注册表测试注册表键值 - C# Visual Studio 2019

Question

I've been trying to test the value of a registry key, with no success. I tried a lot of suggestions but to no success. What am I missing?

Problem : this code always returns false for value = 0 AND value = 1 (while the actual value in registry is 0 - as seen in the screenshot below).

using Microsoft.Win32;

string rpath = @"HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Policies\\System\\";
string rkey = "EnableLUA";
object value = "0";
            
if ((Registry.GetValue(rpath, rkey, value) == value))
{
    Console.WriteLine("true");
}
else 
{
    Console.WriteLine("false"); 
}

// public static object? GetValue (string keyName, string? valueName, object? defaultValue);
// https://docs.microsoft.com/en-us/dotnet/api/microsoft.win32.registry.getvalue?view=net-5.0

I'm using C# in Visual Studio 2019 and .NET 5.0

Regedit

Answer 1

Use .ToString() method to compare those values.

if (Registry.GetValue(rpath, rkey, value).ToString() == value.ToString())
{
    Console.WriteLine("true");
}
else 
{
    Console.WriteLine("false"); 
}

You can use (int) — Cast operator too. (You have to change object value = 0; if you're using this..)

UPDATE:

try
{
    RegistryKey rKey = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System");
    object rValue = rKey.GetValue("EnableLUA");
    if (rValue == null)
    {
        Console.WriteLine("No such value!");
    }
    else if (rValue.ToString() == "0")
    {
        Console.WriteLine("true");
    }
    else if (rValue.ToString() == "1")
    {
        Console.WriteLine("false"); 
    }
}
catch (NullReferenceException)
{
    Console.WriteLine("No such subkey!");
}