使用C＃代码在Windows 7中读取/写入注册表

Question

I have a windows C# application which when user runs it i want to save the current time as login time in some registry and also when he close it as logout time.When i tried, it gives me requested registry access is not allowed exception.I have tried giving permission to that registry but still getting that exception.Here is the code that i have tried

RegistrySecurity rs = new RegistrySecurity();
string currentUserStr = Environment.UserDomainName + "\\" + Environment.UserName;
rs.AddAccessRule(new RegistryAccessRule(currentUserStr, RegistryRights.WriteKey | RegistryRights.ReadKey | RegistryRights.Delete | RegistryRights.FullControl, AccessControlType.Allow));                
RegistryKey Rkey = Microsoft.Win32.Registry.LocalMachine.OpenSubKey("SYSTEM", true).OpenSubKey("Test", true);
Rkey.SetAccessControl(rs);

I also tried using app.manifest to force application run as admin every time but i want to keep that as last option. So is there any other solution to read/write registry ??

Answer 1

IMO, Your Application needs to run with elated privileges. Try running Visual Studio as Administrator.

Answer 2

I just run the code on my machine (windows 7 64 bits) as a Window Form . I did not have any problem with it (I could even remove the AddAccessRule line).

So the problem is not the code itself. Did you try to change the value in the registry manually with the same user as you run your code ? From which place (harddisk or network drive or internet..) do you run your code ? I know that running it from a network drive can give problems Let me know then maybe I can help you further

Answer 3

Access to HKLM (and that's what you're doing) requires administrative privileges

@Hitesh: you need to set MANIFESTUAC to "requireAdministrator"

In Visual Studio, this is done in: Project properties -> Linker -> Manifest File and set:

• Enable UAC to Yes,
• UAC Execution Level - requireAdministrator
• UAC Bypass UI - No

PS UAC is out there since Windows Vista...