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RegistryHive Enumeration

Represents the possible values for a top-level node on a foreign machine.

Namespace: Microsoft.Win32
Assembly: mscorlib (in mscorlib.dll)

[SerializableAttribute] 
[ComVisibleAttribute(true)] 
public enum RegistryHive
/** @attribute SerializableAttribute() */ 
/** @attribute ComVisibleAttribute(true) */ 
public enum RegistryHive
SerializableAttribute 
ComVisibleAttribute(true) 
public enum RegistryHive

 Member nameDescription
ClassesRootRepresents the HKEY_CLASSES_ROOT base key on another computer. This value can be passed to the OpenRemoteBaseKey method, to open this node remotely. 
CurrentConfigRepresents the HKEY_CURRENT_CONFIG base key on another computer. This value can be passed to the OpenRemoteBaseKey method, to open this node remotely. 
CurrentUserRepresents the HKEY_CURRENT_USER base key on another computer. This value can be passed to the OpenRemoteBaseKey method, to open this node remotely. 
DynDataRepresents the HKEY_DYN_DATA base key on another computer. This value can be passed to the OpenRemoteBaseKey method, to open this node remotely. 
LocalMachineRepresents the HKEY_LOCAL_MACHINE base key on another computer. This value can be passed to the OpenRemoteBaseKey method, to open this node remotely. 
PerformanceDataRepresents the HKEY_PERFORMANCE_DATA base key on another computer. This value can be passed to the OpenRemoteBaseKey method, to open this node remotely. 
UsersRepresents the HKEY_USERS base key on another computer. This value can be passed to the OpenRemoteBaseKey method, to open this node remotely. 

RegistryHive values are used by the OpenRemoteBaseKey method to represent the top-level node of a requested key on a foreign (remote) machine. The node that can be opened with the OpenRemoteBaseKey method must be one of these top-level RegistryKeys. Further access to the subkeys of the identified node is available using using methods in RegistryKey, so long as the the user has appropriate permission.

The following code example shows how to open a registry key on a remote computer and enumerate the values of the key. The remote computer must be running the remote registry service. Specify the name of the remote computer as a command-line argument when invoking the program.

using System;
using System.IO;
using System.Security.Permissions;
using Microsoft.Win32;

[assembly: RegistryPermissionAttribute(SecurityAction.RequestMinimum,
    Read = @"HKEY_CURRENT_USER\Environment")]
[assembly: SecurityPermissionAttribute(SecurityAction.RequestMinimum,
    UnmanagedCode = true)]

class RemoteKey
{
    static void Main(string[] args)
    {
        RegistryKey environmentKey;
        string remoteName;

        // Check that an argument was specified when the 
        // program was invoked.
        if(args.Length == 0)
        {
            Console.WriteLine("Error: The name of the remote " +
                "computer must be specified when the program is " +
                "invoked.");
            return;
        }
        else
        {
            remoteName = args[0];
        }

        try
        {
            // Open HKEY_CURRENT_USER\Environment 
            // on a remote computer.
            environmentKey = RegistryKey.OpenRemoteBaseKey(
                RegistryHive.CurrentUser, remoteName).OpenSubKey(
                "Environment");
        }
        catch(IOException e)
        {
            Console.WriteLine("{0}: {1}", 
                e.GetType().Name, e.Message);
            return;
        }

        // Print the values.
        Console.WriteLine("\nThere are {0} values for {1}.", 
            environmentKey.ValueCount.ToString(), 
            environmentKey.Name);
        foreach(string valueName in environmentKey.GetValueNames())
        {
            Console.WriteLine("{0,-20}: {1}", valueName, 
                environmentKey.GetValue(valueName).ToString());
        }

        // Close the registry key.
        environmentKey.Close();
    }
}

import System.*;
import System.IO.*;
import System.Security.Permissions.*;
import Microsoft.Win32.*;

/** @assembly RegistryPermissionAttribute(SecurityAction.RequestMinimum, 
    Read = "HKEY_CURRENT_USER\\Environment")
 */
/** @assembly SecurityPermissionAttribute(SecurityAction.RequestMinimum, 
    UnmanagedCode = true)
 */
class RemoteKey
{
    public static void main(String[] args)
    {
        RegistryKey environmentKey;
        String remoteName;
        // Check that an argument was specified when the 
        // program was invoked.
        if (args.get_Length() == 0) {
            Console.WriteLine("Error: The name of the remote " 
                + "computer must be specified when the program is " 
                + "invoked.");
            return;
        }
        else {
            remoteName = args[0];
        }

        try {
            // Open HKEY_CURRENT_USER\Environment 
            // on a remote computer.
            environmentKey = RegistryKey.OpenRemoteBaseKey(
                RegistryHive.CurrentUser, remoteName).OpenSubKey("Environment");
        }
        catch (IOException e) {
            Console.WriteLine("{0}: {1}", e.GetType().get_Name(), 
                e.get_Message());
            return;
        }

        // Print the values.
        Console.WriteLine("\nThere are {0} values for {1}.", 
            Convert.ToString(environmentKey.get_ValueCount()), 
            environmentKey.get_Name());
        for (int iCtr = 0; iCtr < environmentKey.GetValueNames().get_Length();
            iCtr++) {
            String valueName = (String)environmentKey.GetValueNames().
                get_Item(iCtr);
            Console.WriteLine("{0,-20}: {1}", valueName, 
                environmentKey.GetValue(valueName).ToString());
        }

        // Close the registry key.
        environmentKey.Close();
    } //main
} //RemoteKey

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

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