TimePicker的SelectedTime在绑定时报错

[hdzs]

Describe the bug

使用Stylet框架，在xaml上绑定SelectedTime到属性上时，报错“Object reference not set to an instance of anobject.”。在项目启动后热重载编辑绑定信息时可用。

Steps to reproduce the bug

无

Expected behavior

No response

Screenshots

NuGet package version

HandyControl 3.4.0

IDE

Visual Studio 2022

Framework type

.Net 5.0

Windows version

No response

Additional context

No response

[MiyamuraMiyako]

@NaBian 您好，我这边升级到3.4后也同样遇到这个问题，非Binding也不行：

[AscendantWare]

hi,

the Error is still happening.
Here is the Stacktrace:

by HandyControl.Controls.TimePicker.CoerceSelectedTime(DependencyObject d, Object value)
by System.Windows.DependencyObject.ProcessCoerceValue(DependencyProperty dp, PropertyMetadata metadata, EntryIndex& entryIndex, Int32& targetIndex, EffectiveValueEntry& newEntry, EffectiveValueEntry& oldEntry, Object& oldValue, Object baseValue, Object controlValue, CoerceValueCallback coerceValueCallback, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, Boolean skipBaseValueChecks)
by System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
by System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType, Boolean isInternal)
by System.Windows.DependencyObject.SetCurrentValue(DependencyProperty dp, Object value)
by HandyControl.Controls.TimePicker.SetSelectedTime()
by HandyControl.Controls.TimePicker.OnTextChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
by System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
by System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
by System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
by System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
by System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType, Boolean isInternal)
by System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value)
by System.Windows.Baml2006.WpfMemberInvoker.SetValue(Object instance, Object value)
by MS.Internal.Xaml.Runtime.ClrObjectRuntime.SetValue(XamlMember member, Object obj, Object value)
by MS.Internal.Xaml.Runtime.ClrObjectRuntime.SetValue(Object inst, XamlMember property, Object value)
by MS.Internal.Xaml.Runtime.PartialTrustTolerantRuntime.SetValue(Object obj, XamlMember property, Object value)
by System.Xaml.XamlObjectWriter.SetValue(Object inst, XamlMember property, Object value)
by System.Xaml.XamlObjectWriter.Logic_ApplyPropertyValue(ObjectWriterContext ctx, XamlMember prop, Object value, Boolean onParent)
by System.Xaml.XamlObjectWriter.Logic_DoAssignmentToParentProperty(ObjectWriterContext ctx)
by System.Xaml.XamlObjectWriter.Logic_AssignProvidedValue(ObjectWriterContext ctx)
by System.Xaml.XamlObjectWriter.WriteEndObject()
by System.Xaml.XamlWriter.WriteNode(XamlReader reader)
by System.Windows.Markup.WpfXamlLoader.TransformNodes(XamlReader xamlReader, XamlObjectWriter xamlWriter, Boolean onlyLoadOneNode, Boolean skipJournaledProperties, Boolean shouldPassLineNumberInfo, IXamlLineInfo xamlLineInfo, IXamlLineInfoConsumer xamlLineInfoConsumer, XamlContextStack`1 stack, IStyleConnector styleConnector)
by System.Windows.Markup.WpfXamlLoader.Load(XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri)
by System.Windows.Markup.WpfXamlLoader.LoadBaml(XamlReader xamlReader, Boolean skipJournaledProperties, Object rootObject, XamlAccessLevel accessLevel, Uri baseUri)
by System.Windows.Markup.XamlReader.LoadBaml(Stream stream, ParserContext parserContext, Object parent, Boolean closeStream)
by System.Windows.Application.LoadComponent(Object component, Uri resourceLocator)
by AscendantScheduler.MVVM.Views.JobDetailView.InitializeComponent() in F:\Projekte\SVN\Entwicklungen\Sonstiges\AscendantScheduler\trunk\AscendantScheduler\AscendantScheduler\MVVM\Views\JobDetailView.xaml: Zeile1
by AscendantScheduler.MVVM.Views.JobDetailView..ctor() in F:\Projekte\SVN\Entwicklungen\Sonstiges\AscendantScheduler\trunk\AscendantScheduler\AscendantScheduler\MVVM\Views\JobDetailView.xaml.cs: Zeile25
by System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean wrapExceptions)

[asine]

same error too

[apris-zhangpp]

I found the problem in the following code,
private static object CoerceSelectedTime(DependencyObject d, object value)
{
var dp = (TimePicker) d;
dp.Clock.SelectedTime = (DateTime?) value;
return dp.Clock.SelectedTime;
}
When we bind to select time in xaml, the Clock is null.

I found a solution If we execute this method EnsureClock(); in the constructor, we can solve this problem