C# 为什么更新注册表值的尝试失败？

我有以下代码：

RegistryKey myKey = Registry.LocalMachine.OpenSubKey("SOFTWARE\\Android Studio", true);
myKey.SetValue("StartMenuGroup", "Droidio", RegistryValueKind.String); // was "Android Studio" - change to "Droidio"

…我从中改编

但运行它会导致以下NRE转储：

*System.NullReferenceException was unhandled
  _HResult=-2147467261
  _message=Object reference not set to an instance of an object.
  HResult=-2147467261
  IsTransient=false
  Message=Object reference not set to an instance of an object.
  Source=Sandbox
  StackTrace:
       at Sandbox.Form1.button57_Click(Object sender, EventArgs e) in c:\HoldingTank\Sandbox\Form1.cs:line 2524
       at System.Windows.Forms.Control.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
       at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ButtonBase.WndProc(Message& m)
       at System.Windows.Forms.Button.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
       at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.Run(Form mainForm)
       at Sandbox.Program.Main() in c:\HoldingTank\Sandbox\Program.cs:line 19
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException:* 

我正在尝试更新的注册表设置（作为测试；然后将其设置回原位）如下所示：

当注册表项明显存在时，这怎么会失败呢

更新 我尝试了另一种方法，我采用了：

…但是，虽然它没有崩溃，但我看到了“无法打开注册表”消息

更新2 有了这个（咬口加倍）：

…我仍然得到“无法打开注册表”的结果

更新3 好的，将代码更改为此（从替代尝试中删除“HKEY_LOCAL_MACHINE”）：

…更改异常。不过，首先，正如我所看到的，“价值来自Android Studio”

…但它在下一行中断，即：

reg_64bit_AppKey.SetValue("StartMenuGroup", "Droidio");

…与：

*System.UnauthorizedAccessException was unhandled
  _HResult=-2147024891
  _message=Cannot write to the registry key.
  HResult=-2147024891
  IsTransient=false
  Message=Cannot write to the registry key.
  Source=mscorlib
  StackTrace:
       at System.ThrowHelper.ThrowUnauthorizedAccessException(ExceptionResource resource)
       at Microsoft.Win32.RegistryKey.EnsureWriteable()
       at Microsoft.Win32.RegistryKey.SetValue(String name, Object value, RegistryValueKind valueKind)
       at Microsoft.Win32.RegistryKey.SetValue(String name, Object value)
       at Sandbox.Form1.button57_Click(Object sender, EventArgs e) in c:\HoldingTank\Sandbox\Form1.cs:line 2559
       at System.Windows.Forms.Control.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
       at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ButtonBase.WndProc(Message& m)
       at System.Windows.Forms.Button.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
       at 
System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentM
anager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.Run(Form mainForm)
       at Sandbox.Program.Main() in c:\HoldingTank\Sandbox\Program.cs:line 19
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object 
state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, 
Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException:* 

那么为什么我可以阅读，但不能写作呢？我正在以管理员模式运行Visual Studio 2013，因为我正在运行此代码

更新4 这是一个未经授权的访问问题

下面是我到达设置值的行时reg_64位_AppKey的值：

F10通过它会发出“未经授权的访问”的呜呜声

更新5 创建包含此内容的文件：

REGEDIT4

[HKEY_LOCAL_MACHINE\SOFTWARE\Android Studio]

"StartMenuGroup"="Droidio"

…将其命名为“droidireg.reg”，并从Windows资源管理器中手动选择合并上下文菜单，实现了我的预期（无论如何，希望如此）：将StartMenuGroup的值更改为“Droidio”。事实上，即使只需在文件上单击两下，并在所有确认对话框中移动，也可以工作

---

所以，这是第n级的困难，但是有没有可能通过编程在该文件上调用“Merge”-IOW，将该文件放在手持设备上，然后在代码中执行它？用户是否必须浏览警告对话框，或者是否有方法通过编程防止这些对话框显示？

使用转义字符串而不是字符串文字。OpenSubKey方法似乎无法正确读取转义路径

Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Android Studio", true);

---

我在Pwninstein的一篇评论中找到了克服访问权限冲突的关键点——只需在OpenSubKey（）方法中添加一个“true”即可

我被吓坏了，但现在我可以欢呼通过tWotC（群众的智慧）组装的工作代码是：

---

就我的实际情况而言，我无疑需要使用32位版本，而不是64位版本，因为手持设备比Joe Dirth更旧，而且更难操作。

您使用的是64位操作系统吗？应用程序是以32位还是64位运行的？我认为我运行此测试的操作系统是64位的，是的；不过，最终的目标是手持设备（WindowsCE）。我不知道如何确定/指定应用程序是以32位还是64位运行。在64位操作系统上，有两个注册表视图。一个用于32位应用程序，一个用于64位应用程序。您可以使用

RegistryKey.OpenBaseKey（RegistryHive.LocalMachine，RegistryView.Registry64）

指定特定视图，该视图将始终打开64位视图，这可能就是您看到的。如果当前系统是64位的，我可能会同时检查这两个系统；登记处恨我！子键是

@“Software\Android Studio”

而不是

@“HKEY\U LOCAL\u MACHINE\Software\Android Studio”

。谢谢，但我还是得到了一个NRE。我没有说在你的字符串中使用HKEY\U LOCAL\u MACHINE\Software\Android Studio。这个…@“HKEY\U LOCAL\u MACHINE\Android Studio”应该是“Software\Android Studio”这就是我所拥有的：RegistryKey myKey=Registry.LocalMachine.OpenSubKey（@“SOFTWARE\Android Studio”，true）；SetValue（“StartMenuGroup”、“Droidio”、RegistryValueKind.String）；为“myKey”创建一个“Watch”并在行上创建断点…'设置值（“StartMenuGroup”、“Droidio”、RegistryValueKind.String）；'，并验证“myKey”实际上为空。它可能不是罪魁祸首。

*System.UnauthorizedAccessException was unhandled
  _HResult=-2147024891
  _message=Cannot write to the registry key.
  HResult=-2147024891
  IsTransient=false
  Message=Cannot write to the registry key.
  Source=mscorlib
  StackTrace:
       at System.ThrowHelper.ThrowUnauthorizedAccessException(ExceptionResource resource)
       at Microsoft.Win32.RegistryKey.EnsureWriteable()
       at Microsoft.Win32.RegistryKey.SetValue(String name, Object value, RegistryValueKind valueKind)
       at Microsoft.Win32.RegistryKey.SetValue(String name, Object value)
       at Sandbox.Form1.button57_Click(Object sender, EventArgs e) in c:\HoldingTank\Sandbox\Form1.cs:line 2559
       at System.Windows.Forms.Control.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
       at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ButtonBase.WndProc(Message& m)
       at System.Windows.Forms.Button.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
       at 
System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentM
anager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.Run(Form mainForm)
       at Sandbox.Program.Main() in c:\HoldingTank\Sandbox\Program.cs:line 19
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object 
state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, 
Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException:* 

REGEDIT4

[HKEY_LOCAL_MACHINE\SOFTWARE\Android Studio]

"StartMenuGroup"="Droidio"

Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Android Studio", true);

RegistryKey reg64key = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry64);
RegistryKey reg_64bit_AppKey = reg64key.OpenSubKey(@"SOFTWARE\Android Studio", true);
if (reg_64bit_AppKey != null)
{
    //MessageBox.Show(String.Format("value was {0}", reg_64bit_AppKey.GetValue("StartMenuGroup")));
    reg_64bit_AppKey.SetValue("StartMenuGroup", "Droidio", RegistryValueKind.String);
    //MessageBox.Show(String.Format("value is now {0}", reg_64bit_AppKey.GetValue("StartMenuGroup")));
}
else
{
    MessageBox.Show("Cannot open registry");
}