How do I tell if my application is running as a 32-bit or 64-bit application?

问题:

Any CPU) is running as a 32-bit or 64-bit application?

回答1:

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

回答2:

If you're using .NET 4.0, it's a one-liner for the current process:

Environment.Is64BitProcess 

Reference: Environment.Is64BitProcess Property (MSDN)

回答3:

I found this code from Martijn Boven that does the trick:

public static bool Is64BitMode() {     return System.Runtime.InteropServices.Marshal.SizeOf(typeof(IntPtr)) == 8; } 

回答4:

This code sample from Microsoft All-In-One Code Framework can answer your question:

Detect the process running platform in C# (CSPlatformDetector)

The CSPlatformDetector code sample demonstrates the following tasks related to platform detection:

1. Detect the name of the current operating system. (e.g. "Microsoft Windows 7 Enterprise")
2. Detect the version of the current operating system. (e.g. "Microsoft Windows NT 6.1.7600.0")
3. Determine whether the current operating system is a 64-bit operating system.
4. Determine whether the current process is a 64-bit process.
5. Determine whether an arbitrary process running on the system is 64-bit.

If you just want to determine whether the currently running process is a 64-bit process, you can use the Environment.Is64BitProcess property that is new in .NET Framework 4.

And if you want to detect whether an arbitrary application running on the system is a 64-bit process, you need to determine the OS bitness, and if it is 64-bit, call IsWow64Process() with the target process handle:

static bool Is64BitProcess(IntPtr hProcess) {     bool flag = false;      if (Environment.Is64BitOperatingSystem)     {         // On 64-bit OS, if a process is not running under Wow64 mode,          // the process must be a 64-bit process.         flag = !(NativeMethods.IsWow64Process(hProcess, out flag) && flag);     }      return flag; } 

回答5:

In .Net Standard you can use System.Runtime.InteropServices.RuntimeInformation.OSArchitecture

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