C# - 如何在 Windows 64 位上获取程序文件 (x86)

Question

I'm using:

FileInfo(
    System.Environment.GetFolderPath(
        System.Environment.SpecialFolder.ProgramFiles) 
    + @"\MyInstalledApp"

In order to determine if a program is detected on a users machine (it's not ideal, but the program I'm looking for is a right old kludge of a MS-DOS application, and I couldn't think of another method).

On Windows XP and 32-bit versions of Windows Vista this works fine. However, on x64 Windows Vista the code returns the x64 Program Files folder, whereas the application is installed in Program Files x86. Is there a way to programatically return the path to Program Files x86 without hard wiring "C:\\Program Files (x86)"?

Answer 1

The function below will return the x86 Program Files directory in all of these three Windows configurations:

• 32 bit Windows
• 32 bit program running on 64 bit Windows
• 64 bit program running on 64 bit windows

static string ProgramFilesx86()
{
    if( 8 == IntPtr.Size 
        || (!String.IsNullOrEmpty(Environment.GetEnvironmentVariable("PROCESSOR_ARCHITEW6432"))))
    {
        return Environment.GetEnvironmentVariable("ProgramFiles(x86)");
    }

    return Environment.GetEnvironmentVariable("ProgramFiles");
}

Answer 2

如果您使用的是 .NET 4，则有一个特殊的文件夹枚举ProgramFilesX86 ：

Environment.GetFolderPath(Environment.SpecialFolder.ProgramFilesX86)

Answer 3

Environment.GetEnvironmentVariable("PROGRAMFILES(X86)") ?? Environment.GetFolderPath(Environment.SpecialFolder.ProgramFiles)

Answer 4

Note, however, that the ProgramFiles(x86) environment variable is only available if your application is running 64-bit.

If your application is running 32-bit, you can just use the ProgramFiles environment variable whose value will actually be "Program Files (x86)".

Answer 5

一种方法是查找“ProgramFiles(x86)”环境变量：

String x86folder = Environment.GetEnvironmentVariable("ProgramFiles(x86)");

Answer 6

我正在编写一个可以在 Windows 7 的 x86 和 x64 平台上运行的应用程序，查询以下变量只会在任何平台上提取正确的程序文件文件夹路径。

Environment.GetEnvironmentVariable("PROGRAMFILES")

Answer 7

One-liner using the new method in .NET. Will always return x86 Program Files folder.

Environment.Is64BitOperatingSystem ? Environment.GetEnvironmentVariable("ProgramFiles(x86)") : Environment.GetEnvironmentVariable("ProgramFiles"))

Answer 8

C# Code:

Environment.GetFolderPath(Environment.SpecialFolder.ProgramFilesX86)

Output:

C:\\Program Files (x86)

Note:

We need to tell the compiler to not prefer a particular build platform.

Go to Visual Studio > Project Properties > Build > Uncheck "Prefer 32 bit"

Reason:

By default for most .NET Projects is "Any CPU 32-bit preferred"

When you uncheck 32 bit assembly will:

JIT to 32-bit code on 32 bit process

JIT to 32-bit code on 64 bit process