如何从注册表设置或获取NetworkAddress项

Question

I want to read and modify the registry key value of my NetworkAddress. Its path in the registry is:

HKEY_LOCAL_MACHINE\\SYSTEM\\ControlSet001\\Control\\Class{4D36E972-E325-11CE-BFC1-08002BE10318}\\0011

Inside that path there is a key named NetworkAddress. How do I read and modify this key?

Here is what I have tried:

 RegistryKey myKey = Registry.LocalMachine.OpenSubKey(@"HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4D36E972-E325-11CE-BFC1-08002BE10318}\0011",true);
       MessageBox.Show((string) myKey.GetValue("NetworkAddress"));
       myKey.SetValue("NetworkAddress", "002408B2A2D2", RegistryValueKind.String);

I have tried this code and it is giving me this exception: How do I solve this issue? Please help me and thank you.

Answer 1

You are getting the exception because the factory method couldn't find the sub key at the specified location and returned null .

Despite your sub key address being perfectly valid, because you are using Registry.LocalMachine.OpenSubKey you are essentially specifying HKEY_LOCAL_MACHINE in the sub key address twice. The solution is to change your sub-key path to:

SYSTEM\\ControlSet001\\Control\\Class{4D36E972-E325-11CE-BFC1-08002BE10318}\\0011

You may also want to consider a more robust approach:

using (RegistryKey myKey =
    Registry.LocalMachine.OpenSubKey(
        @"SYSTEM\ControlSet001\Control\Class\{4D36E972-E325-11CE-BFC1-08002BE10318}\0011", true))
{
    if (myKey != null)
    {
        Console.WriteLine((string) myKey.GetValue("NetworkAddress"));
        myKey.SetValue("NetworkAddress", "002408B2A2D2", RegistryValueKind.String);
    }
}

Answer 2

C# is quite a rich language, so this is a lot easier to do without the registry

using System.Net.NetworkInformation;

var local = NetworkInterface.GetAllNetworkInterfaces().Where(i => i.Name == "Local Area Connection").FirstOrDefault();
var stringAddress = local.GetIPProperties().UnicastAddresses[0].Address.ToString();
var ipAddress = IPAddress.Parse(address);