来自Chriz Yuen的博客

介绍了两个新的环境属性 Environment.Is64BitOperatingSystem; Environment.Is64BitProcess;

当你使用这两种属性时请小心。 在Windows 7 64位机器上测试

//Workspace: Target Platform x86
Environment.Is64BitOperatingSystem True
Environment.Is64BitProcess False

//Workspace: Target Platform x64
Environment.Is64BitOperatingSystem True
Environment.Is64BitProcess True

//Workspace: Target Platform Any
Environment.Is64BitOperatingSystem True
Environment.Is64BitProcess True

我正在使用以下代码。注意:它是为AnyCPU项目制作的。

    public static bool Is32bitProcess(Process proc) {
        if (!IsThis64bitProcess()) return true; // We're in 32-bit mode, so all are 32-bit.

        foreach (ProcessModule module in proc.Modules) {
            try {
                string fname = Path.GetFileName(module.FileName).ToLowerInvariant();
                if (fname.Contains("wow64")) {
                    return true;
                }
            } catch {
                // What on earth is going on here?
            }
        }
        return false;
    }

    public static bool Is64bitProcess(Process proc) {
        return !Is32bitProcess(proc);
    }

    public static bool IsThis64bitProcess() {
        return (IntPtr.Size == 8);
    }

微软为此提供了一个代码示例:

http://1code.codeplex.com/SourceControl/changeset/view/39074#842775

它是这样的:

    /// <summary>
    /// The function determines whether the current operating system is a 
    /// 64-bit operating system.
    /// </summary>
    /// <returns>
    /// The function returns true if the operating system is 64-bit; 
    /// otherwise, it returns false.
    /// </returns>
    public static bool Is64BitOperatingSystem()
    {
        if (IntPtr.Size == 8)  // 64-bit programs run only on Win64
        {
            return true;
        }
        else  // 32-bit programs run on both 32-bit and 64-bit Windows
        {
            // Detect whether the current process is a 32-bit process 
            // running on a 64-bit system.
            bool flag;
            return ((DoesWin32MethodExist("kernel32.dll", "IsWow64Process") &&
                IsWow64Process(GetCurrentProcess(), out flag)) && flag);
        }
    }

    /// <summary>
    /// The function determins whether a method exists in the export 
    /// table of a certain module.
    /// </summary>
    /// <param name="moduleName">The name of the module</param>
    /// <param name="methodName">The name of the method</param>
    /// <returns>
    /// The function returns true if the method specified by methodName 
    /// exists in the export table of the module specified by moduleName.
    /// </returns>
    static bool DoesWin32MethodExist(string moduleName, string methodName)
    {
        IntPtr moduleHandle = GetModuleHandle(moduleName);
        if (moduleHandle == IntPtr.Zero)
        {
            return false;
        }
        return (GetProcAddress(moduleHandle, methodName) != IntPtr.Zero);
    }

    [DllImport("kernel32.dll")]
    static extern IntPtr GetCurrentProcess();

    [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
    static extern IntPtr GetModuleHandle(string moduleName);

    [DllImport("kernel32", CharSet = CharSet.Auto, SetLastError = true)]
    static extern IntPtr GetProcAddress(IntPtr hModule,
        [MarshalAs(UnmanagedType.LPStr)]string procName);

    [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    static extern bool IsWow64Process(IntPtr hProcess, out bool wow64Process);

还有一个可用的WMI版本(用于测试远程机器)。

如果你使用的是。net Framework 4.0，这很简单:

Environment.Is64BitOperatingSystem

看到环境。Is64BitOperatingSystem属性。

享受;-)

Function Is64Bit() As Boolean

    Return My.Computer.FileSystem.SpecialDirectories.ProgramFiles.Contains("Program Files (x86)")

End Function

最快的方式:

if(IntPtr.Size == 8) {
    // 64 bit machine
} else if(IntPtr.Size == 4)  {
    // 32 bit machine
} 

注意:这是非常直接的，只有当程序不强制作为32位进程执行时(例如，在项目设置中通过<Prefer32Bit>true</Prefer32Bit>)，才能在64位上正确工作。