是否可以从.net 3.5项目获取程序集.net 4.0的类型？

Question

I am trying to get a type of some Microsoft .net 4.0 dll from .net 3.5 project. Don't wont to load them since I know that is impossible with Assembly.Load or LoadFrom. Only thing I need is Type. Is this possible and how to do it? For example this is dll ADONETSrc that I am trying get Type is:

Microsoft.SqlServer.ADONETSrc, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91.

Thanks,

Answer 1

Unfortunately this isn't possible. Loading a .net 4.0 type requires loading CLR engine v4.0, which can't be loaded by the .NET 2.0 CLR engine.

Answer 2

Chicked-and-egg question. Anything you could possibly do with the type requires the program to run with the v4 version of the CLR. Simple to do with a .config file, <supportedRuntime> element. At which point loading the assembly isn't a problem anymore either.

As originally stated: no, the metadata format was changed in .NET 4.0. The v2 CLR simply doesn't know how read it and will refuse to do so, throwing a BadImageFormatException. Type info is stored in the assembly metadata so you can never get to it.