Question

我有这段代码：

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

...我改编自here。

运行它，但会导致以下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:*

我试图更新的注册表设置（作为测试;然后我将其重新设置）在这里：

enter image description here

当注册表项明显存在时，怎么会失败？

更新

我尝试了另一种方法，我改编自here：

RegistryKey reg32key = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, 
    RegistryView.Registry32);
RegistryKey reg_32bit_AppKey = 
    reg32key.OpenSubKey(@"HKEY_LOCAL_MACHINE\SOFTWARE\Android Studio");
if (reg_32bit_AppKey != null)
{
    MessageBox.Show(String.Format("value was {0}", 
        reg_32bit_AppKey.GetValue("StartMenuGroup").ToString()));
    reg_32bit_AppKey.SetValue("StartMenuGroup", "Droidio");
    MessageBox.Show(String.Format("value is now {0}", 
        reg_32bit_AppKey.GetValue("StartMenuGroup").ToString()));
}
else
{
    MessageBox.Show("Cannot open registry");
}

...但是，虽然它没有崩溃，但我看到＆＃34; 无法打开注册表＆＃34;消息。

更新2

这样（比特加倍）：

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

...我仍然得到＆＃34; 无法打开注册表＆＃34;结果

更新3

好的，将代码更改为此（从替代尝试中删除＆＃34; HKEY_LOCAL_MACHINE＆＃34;）

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

...更改异常。首先，正如我所看到的，有一些进展，＆＃34; 价值是Android Studio ＆＃34;

...但是它会在下一行中断，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:*

那么为什么我能读，但不能写？我在运行此代码时以管理员模式运行Visual Studio 2013 ...

更新4

现在这是一个未经授权的访问问题。

当我到达设置值的行时，这里是reg_64bit_AppKey的值：

enter image description here

F10通过它咳嗽＆＃34;未经授权的访问＆＃34; whin并[g] ING。

更新5

使用此内容创建文件：

REGEDIT4

[HKEY_LOCAL_MACHINE\SOFTWARE\Android Studio]

"StartMenuGroup"="Droidio"

...命名它＆＃34; DroidioReg.reg ＆＃34;，并从Windows资源管理器手动选择合并上下文菜单做了我的预期（希望，无论如何）：更改了StartMenuGroup＆＃ 39;对于＆＃34; Droidio＆＃34;的价值。实际上，即使只是双击文件并浏览所有确认对话框也可以。

所以，这对于N学位来说是愚蠢的，但是有可能以编程方式调用＆＃34; Merge＆＃34;在该文件上 - 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，或者是否有办法以编程方式阻止显示这些对话框？

Answer 1

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);

Answer 2

我在Pwninstein的评论中找到了克服访问权限违规here的关键点 - 只需附加一个＆＃34; true＆＃34;到OpenSubKey（）方法就可以了。

我很害怕，但现在我可以说通过tWotC（群众的智慧）组装的工作代码是：

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");
}

对于我的真实情况，我无疑需要使用32位版本，而不是64位，因为手持设备比Joe Dirt更老，而且两次就是脾气暴躁。

为什么尝试更新注册表值失败？

更新

更新2

更新3

更新4

更新5

2 个答案: