在你的项目中包含以下代码:

    [DllImport("kernel32.dll", SetLastError = true, CallingConvention = CallingConvention.Winapi)]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool IsWow64Process([In] IntPtr hProcess, [Out] out bool wow64Process);

    public static int GetBit()
    {
        int MethodResult = "";
        try
        {
            int Architecture = 32;

            if ((Environment.OSVersion.Version.Major == 5 && Environment.OSVersion.Version.Minor >= 1) || Environment.OSVersion.Version.Major >= 6)
            {
                using (Process p = Process.GetCurrentProcess())
                {
                    bool Is64Bit;

                    if (IsWow64Process(p.Handle, out Is64Bit))
                    {
                        if (Is64Bit)
                        {
                            Architecture = 64;

                        }

                    }

                }

            }

            MethodResult = Architecture;

        }
        catch //(Exception ex)
        {
            //ex.HandleException();
        }
        return MethodResult;
    }

像这样使用它:

string Architecture = "This is a " + GetBit() + "bit machine";

OSInfo。位

using System;
namespace CSharp411
{
    class Program
    {
        static void Main( string[] args )
        {
           Console.WriteLine( "Operation System Information" );
           Console.WriteLine( "----------------------------" );
           Console.WriteLine( "Name = {0}", OSInfo.Name );
           Console.WriteLine( "Edition = {0}", OSInfo.Edition );
           Console.WriteLine( "Service Pack = {0}", OSInfo.ServicePack );
           Console.WriteLine( "Version = {0}", OSInfo.VersionString );
           Console.WriteLine( "Bits = {0}", OSInfo.Bits );
           Console.ReadLine();
        }
    }
}

一切都很好，但这也应该在env中工作:

PROCESSOR_ARCHITECTURE=x86

..

PROCESSOR_ARCHITECTURE=AMD64

可能太简单了;-)

还可以检查PROCESSOR_ARCHITECTURE环境变量。

它要么不存在，要么在32位Windows上被设置为“x86”。

private int GetOSArchitecture()
{
    string pa = 
        Environment.GetEnvironmentVariable("PROCESSOR_ARCHITECTURE");
    return ((String.IsNullOrEmpty(pa) || 
             String.Compare(pa, 0, "x86", 0, 3, true) == 0) ? 32 : 64);
}

完整的答案是这样的(摘自stefan-mg, ripper234和BobbyShaftoe的答案):

    [DllImport("kernel32.dll", SetLastError = true, CallingConvention = CallingConvention.Winapi)]
    [return: MarshalAs(UnmanagedType.Bool)]
    public static extern bool IsWow64Process([In] IntPtr hProcess, [Out] out bool lpSystemInfo);

    private bool Is64Bit()
    {
        if (IntPtr.Size == 8 || (IntPtr.Size == 4 && Is32BitProcessOn64BitProcessor()))
        {
            return true;
        }
        else
        {
            return false;
        }
    }

    private bool Is32BitProcessOn64BitProcessor()
    {
        bool retVal;

        IsWow64Process(Process.GetCurrentProcess().Handle, out retVal);

        return retVal;
    } 

首先检查您是否处于64位进程中。如果不是，检查32位进程是否是Wow64Process。

下面是c#中使用DllImport的直接方法。

[DllImport("kernel32.dll", SetLastError = true, CallingConvention = CallingConvention.Winapi)] 
[return: MarshalAs(UnmanagedType.Bool)] 
public static extern bool IsWow64Process([In] IntPtr hProcess, [Out] out bool lpSystemInfo); 

public static bool Is64Bit() 
{ 
    bool retVal; 

    IsWow64Process(Process.GetCurrentProcess().Handle, out retVal); 

    return retVal; 
}