我有兩個控件WPF DatePicker和WPF擴展工具包DateTimeUpDown。 DatePicker具有雙向綁定到ViewModel中的DateTime屬性,DateTimeUpDown通過元素綁定到DatePicker。控制綁定到其他控件通過ElementName,但初始值不顯示
該綁定工作正常滾動DateTimeUpDown,這將更改DatePicker控件。但是,如果設置ViewModel中的屬性的初始值,則不會設置DateTimeUpDown值。
這或多或少是它的外觀: 在Resources.xaml
<StackPanel Name="StartDate" Visibility="Collapsed">
<TextBlock Text="Start Date" Margin="0, 0, 0, 2" />
<DatePicker Name="StartDatePicker" SelectedDate="{Binding FromDateTime, Mode=TwoWay, ValidatesOnDataErrors=True}" IsTodayHighlighted="False" Uid="ReportingStartDay" />
</StackPanel>
<StackPanel Name="StartTime" Visibility="Collapsed">
<TextBlock Text="Start Time" Margin="0, 0, 10, 2" />
<xctk:DateTimeUpDown Value="{Binding ElementName=StartDatePicker, Path=SelectedDate, Mode=TwoWay}" Background="White" Format="ShortTime" Height="26" Margin="0,1,5,0" TextAlignment="Left"></xctk:DateTimeUpDown>
</StackPanel>
在視圖模型
private DateTime fromDateTime;
public DateTime FromDateTime {
get { return fromDateTime; }
set {
fromDateTime = value;
OnPropertyChanged("FromDateTime");
}
}
當FromDateTime設置的DatePicker的設置正確,但是DateTimeUpDown值沒有設置。
我現在已經嘗試添加跟蹤結合,不幸的是沒有幫助我很多:
System.Windows.Data Warning: 56 : Created BindingExpression (hash=36462666) for Binding (hash=21177529)
System.Windows.Data Warning: 58 : Path: 'SelectedDate'
System.Windows.Data Warning: 62 : BindingExpression (hash=36462666): Attach to Xceed.Wpf.Toolkit.DateTimeUpDown.Value (hash=6941388)
System.Windows.Data Warning: 67 : BindingExpression (hash=36462666): Resolving source
System.Windows.Data Warning: 70 : BindingExpression (hash=36462666): Found data context element: <null> (OK)
System.Windows.Data Warning: 74 : Lookup name EndDatePicker: queried DateTimeUpDown (hash=6941388)
System.Windows.Data Warning: 78 : BindingExpression (hash=36462666): Activate with root item DatePicker (hash=55504765)
System.Windows.Data Warning: 108 : BindingExpression (hash=36462666): At level 0 - for DatePicker.SelectedDate found accessor DependencyProperty(SelectedDate)
System.Windows.Data Warning: 104 : BindingExpression (hash=36462666): Replace item at level 0 with DatePicker (hash=55504765), using accessor DependencyProperty(SelectedDate)
System.Windows.Data Warning: 101 : BindingExpression (hash=36462666): GetValue at level 0 from DatePicker (hash=55504765) using DependencyProperty(SelectedDate): DateTime (hash=-1518077112)
System.Windows.Data Warning: 80 : BindingExpression (hash=36462666): TransferValue - got raw value DateTime (hash=-1518077112)
System.Windows.Data Warning: 89 : BindingExpression (hash=36462666): TransferValue - using final value DateTime (hash=-1518077112)
UPDATE
我發現這個問題。顯然,我的問題是由於綁定是在父類上定義屬性的專門類。當「覆蓋」繼承類中的屬性實現時,它會起作用。這沒有任何意義,但它有效。
任何理由不沿着上下結合FromDateTime財產呢? –
我試過這個,但是當UpDown環繞到另一個日期(通過午夜)時,DatePicker沒有得到更新 –
這聽起來像是另一個問題(可以/應該解決)。 –