MemoryMappedFile in Unity3D

Hello all!

I try use MemoryMAppedFile in Unity 3.4, but I have fail, because MemoryMappedFile Class present only in .Net 4.0, (System.core.dll Places there C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Core\v4.0_4.0.0.0__b77a5c561934e089\System.Core.dll), and when I insert this assembly in my project, then I have a fail:

PHP:

Internal compiler error. See the console log for more information. output was:warning CS1685: The predefined type `System.Runtime.CompilerServices.ExtensionAttribute' is ambiguous. Using definition from `System.Core, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e'
C:\\Program Files (x86)\Unity\Editor\Data\Mono\lib\mono\unity\System.Core.dll (Location of the symbol related to previous warning)
D:\test\Assets\Plugins\System.Core.dll (Location of the symbol related to previous warning)

Unhandled Exception: System.TypeLoadException: Could not load type 'System.Runtime.AssemblyTargetedPatchBandAttribute' from assembly 'System.Core'.

  at (wrapper managed-to-native) System.Reflection.Assembly:InternalGetType (System.Reflection.Module,string,bool,bool)

  at System.Reflection.Assembly.GetType (System.String name, Boolean throwOnError, Boolean ignoreCase) [0x00000] in <filename unknown>:0 

  at System.Reflection.Assembly.GetType (System.String name) [0x00000] in <filename unknown>:0 

  at Mono.CSharp.RootNamespace.GetTypeInAssembly (System.Reflection.Assembly assembly, System.String name) [0x00000] in <filename unknown>:0 

  at Mono.CSharp.RootNamespace.LookupTypeReflection (Mono.CSharp.CompilerContext ctx, System.String name, Location loc, Boolean must_be_unique) [0x00000] in <filename unknown>:0 

  at Mono.CSharp.GlobalRootNamespace.LookupTypeReflection (Mono.CSharp.CompilerContext ctx, System.String name, Location loc, Boolean must_be_unique) [0x00000] in <filename unknown>:0 

  at Mono.CSharp.Namespace.LookupType (Mono.CSharp.CompilerContext ctx, System.String name, Location loc) [0x00000] in <filename unknown>:0 

  at Mono.CSharp.Namespace.Lookup (Mono.CSharp.CompilerContext ctx, System.String name, Location loc) [0x00000] in <filename unknown>:0 

  at Mono.CSharp.TypeManager.CoreLookupType (Mono.CSharp.CompilerContext ctx, System.String ns_name, System.String name, Kind type_kind, Boolean required) [0x00000] in <filename unknown>:0 

  at Mono.CSharp.TypeManager.InitCoreTypes (Mono.CSharp.CompilerContext ctx) [0x00000] in <filename unknown>:0 

  at Mono.CSharp.Driver.Compile () [0x00000] in <filename unknown>:0 

  at Mono.CSharp.Driver.Main (System.String[] args) [0x00000] in <filename unknown>:0 

Maybe anybody knows how to solve this?

Or possible it or not?

Thanks!

 

You could be mangled up in dependencies. System.Core relies on mscorlib, which is now out of sync. So any references to new mscorlib classes will be broken.

If you have Pro you can use the Native APIs to try to get MemoryMappedFiles working.

This is actually a research task for me to do next, so if you try the Native APIs to any success lemme know and I'll mark this post and post if I make any headway.

 

Also, you need to overwrite:
C:\\Program Files (x86)\Unity\Editor\Data\Mono\lib\mono\unity\System.Core.dll
as it is linking against System.Core 2.0 AND System.Core 4.0 as it states at the top of the error with the Ambiguous comment.

 

As a bonus find:
http://stackoverflow.com/questions/2382927/can-i-use-a-net-4-0-library-in-a-net-2-0-application

It MAY work but it's going to be a lot of work and this is assuming all of MemoryMappedFile class is CLS-compliant, and it almost definitly won't work on iOS.

 

If it is .NEt 4.0 compiled it will never work. You need to ensure its a .NET 3.5 and lower compliant assembly, .NET 4 assemblies won't work as the compiled code is not compatbile with what unity supports (its not backward compatible)