Unity and the dlls.

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Hi, first sorry for my English I don't speak very well, I'll try my best for you understand me.

So, I'm trying to use dll for connect Unity to SQL (it's not the problem), I use C#. I start my script like this :

 using UnityEngine;
 using System;
 using System.Data;
 using System.Data.SqlClient;

So Unity send me an error : "'Data' does not exist in the namespace 'System'". Here it is ok, I paste the System.Data.dll in the project folder ".../MyProject/Assets/DLLs/".

Note that I add this version of dll : 4.0.30319.18047 (one of the latest).

So, the error disappear, but now it say : "Could not load type 'System.Threading.Tasks.Task' from assembly 'mscorlib'".

I make test with Visual Studio and MonoDevelop, the result is...

System.Data.dll make a reference to "System.Threading.Tasks.Task" and say to Unity to search in the .NET 2.0 for the file. Unity found the mscorlib.dll in the folder and... the dll is outdated... effectively "Tasks.Task" doesn't exist. I watch the .NET 4.0 mscorlib.dll and in this version "Tasks.Task" exist.

So why my dll say to use an outdated version? Why Unity don't use by itself the latest version? Why I can't choose my version?

I've try to paste the good mscorlib.dll in my "./DLLs/" folder but no effect, I try to include the good dll in the Project Reference no effect or double file error depending on how I arrange the script.

After I think "Hey if you use a anterior version of System.Data.dll probably it's doesn't search for Tasks.Task". And a lot of error appear.

Am I damned?

Someone can help me?

Answer 1

Best Answer

Answer by ArkaneX · Aug 17, 2013 at 10:18 AM

The problem is you're probably adding System.Data.dll from standard .NET Framework, which requires mscorlib provided by Microsoft. You have to use Mono implementation of System.Data.dll, which you can find under:

 C:\Program Files (x86)\Unity\Editor\Data\Mono\lib\mono\unity

Out of the box this will work in Editor, but not after build. At least id didn't worked for me - I got "CodePage 1252 not supported". After a bit of googling, I found this info. Adding I18N.dll and I18N.West.dll to the project, fixed the problem.

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Silen.S.Sin · Aug 17, 2013 at 11:45 AM 0

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Thank you, it work instantly. Want to up vote but can't before 15 reputation, thank you :D.

Bunny83 · Aug 17, 2013 at 11:47 AM 1

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@silenssin: Don't post comments as answers! I've converted your answer into a comment. Next time use the "add new comment" button or your "answers" will get downvoted.

Ins$$anonymous$$d of posting a comment / answer you should accept the answer if it solved your problem.

ArkaneX · Aug 17, 2013 at 12:03 PM 0

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Agree with @Bunny83 - users have to accept good answers. This way the whole Unity community can benefit.

XcentY · Oct 08, 2014 at 10:43 PM 0

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I've been working with Visual Studio (.NET VB, .NET C++), I've benn working with Eclipse (Java). But that the first workspace where I've to copy referenced built-in libraries to make them recognized. (Also Old Built-in libraries from .NET 2.0 Framework)...

And also Copying my third party libraries to the editor path to avoid "missing namespace" issue in Unity while I don't have this problem in monodevelop.

Then sync monodevelop with Unity to avoid "invalid reference" for C-Sharp First pass scripts.

Now adding 2 languages libraries to avoid problem in the build.

Unity has to make some adjustment. It's a great tool for 3D scenes, anims, and little games. But once you come with great game, you certainly run in major issue with monodevelop and you think developing your logic in Visual Studio.

sug4rz · Feb 11, 2016 at 06:44 PM 1

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This answer don't fix the problem in Unity 5.3.2 :( Somebody has a solution?

RafaelDarde sug4rz · Jul 03, 2016 at 07:03 AM 0

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Hello! You found the solution ?

Unity and the dlls.

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