Question

我从这次访问Windows注册表的尝试中得到了一个null：

using (RegistryKey registry = Registry.LocalMachine.OpenSubKey(keyPath))

keyPath是SOFTWARE\\TestKey

密钥在注册表中，为什么它不能在Local Machine配置单元中找到它？

Answer 1

如果您使用的是64位计算机，则可能会发生这种情况。首先创建一个帮助器类（需要.NET 4.0或更高版本）：

public class RegistryHelpers
{

    public static RegistryKey GetRegistryKey()
    {
        return GetRegistryKey(null);
    }

    public static RegistryKey GetRegistryKey(string keyPath)
    {
        RegistryKey localMachineRegistry
            = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine,
                                      Environment.Is64BitOperatingSystem
                                          ? RegistryView.Registry64
                                          : RegistryView.Registry32);

        return string.IsNullOrEmpty(keyPath)
            ? localMachineRegistry
            : localMachineRegistry.OpenSubKey(keyPath);
    }

    public static object GetRegistryValue(string keyPath, string keyName)
    {
        RegistryKey registry = GetRegistryKey(keyPath);
        return registry.GetValue(keyName);
    }
}

用法：

string keyPath = @"SOFTWARE\MyApp\Settings";
string keyName = "MyAppConnectionStringKey";

object connectionString = RegistryHelpers.GetRegistryValue(keyPath, keyName);

Console.WriteLine(connectionString);
Console.ReadLine();

Answer 2

在您对Dana的评论中，您说您已授予ASP.NET帐户访问权限。但是，您确认这是该网站运行的帐户吗？ Impersonate和匿名访问用户很容易被忽视。

未经审查的代码：

Response.Clear();  
Response.Write(Environment.UserDomainName + "\\" + Environment.UserName);  
Response.End();

Answer 3

只需将其从

进行更改

using (RegistryKey registry = Registry.LocalMachine.OpenSubKey(keyPath))

到

using (RegistryKey registry = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Default).OpenSubKey(keyPath))

（使用RegistryKey代替Registry，添加RegistryView，然后将hive-Local Machine用作方法参数。）

Registry.LocalMachine.OpenSubKey（）返回null

3 个答案: