我有两个控件WPF DatePicker和WPF扩展工具包DateTimeUpDown。 DatePicker具有双向绑定到ViewModel中的DateTime属性,DateTimeUpDown通过元素绑定到DatePicker。控制绑定到其他控件通过ElementName,但初始值不显示
该绑定工作正常滚动DateTimeUpDown,这将更改DatePicker控件。但是,如果设置ViewModel中的属性的初始值,则不会设置DateTimeUpDown值。
这或多或少是它的外观: 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>
在视图模型
private DateTime fromDateTime;
public DateTime FromDateTime {
get { return fromDateTime; }
set {
fromDateTime = value;
OnPropertyChanged("FromDateTime");
}
}
当FromDateTime设置的DatePicker的设置正确,但是DateTimeUpDown值没有设置。
我现在已经尝试添加跟踪结合,不幸的是没有帮助我很多:
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
我发现这个问题。显然,我的问题是由于绑定是在父类上定义属性的专门类。当“覆盖”继承类中的属性实现时,它会起作用。这没有任何意义,但它有效。
任何理由不沿着上下结合FromDateTime财产呢? –
我试过这个,但是当UpDown环绕到另一个日期(通过午夜)时,DatePicker没有得到更新 –
这听起来像是另一个问题(可以/应该解决)。 –