如何改變格式的DateTimePicker的WPF應用程序（例如日/ MMM /年）
.net wpf 日期時間datetime datetimepicker datetime-format
我想更改日期的WPF應用程序中選擇了格式
本文地址 ：CodeGo.net/38065/
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1. 我被這個問題rencetly處理。我發(fā)現(xiàn)執(zhí)行此自定義格式的簡單方法，我希望這幫助你。你需要做的優(yōu)先件事情就是申請一個特定的樣式到當前的DatePicker就這樣，在您的XAML：
<DatePicker.Resources>
<Style TargetType="{x:Type DatePickerTextBox}">
<Setter Property="Control.Template">
<Setter.Value>
<ControlTemplate>
<TextBox x:Name="PART_TextBox" Width="113" HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch" Text="{Binding Path=SelectedDate,Converter={StaticResource DateTimeFormatter},RelativeSource={RelativeSource AncestorType={x:Type DatePicker}},ConverterParameter=dd-MMM-yyyy}" BorderBrush="{DynamicResource BaseBorderBrush}" />
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</DatePicker.Resources>
正如你可以在這部分看到，存在一個叫于作出具有constraints力的“PART_TextBox”的Text屬性轉換。該轉換器接收，包括您的自定義格式。最后，我們添加的代碼在C＃中的轉換器。
public class DateTimeConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
DateTime? selectedDate = value as DateTime?;
if (selectedDate != null)
{
string dateTimeFormat = parameter as string;
return selectedDate.Value.ToString(dateTimeFormat);
}
return "Select Date";
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
try
{
var valor = value as string;
if (!string.IsNullOrEmpty(valor))
{
var retorno = DateTime.Parse(valor);
return retorno;
}
return null;
}
catch
{
return DependencyProperty.UnsetValue;
}
}
}
我希望這對您有所幫助。請知道的任何問題或建議進行改進。
2.
Thread.CurrentThread.CurrentCulture = (CultureInfo)Thread.CurrentThread.CurrentCulture.Clone();
Thread.CurrentThread.CurrentCulture.DateTimeFormat.ShortDatePattern = "dd-MMM-yyyy";
3.
在XAML中：
<toolkit:DatePicker SelectedDateFormat="Long" />
或
<toolkit:DatePicker SelectedDateFormat="Short" />
4.
感謝@費爾南多?加西亞本作的基礎。
我自己編寫的DatePicker的一個DateFormat的附加屬性，讓你提供一個格式字符串的顯示和輸入。
對于輸入它會嘗試所提供的格式 CodeGo.net，回跌至試圖與當前區(qū)域性的格式解析它。
有問題的格式：
<DatePicker my:DatePickerDateFormat.DateFormat="dd/MMM/yyyy"/>
DATEFORMAT的附加屬性是：
public class DatePickerDateFormat
{
public static readonly DependencyProperty DateFormatProperty =
DependencyProperty.RegisterAttached("DateFormat", typeof (string), typeof (DatePickerDateFormat),
new PropertyMetadata(OnDateFormatChanged));
public static string GetDateFormat(DependencyObject dobj)
{
return (string) dobj.GetValue(DateFormatProperty);
}
public static void SetDateFormat(DependencyObject dobj, string value)
{
dobj.SetValue(DateFormatProperty, value);
}
private static void OnDateFormatChanged(DependencyObject dobj, DependencyPropertyChangedEventArgs e)
{
var datePicker = (DatePicker) dobj;
Application.Current.Dispatcher.BeginInvoke(
DispatcherPriority.Loaded, new Action<DatePicker>(ApplyDateFormat), datePicker);
}
private static void ApplyDateFormat(DatePicker datePicker)
{
var binding = new Binding("SelectedDate")
{
RelativeSource = new RelativeSource {AncestorType = typeof (DatePicker)},
Converter = new DatePickerDateTimeConverter(),
ConverterParameter = new Tuple<DatePicker, string>(datePicker, GetDateFormat(datePicker))
};
var textBox = GetTemplateTextBox(datePicker);
textBox.SetBinding(TextBox.TextProperty, binding);
textBox.PreviewKeyDown -= TextBoxOnPreviewKeyDown;
textBox.PreviewKeyDown += TextBoxOnPreviewKeyDown;
datePicker.CalendarOpened -= DatePickerOnCalendarOpened;
datePicker.CalendarOpened += DatePickerOnCalendarOpened;
}
private static TextBox GetTemplateTextBox(Control control)
{
control.ApplyTemplate();
return (TextBox) control.Template.FindName("PART_TextBox", control);
}
private static void TextBoxOnPreviewKeyDown(object sender, KeyEventArgs e)
{
if (e.Key != Key.Return)
return;
/* DatePicker subscribes to its TextBox's KeyDown event to set its SelectedDate if Key.Return was
* pressed. When this happens its text will be the result of its internal date parsing until it
* loses focus or another date is selected. A workaround is to stop the KeyDown event bubbling up
* and handling setting the DatePicker.SelectedDate. */
e.Handled = true;
var textBox = (TextBox) sender;
var datePicker = (DatePicker) textBox.TemplatedParent;
var dateStr = textBox.Text;
var formatStr = GetDateFormat(datePicker);
datePicker.SelectedDate = DatePickerDateTimeConverter.StringToDateTime(datePicker, formatStr, dateStr);
}
private static void DatePickerOnCalendarOpened(object sender, RoutedEventArgs e)
{
/* When DatePicker's TextBox is not focused and its Calendar is opened by clicking its calendar button
* its text will be the result of its internal date parsing until its TextBox is focused and another
* date is selected. A workaround is to set this string when it is opened. */
var datePicker = (DatePicker) sender;
var textBox = GetTemplateTextBox(datePicker);
var formatStr = GetDateFormat(datePicker);
textBox.Text = DatePickerDateTimeConverter.DateTimeToString(formatStr, datePicker.SelectedDate);
}
private class DatePickerDateTimeConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
var formatStr = ((Tuple<DatePicker, string>) parameter).Item2;
var selectedDate = (DateTime?) value;
return DateTimeToString(formatStr, selectedDate);
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
var tupleParam = ((Tuple<DatePicker, string>) parameter);
var dateStr = (string) value;
return StringToDateTime(tupleParam.Item1, tupleParam.Item2, dateStr);
}
public static string DateTimeToString(string formatStr, DateTime? selectedDate)
{
return selectedDate.HasValue ? selectedDate.Value.ToString(formatStr) : null;
}
public static DateTime? StringToDateTime(DatePicker datePicker, string formatStr, string dateStr)
{
DateTime date;
var canParse = DateTime.TryParseExact(dateStr, formatStr, CultureInfo.CurrentCulture,
DateTimeStyles.None, out date);
if (!canParse)
canParse = DateTime.TryParse(dateStr, CultureInfo.CurrentCulture, DateTimeStyles.None, out date);
return canParse ? date : datePicker.SelectedDate;
}
}
}
5.
DatePicker1.SelectedDate = DatePicker1.SelectedDate.Value.ToString("dd/MM/yyyy")
6.
通常情況下，日期格式存儲在資源文件中，這將有助于在應用程序的國際化。
你可以拿起格式從資源文件ToString(DATE_FORMAT)你的情況可能要
dateTimePicker.SelectedDate.ToString("dd-MMM-yyyy");
7.
由于改用變化DatePicker格式（如Thread.CurrentCulture）是不是一個好主意。
當然，你可以創(chuàng)建Control源自DatePicker喜歡和依賴屬性Format，但是這花費太多精力。
簡單而優(yōu)雅的解決方案，我覺得是有constraints力的值不SelectedDate本身，而是財產(chǎn)（ToolTip屬性為這個），并更新此屬性時SelectedDate被改變。
C＃進行單向綁定看起來像這樣：
DatePicker datePicker = new DatePicker();
datePicker.SetBinding(ToolTipProperty, "Date");
datePicker.SelectedDateChanged += (s, ea) =>
{
DateTime? date = datePicker.SelectedDate;
string value = date != null ? date.Value.ToString("yyyy-MM-dd") : null;
datePicker.ToolTip = value;
};
XAML +C?？雌饋響撓襁@樣：
XAML：
<DatePicker ToolTip="{Binding Date Mode=TwoWay}"
SelectedDateChanged="DatePicker_SelectedDateChanged"/>
C＃中：
private void DatePicker_SelectedDateChanged(object sender, EventArgs ea)
{
DatePicker datePicker = (DatePicker)sender;
DateTime? date = datePicker.SelectedDate;
string value = date != null ? date.Value.ToString("yyyy-MM-dd") : null;
datePicker.ToolTip = value;
}
對于雙向手柄ToolTipChanged事件來更新方式SelectedDate。
本文標題 ：如何改變格式的DateTimePicker的WPF應用程序（例如日/ MMM /年）
本文地址 ：CodeGo.net/38065/
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