If you are using a version of .NET older than .NET 4, you can use the following logic to check if the current environment is x64 or x86 (this method works almost the same way the .NET framework getter for the Is64BitOperatingSystem flag works; if you don’t believe me, you can use dotPeek to find out for yourself):
public static class EnvironmentHelper
{
[DllImport("kernel32.dll")]
static extern IntPtr GetCurrentProcess();
[DllImport("kernel32.dll")]
static extern IntPtr GetModuleHandle(string moduleName);
[DllImport("kernel32.dll")]
static extern IntPtr GetProcAddress(IntPtr hModule, string procName);
[DllImport("kernel32.dll")]
static extern bool IsWow64Process(IntPtr hProcess, out bool wow64Process);
public static bool Is64BitOperatingSystem()
{
// Check if this process is natively an x64 process. If it is, it will only run on x64 environments, thus, the environment must be x64.
if (IntPtr.Size == 8)
return true;
// Check if this process is an x86 process running on an x64 environment.
IntPtr moduleHandle = GetModuleHandle("kernel32");
if (moduleHandle != IntPtr.Zero)
{
IntPtr processAddress = GetProcAddress(moduleHandle, "IsWow64Process");
if (processAddress != IntPtr.Zero)
{
bool result;
if (IsWow64Process(GetCurrentProcess(), out result))
return result;
}
}
// The environment must be an x86 environment.
return false;
}
}
Example usage:
EnvironmentHelper.Is64BitOperatingSystem();
