WPF組合框IsDropDownOpen屬性綁定與只寫屬性OneWayToSource模式

在一個簡單的WPF MVVM應用程序，我得到了如下的觀點：WPF組合框IsDropDownOpen屬性綁定與只寫屬性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>

和視圖模型類似於：

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

我得到正確的在構建應用程序的Windows 7上的行爲。只要我運行該應用程序，我可以看到組合框是可以放下的，用戶可以放下組合框並選擇值。我也能夠輸入Combobox來選擇一個值。

之後，我把應用程序運行在Windows Xp SP3上並且運行。我無法再放下組合框。我能夠輸入值，然後選擇正確的項目。

任何人都可以請告知爲什麼組合框沒有在Windows XP Sp3中下降？

在此先感謝...

[更新：13/10/2014]只是爲了提供更多的信息：我試圖重現該問題在家用機和我的Windows 7上的驚喜，以及，我無法降低下拉框。我複製從我的工作機的調試日誌它完美的作品，並從家用機：

調試日誌從家用機的地方被打破：

'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.

調試日誌從它正常工作的機器精細。

'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).

來源

2014-10-09 Rakshit Bakshi

我的猜測是你在XP機器上安裝了不同版本的.Net Framework。你能提供關於環境的更多細節嗎？ – 2014-10-12 13:21:58

必須使用MS支持才能打開票證來解決此問題。他們建議如下：

基於OneWayToSource設計，getter不是必需的。
xaml解析器在.Net 4.0中進行了重新設計，這是它的遺留問題。 .Net 4.5+已經解決了這個問題。

我已經在.NET 4.5中驗證過，問題在那裏解決。

來源

2015-06-29 00:20:58

WPF組合框IsDropDownOpen屬性綁定與只寫屬性OneWayToSource模式

回答

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