Where are Windows error constants defined?

Question

I am building a C# project and at some point I encounter an ErrorCode in an exception:

try {
   ...
} catch (HttpListenerException e) {
   if (e.ErrorCode == 995) {
   }
}

this works, but what I want to both make my code more readable, as well as to avoid "magic constants", is something like this (using the error code names):

try {
   ...
} catch (HttpListenerException e) {
   if (e.ErrorCode == ERROR_OPERATION_ABORTED) {
   }
}

How can I achieve that?

Are you looking for some library or function that contains the [System error codes](https://msdn.microsoft.com/en-us/library/windows/desktop/ms681381(v=vs.85).aspx)? or just this linked page? — Sayse, Aug 27 '15 at 13:52
[Related: Getting the Windows System Error Code title/description](http://stackoverflow.com/q/1650838/1324033) — Sayse, Aug 27 '15 at 13:54
@Sayse only marginally, I am looking for constants that make my code more readable, not to format a error message. — Bart Friederichs, Aug 27 '15 at 13:57
Try looking here: http://www.pinvoke.net/default.aspx/Constants.WINERROR — Icemanind, Aug 27 '15 at 13:58
Asking us to look for tools / libraries is off topic on here — deathismyfriend, Aug 27 '15 at 14:01
@BartFriederichs - I found a couple of other [links](http://stackoverflow.com/questions/3823888/how-do-i-look-up-the-proper-windows-system-error-code-to-use-in-my-application) too by searching for "c# system error codes" but none really seemed to return much useful information. I'm not sure how it can become much cleaner though than what you already have (excluding adding a comment), what are you looking to do inside the if statement? — Sayse, Aug 27 '15 at 14:02
@deathismyfriend I was hoping it is part of the C# framework, in the same way the also mentioned `winerror.h` is part of the C SDK. Apparently it isn't. I will not use a library or function to do this. If it isn't available in the framework (which would be a decent answer), I will fix it with a comment. — Bart Friederichs, Aug 27 '15 at 14:05

Icemanind · Accepted Answer · 2016-12-16T19:46:23.193

3

There is nothing built into the .NET Framework. But, you can download the complete error code class from here. It is a C# class that contains the complete list of error codes in C#. It is contained all in one file.

Add this file to your project and you should be able to do something like this:

using Microsoft.Win32.Interop;

...
...

try {
    ...
    ...
} catch (HttpListenerException e) {
    if (e.ErrorCode == WinError.ERROR_OPERATION_ABORTED) {
        // Do something
    }
}

EDIT

The above link seems to be dead now, so I am adding the link to JetBrains version. You can see it here

edited Dec 16 '16 at 19:46

answered Aug 27 '15 at 14:08

Icemanind

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The included link is dead. Do you know of anywhere that this class is mirrored? – Brian Dec 16 '16 at 16:43
@Brian - JetBrains has a pretty good version [here](http://svn.jetbrains.org/omeaopen/trunk/Omea/Src/Core/Interop.WinApi/src/Declarations/Constants/WinError.cs) – Icemanind Dec 16 '16 at 19:45

Where are Windows error constants defined?

1 Answers1