dtfi = DateTimeHelper.GetCurrentDateFormat();

    switch (this.SelectedDateFormat)
    {
        case DatePickerFormat.Short:
            {
                return string.Format(CultureInfo.CurrentCulture, d.ToString(dtfi.ShortDatePattern, dtfi));
            }

        case DatePickerFormat.Long:
            {
                return string.Format(CultureInfo.CurrentCulture, d.ToString(dtfi.LongDatePattern, dtfi));
            }
    }      

    return null;
}

日期pickerformat.cs

public enum DatePickerFormat
{
    /// <summary>
    /// Specifies that the date should be displayed 
    /// using unabbreviated days of the week and month names.
    /// </summary>
    Long = 0,

    /// <summary>
    /// Specifies that the date should be displayed 
    ///using abbreviated days of the week and month names.
    /// </summary>
    Short = 1
}

XAML公司

 <DatePicker x:Name="datePicker" />

var date = Convert.ToDateTime(datePicker.Text).ToString("yyyy/MM/dd");

在ToString(“”)中输入所需的格式,例如ToString(“dd-MMM-yyy”),输出格式为2017年6月7日

转换器等级:

public class DateFormat : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if (value == null) return null;
        return ((DateTime)value).ToString("dd-MMM-yyyy");
    }

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

<DatePicker Grid.Column="3" SelectedDate="{Binding DateProperty, Converter={StaticResource DateFormat}}" Margin="5"/>

希望有帮助

显示的格式取决于位置,但可以通过以下方式避免:

  ValueStringFormat="{}{0:MM'-'yy}" />

正如本·皮尔斯所回答的,我们可以使用 类来处理自定义格式, 我真的认为这是唯一合乎逻辑的方法。如果您有不同格式的DateTimePicker,则可以使用:

CultureInfo ci = CultureInfo.CreateSpecificCulture(CultureInfo.CurrentCulture.Name);
ci.DateTimeFormat.LongDatePattern = "MMM.yyyy"; //This can be used for one type of DatePicker
ci.DateTimeFormat.ShortDatePattern = "dd.MMM.yyyy"; //for the second type
Thread.CurrentThread.CurrentCulture = ci;

  <DatePicker Name="dateTimePicker1" SelectedDateFormat="Long"  />