问题
I'm trying to use web services on unity. I used svcutil to generate a proxy class, however the proxy class was using "System.Threading.Tasks".
I noticed that System.Threading.Tasks wasn't aviable on .Net 3.5. So I went to player setting and I changed to .Net 4.x
But now I have an other issue, and I cannot find a way to fix it, I need to use System.Web.dll and System.Web.Services.dll to make my web service work, however, the dll that are include in Program Files\Unity\Editor\Data\Mono\lib\mono\2.0 are all targets for .Net 3.5.
So that mean I cannot use them on .Net 4.x
I've been looking for quiet long and was unable to find any answer. I can add the code to the proxy class here if it's require, but I don't think it would be useful. Should I download those dll somewhere? Anyone ever seen thoses issues somewhere?
回答1:
You are using the wrong dll version.
Once you change Api Compatibility Level to Net 4.x, you have to copy the System.Web.dll and System.Web.Services.dll files from <UnityInstallationDirectory>\Editor\Data\MonoBleedingEdge\lib\mono\4.5 to your <Project>\Assets path.
That's it. Restart Visual Studio and Unity.
回答2:
There is another method of linking missing libraries as described in this unity documentation.
Create a file called csc.rsp and put these 2 lines in it:
-r:System.Web.dll
-r:System.Web.Services.dll
And yes, you better set compatibility level to .NET 4.x You also might want to restart Unity or VS in some cases.
来源：https://stackoverflow.com/questions/51084942/webservices-on-unity-dll-compatibility-with-net-4-0