C＃读取注册表：产品ID返回空值在86针对性的应用程序。 "任何CPU"工作正常 [英] C# Reading the registry: ProductID returns null in x86 targeted app. "Any CPU" works fine

问题描述

我最近b我的项目设置为on 任何CPU 运行移动到W7 64位机VS 2010 $ B $。当我将其更改为在 86 有针对性，我注意到我的一些注册表的要求不再起作用。

I have recently moved to a W7 64bit machine with VS 2010. My project is set to run on Any CPU. When I change this to be targeted at x86 I noticed some of my registry calls no longer work.

我尝试读取的ProductID 字段，像这样：

I am trying to read the ProductID field like so:

RegistryKey windowsNTKey = Registry.LocalMachine.OpenSubKey(@"Software\Microsoft\Windows NT\CurrentVersion");
object productID = windowsNTKey.GetValue("ProductId");

的productID 总是空<在x86的模式下运行时，在运行时/ code>任何CPU它工作正常。这到底是怎么回事呢？

productID is always null when running in x86 mode, when running in "Any CPU" it works correctly. What is going on here?

推荐答案

某些注册表项被重定向WOW64。关于该主题的更多信息可在MSDN上
的http：// msdn.microsoft.com/en-us/library/aa384232(v=vs.85).aspx

Some registry keys are redirected by WOW64. More information on this topic is available on MSDN http://msdn.microsoft.com/en-us/library/aa384232(v=vs.85).aspx

如果你真的想始终可以访问64位节点（.NET4）：

If you really want to always access the x64 node (.Net4) :

  RegistryKey localMachine = RegistryKey.OpenBaseKey(Microsoft.Win32.RegistryHive.LocalMachine, RegistryView.Registry64);
  RegistryKey windowsNTKey = localMachine.OpenSubKey(@"Software\Microsoft\Windows NT\CurrentVersion");
  object productID = windowsNTKey.GetValue("ProductId");

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