System.IO.File.Exists（@＆QUOT; C：\ WINDOWS \ SYSTEM32 \ SnippingTool.exe＆QUOT;）返回false [英] System.IO.File.Exists(@"C:\Windows\System32\SnippingTool.exe") returns false

问题描述

所以我工作的工作简单的.NET程序，并打了一下一个奇怪的障碍我想不通的。该应用程序使用它增加了应用程序下拉菜单的配置文件。然而，在它添加到菜单，它确实system.io.file.exists以验证该文件存在，至少在创建菜单的时间。

So I am working on a simple .NET program for work and hit a bit of a weird roadblock I can't figure out. The application makes use of a configuration file which adds applications to a dropdown menu. However, before it's added to the menu, it does a system.io.file.exists to verify that the file exists, at least at the time the menu is created.

不过，System.IO.File.Exists（@C：\ WINDOWS \ SYSTEM32 \ SnippingTool.exe）返回false，但可执行文件是存在的。同样，stikynot.exe也返回false。在system32目录下的其他文件返回true（如记事本）。我可以FILESTAT这些应用程序，但我的.NET程序就不能阅读它们，system.io.file.exists返回false。我已经检查各种权限，没有运气。这似乎是孤立的几个应用程序，但我不知道为什么。

However, System.IO.File.Exists(@"C:\Windows\System32\SnippingTool.exe") returns false, but the executable is there. Likewise, stikynot.exe also returns false. Other files in the system32 directory return true(like notepad). I can filestat these applications, but my .net program just can't read them them and system.io.file.exists returns false. I have checked various permissions with no luck. It seems to be isolated to a few applications, but I am not sure why.

推荐答案

这是64位Windows的功能。

That's a feature of 64 bit Windows.

在64，你有两个文件夹使用系统文件： SYSTEM32 和 Syswow64资料

In x64 you have two folders with system files: system32 and SysWOW64.

如果你把东西的 SYSTEM32 ，它会被所有的 64位应用程序可见。 Syswow64资料是有兼容性的原因 - 任何东西放在那里将是可见的 32位（！原文如此）的应用

If you put anything in system32, it will be seen by all 64 bit applications. SysWOW64 is there for compatibility reasons - anything put there will be visible by 32 bit (sic!) apps.

所以就.NET而言，该文件不存在。它适用于记事本，因为NOTEPAD.EXE是present在这两个目录中。

So as far as .NET is concerned, the file does not exist. It works for notepad, because notepad.exe is present in both of those directories.

您可以测试这种行为。创建在目录中的文本文件，而不是其他，并检查其存在。然后改变你的项目配置（右键单击解决方案 - >配置管理器）。x86和x64之间，享受结果

You can test this behaviour. Create a text file in one of the directories, but not the other and check for its existence. Then change your project configuration (right click on solution -> Configuration Manager) between x86 and x64 and enjoy the result.

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