C# 32应用程序获取64位操作系统注册表

若C#的程序都是32位的，访问注册表的时候，会访问HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\， 而访问不到HKEY_LOCAL_MACHINE\SOFTWARE
适用版本：.NET 4.0及更高版本

public static Dictionary<string, string> GetInstalledList()
{
    Dictionary<string, string> softList = new Dictionary<string, string>();
    try
    {
        // search in: CurrentUser
        RegistryKey localKey = RegistryKey.OpenBaseKey(RegistryHive.CurrentUser, RegistryView.Registry64);
        foreach (var item in GetInstallSoftList(localKey, @"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall"))
        {
            if (!softList.ContainsKey(item.Key))
            {
                softList.Add(item.Key, item.Value);
            }
        }
        localKey = RegistryKey.OpenBaseKey(RegistryHive.CurrentUser, RegistryView.Registry32);
        foreach (var item in GetInstallSoftList(localKey, @"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall"))
        {
            if (!softList.ContainsKey(item.Key))
            {
                softList.Add(item.Key, item.Value);
            }
        }

        // search in: LocalMachine_32
        localKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry64);
        foreach (var item in GetInstallSoftList(localKey, @"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall"))
        {
            if (!softList.ContainsKey(item.Key))
            {
                softList.Add(item.Key, item.Value);
            }
        }
        localKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32);
        foreach (var item in GetInstallSoftList(localKey, @"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall"))
        {
            if (!softList.ContainsKey(item.Key))
            {
                softList.Add(item.Key, item.Value);
            }
        }

        // search in: LocalMachine_64
        localKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry64);
        foreach (var item in GetInstallSoftList(localKey, @"SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall"))
        {
            if (!softList.ContainsKey(item.Key))
            {
                softList.Add(item.Key, item.Value);
            }
        }
        localKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32);
        foreach (var item in GetInstallSoftList(localKey, @"SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall"))
        {
            if (!softList.ContainsKey(item.Key))
            {
                softList.Add(item.Key, item.Value);
            }
        }
    }
    catch (Exception ex)
    {
        logger.Error(ex);
    }
    return softList;
}


private static Dictionary<string, string> GetInstallSoftList(RegistryKey localKey, string subKey)
{
    Dictionary<string, string> softList = new Dictionary<string, string>();
    RegistryKey key = localKey.OpenSubKey(subKey);
    if (key != null)
    {
        foreach (String keyName in key.GetSubKeyNames())
        {
            RegistryKey subkey = key.OpenSubKey(keyName);
            string displayName = subkey.GetValue("DisplayName") as string;
            var version = GetSoftVersion(subkey);
            if (displayName != null && !softList.ContainsKey(displayName))
            {
                softList.Add(displayName, version == null ? "" : version.ToString().Replace(",", ".").Replace(" ", ""));
            }
        }
    }

    return softList;
}


private static string GetSoftVersion(RegistryKey key)
{
    if (key == null)
    {
        return null;
    }
    var version = key.GetValue("DisplayVersion");
    if (version != null && !string.IsNullOrEmpty(version.ToString()))
    {
        return version.ToString();
    }

    var majorVersion = key.GetValue("MajorVersion");
    var minorVersion = key.GetValue("MinorVersion");
    if (majorVersion != null && minorVersion != null && !string.IsNullOrEmpty(majorVersion.ToString()) && !string.IsNullOrEmpty(minorVersion.ToString()))
    {
        return majorVersion.ToString() + "." + minorVersion;
    }

    majorVersion = key.GetValue("VersionMajor");
    minorVersion = key.GetValue("VersionMinor");
    if (majorVersion != null && minorVersion != null && !string.IsNullOrEmpty(majorVersion.ToString()) && !string.IsNullOrEmpty(minorVersion.ToString()))
    {
        return majorVersion.ToString() + "." + minorVersion;
    }

    return null;
}
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