How I can know programmatically what platform the code is running under?

Question

How i can know from the code if i run under x86 OS or under x64 OS .

Thanks for help.

The correct answer depends a great deal on *why* you need to know. — Hans Passant, Jan 24 '11 at 17:54
@Hans Passant: I need from application to run 3rd party applications and I need to know what to run. — Night Walker, Jan 24 '11 at 18:40

score 11 · Accepted Answer · edited May 23 '17 at 12:18

11

You can use the following Environment properties:

System.Environment.Is64BitOperatingSystem

System.Environment.Is64BitProcess

Update

For platforms previous to .Net 4.0, the following can be used to implement the above functionality:

edited May 23 '17 at 12:18

Community

answered Jan 24 '11 at 17:39

Tim Lloyd

3

Please note that this is for .NET 4.0 or greater. – ChaosPandion Jan 24 '11 at 17:40
I know you corrected your misspelling but its nice to know I'm not the only one who goes dyslexic when trying to spell environment. :) – ChaosPandion Jan 24 '11 at 17:50
@ChaosPandion I am dyslexic. Your username is particularly hard to spell. The word 'chaos' is almost capable of sending my brain into recursive meltdown. :) – Tim Lloyd Jan 24 '11 at 17:53

score 4 · Answer 2 · answered Jan 24 '11 at 17:38

4

bool is64bit = IntPtr.Size == 8;

answered Jan 24 '11 at 17:38

ChaosPandion

1

This doesn't tell you the platform - you can still be on a 64bit OS, but running under Wow64. – Reed Copsey Jan 24 '11 at 17:41
1

@Reed - Indeed, but I don't believe they care what the platform is. OP, correct me if I'm wrong. – ChaosPandion Jan 24 '11 at 17:44
@Reed - His question is how to determine if the application is running on a 64-bit operating system or 32-bit operating system ( x86 ). The problem with your suggestion is that boolean would return true if the application was built as a x86 application specifically. – Security Hound Jan 24 '11 at 17:52
@Ramhound - Are you sure about that? Unfortunately, I can't test this right now but I was under the impression that even x86 emulation using 8-byte pointers. – ChaosPandion Jan 24 '11 at 17:58
I have tested this and @Ramhound is correct. If you build with x86, pointers are 4 bytes wide on an x64 OS. – Tim Lloyd Jan 24 '11 at 18:06

2 Answers2