从 x64 应用程序检查 32 位和 64 位注册表中的值？

Question

我正在编写代码，需要检查是否安装了程序，如果安装了，则获取路径。路径存储在任一

HKEY_LOCAL_MACHINE\SOFTWARE\Some\Registry\Path\InstallLocation

或

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Some\Registry\Path\InstallLocation

取决于安装的是 32 位还是 64 位版本的程序。

我现在的代码在 64 位机器上运行时无法找到 32 位安装的路径：

const string topKeyPath = @"HKEY_LOCAL_MACHINE\SOFTWARE";
const string subLocationPath = @"Some\Registry\Path\InstallLocation";

object pathObj = Registry.GetValue(topKeyPath + @"\" + subLocationPath, null, null);

if (pathObj == null) // if 32-bit isn't installed, try to find 64-bit
{
    try
    {
        RegistryKey view32 = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32);
        view32 = view32.OpenSubKey("SOFTWARE");
        view32 = view32.OpenSubKey(subLocationPath);

        pathObj = view32.OpenSubKey(subLocationPath, false).GetValue(null);

        if (pathObj == null)
        {
            throw new InvalidOperationException("Not installed.");
        }
    }
    catch (Exception e)
    {
        throw new InvalidOperationException("Not installed.", e);
    }
}

string installPath = Convert.ToString(pathObj);

Answer 1

我通过将代码重构为更干净、更逻辑的方式解决了这个问题。

        string installPath = GetInstallLocation(RegistryView.Default); // try matching architecture

        if (installPath == null)
        {
            installPath = GetInstallLocation(RegistryView.Registry64); // explicitly try for 64-bit
        }

        if (installPath == null)
        {
            installPath = GetInstallLocation(RegistryView.Registry32); // explicitly try for 32-bit
        }

        if (installPath == null) // must not be installed
        {
            throw new InvalidOperationException("Program is not instlaled.");
        }

---

    public static string GetInstallLocation(RegistryView flavor)
    {

        const string subLocationPath = @"SOFTWARE\Microsoft\Some\Registry\Path\InstallLocation";
        object pathObj;

        try
        {
            RegistryKey view32 = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, flavor);
            view32 = view32.OpenSubKey(subLocationPath);

            pathObj = view32.GetValue(null);

            return pathObj != null ? Convert.ToString(pathObj) : null;
        }
        catch (Exception)
        {
            return null;
        }
    }