WPF组合框IsDropDownOpen属性绑定与只写属性OneWayToSource模式

在一个简单的WPF MVVM应用程序，我得到了如下的观点：WPF组合框IsDropDownOpen属性绑定与只写属性OneWayToSource模式

<Grid DataContext="{StaticResource PageViewModel}"> 
    <StackPanel> 
     <ComboBox Width="100" Margin="10" 
       IsDropDownOpen="{Binding ComboOpen, Mode=OneWayToSource}" 
       IsEditable="True"> 
      <ComboBoxItem>1</ComboBoxItem> 
      <ComboBoxItem>2</ComboBoxItem> 
      <ComboBoxItem>3</ComboBoxItem> 
      <ComboBoxItem>4</ComboBoxItem> 
      <ComboBoxItem>5</ComboBoxItem> 
     </ComboBox> 
    </StackPanel> 
</Grid>

和视图模型类似于：

public bool ComboOpen 
{ 
    set 
    { 
     System.Diagnostics.Debug.Print(" Combobox is " + (value?" dropped down":" closed"));   
    } 
}

我得到正确的在构建应用程序的Windows 7上的行为。只要我运行该应用程序，我可以看到组合框是可以放下的，用户可以放下组合框并选择值。我也能够输入Combobox来选择一个值。

之后，我把应用程序运行在Windows Xp SP3上并且运行。我无法再放下组合框。我能够输入值，然后选择正确的项目。

任何人都可以请告知为什么组合框没有在Windows XP Sp3中下降？

在此先感谢...

[更新：13/10/2014]只是为了提供更多的信息：我试图重现该问题在家用机和我的Windows 7上的惊喜，以及，我无法降低下拉框。我复制从我的工作机的调试日志它完美的作品，并从家用机：

调试日志从家用机的地方被打破：

'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_32\mscorlib\v4.0_4.0.0.0__b77a5c561934e089\mscorlib.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\assembly\GAC_MSIL\Microsoft.VisualStudio.HostingProcess.Utilities\10.0.0.0__b03f5f7f11d50a3a\Microsoft.VisualStudio.HostingProcess.Utilities.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Windows.Forms\v4.0_4.0.0.0__b77a5c561934e089\System.Windows.Forms.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Drawing\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Drawing.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System\v4.0_4.0.0.0__b77a5c561934e089\System.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\assembly\GAC_MSIL\Microsoft.VisualStudio.HostingProcess.Utilities.Sync\10.0.0.0__b03f5f7f11d50a3a\Microsoft.VisualStudio.HostingProcess.Utilities.Sync.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\assembly\GAC_MSIL\Microsoft.VisualStudio.Debugger.Runtime\10.0.0.0__b03f5f7f11d50a3a\Microsoft.VisualStudio.Debugger.Runtime.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Users\XXXXXX\Desktop\X\DropdownIssue\bin\Debug\DropdownIssue.vshost.exe', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_32\System.Data\v4.0_4.0.0.0__b77a5c561934e089\System.Data.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Core\v4.0_4.0.0.0__b77a5c561934e089\System.Core.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Xml\v4.0_4.0.0.0__b77a5c561934e089\System.Xml.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\Microsoft.CSharp\v4.0_4.0.0.0__b03f5f7f11d50a3a\Microsoft.CSharp.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Xml.Linq\v4.0_4.0.0.0__b77a5c561934e089\System.Xml.Linq.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Data.DataSetExtensions\v4.0_4.0.0.0__b77a5c561934e089\System.Data.DataSetExtensions.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Xaml\v4.0_4.0.0.0__b77a5c561934e089\System.Xaml.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\WindowsBase\v4.0_4.0.0.0__31bf3856ad364e35\WindowsBase.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_32\PresentationCore\v4.0_4.0.0.0__31bf3856ad364e35\PresentationCore.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\PresentationFramework\v4.0_4.0.0.0__31bf3856ad364e35\PresentationFramework.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
The thread 'vshost.NotifyLoad' (0x2150) has exited with code 0 (0x0). 
The thread '<No Name>' (0x2088) has exited with code 0 (0x0). 
The thread '<No Name>' (0x20f4) has exited with code 0 (0x0). 
The thread 'vshost.LoadReference' (0x1604) has exited with code 0 (0x0). 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Users\XXXXXXXXXX\Desktop\X\DropdownIssue\bin\Debug\DropdownIssue.exe', Symbols loaded. 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Configuration\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 
Step into: Stepping over non-user code 'DropdownIssue.App.App' 
Step into: Stepping over non-user code 'DropdownIssue.App.InitializeComponent' 
Combobox is closed 
System.Windows.Data Error: 17 : Cannot get 'ComboOpen' value (type 'Boolean') from '' (type 'PageViewModel'). BindingExpression:Path=ComboOpen; DataItem='PageViewModel' (HashCode=52085517); target element is 'ComboBox' (Name=''); target property is 'IsDropDownOpen' (type 'Boolean') ArgumentException:'System.ArgumentException: Property Get method was not found. 
    at System.Reflection.RuntimePropertyInfo.GetValue(Object obj, BindingFlags invokeAttr, Binder binder, Object[] index, CultureInfo culture) 
    at System.Reflection.RuntimePropertyInfo.GetValue(Object obj, Object[] index) 
    at MS.Internal.Data.PropertyPathWorker.GetValue(Object item, Int32 level) 
    at MS.Internal.Data.PropertyPathWorker.RawValue(Int32 k)' 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\PresentationFramework.Aero\v4.0_4.0.0.0__31bf3856ad364e35\PresentationFramework.Aero.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.

调试日志从它正常工作的机器精细。

'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_32\mscorlib\v4.0_4.0.0.0__b77a5c561934e089\mscorlib.dll' 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\assembly\GAC_MSIL\Microsoft.VisualStudio.HostingProcess.Utilities\10.0.0.0__b03f5f7f11d50a3a\Microsoft.VisualStudio.HostingProcess.Utilities.dll' 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Windows.Forms\v4.0_4.0.0.0__b77a5c561934e089\System.Windows.Forms.dll' 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Drawing\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Drawing.dll' 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System\v4.0_4.0.0.0__b77a5c561934e089\System.dll' 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\assembly\GAC_MSIL\Microsoft.VisualStudio.HostingProcess.Utilities.Sync\10.0.0.0__b03f5f7f11d50a3a\Microsoft.VisualStudio.HostingProcess.Utilities.Sync.dll' 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\assembly\GAC_MSIL\Microsoft.VisualStudio.Debugger.Runtime\10.0.0.0__b03f5f7f11d50a3a\Microsoft.VisualStudio.Debugger.Runtime.dll' 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'D:\Temp\DropdownIssue\DropdownIssue\bin\Debug\DropdownIssue.vshost.exe' 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_32\System.Data\v4.0_4.0.0.0__b77a5c561934e089\System.Data.dll' 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Core\v4.0_4.0.0.0__b77a5c561934e089\System.Core.dll' 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Xml\v4.0_4.0.0.0__b77a5c561934e089\System.Xml.dll' 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\Microsoft.CSharp\v4.0_4.0.0.0__b03f5f7f11d50a3a\Microsoft.CSharp.dll' 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Xml.Linq\v4.0_4.0.0.0__b77a5c561934e089\System.Xml.Linq.dll' 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Data.DataSetExtensions\v4.0_4.0.0.0__b77a5c561934e089\System.Data.DataSetExtensions.dll' 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Xaml\v4.0_4.0.0.0__b77a5c561934e089\System.Xaml.dll' 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\WindowsBase\v4.0_4.0.0.0__31bf3856ad364e35\WindowsBase.dll' 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_32\PresentationCore\v4.0_4.0.0.0__31bf3856ad364e35\PresentationCore.dll' 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\PresentationFramework\v4.0_4.0.0.0__31bf3856ad364e35\PresentationFramework.dll' 
The thread 'vshost.NotifyLoad' (0x4680) has exited with code 0 (0x0). 
The thread 'vshost.LoadReference' (0x3b70) has exited with code 0 (0x0). 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'D:\Temp\DropdownIssue\DropdownIssue\bin\Debug\DropdownIssue.exe', Symbols loaded. 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Configuration\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll' 
Step into: Stepping over method without symbols 'DropdownIssue.App.App' 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\PresentationFramework-SystemData\v4.0_4.0.0.0__b77a5c561934e089\PresentationFramework-SystemData.dll' 
Combobox is closed 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\PresentationFramework.Aero\v4.0_4.0.0.0__31bf3856ad364e35\PresentationFramework.Aero.dll' 
'DropdownIssue.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\UIAutomationTypes\v4.0_4.0.0.0__31bf3856ad364e35\UIAutomationTypes.dll' 
The thread '<No Name>' (0xf60) has exited with code 0 (0x0).

来源

2014-10-09 Rakshit Bakshi

我的猜测是你在XP机器上安装了不同版本的.Net Framework。你能提供关于环境的更多细节吗？ – 2014-10-12 13:21:58

必须使用MS支持才能打开票证来解决此问题。他们建议如下：

基于OneWayToSource设计，getter不是必需的。
xaml解析器在.Net 4.0中进行了重新设计，这是它的遗留问题。 .Net 4.5+已经解决了这个问题。

我已经在.NET 4.5中验证过，问题在那里解决。

来源

2015-06-29 00:20:58

WPF组合框IsDropDownOpen属性绑定与只写属性OneWayToSource模式

回答

相关问题