不同版本的不同类型库

Question

in my c# project I'm using a type library of an third party software to communicate that software. But when someone uses an older Version of the third party software then I have to load another type library (an older one) how can I handle this?

And the next thing is, that in the type library may be some changes so my actual code doesnt work (maybe!!)

Answer 1

First of all, you should create an Interface, which wraps the functionality of your thirdparty library. If you do so, you can have 2 implementations of that interface. One for each Version of the third party library.

public interface IWrapThirdParty {
  void ThirdPartyMethodOne(); 
  int ThirdPartyMethodTwo();
}

 public class ThirdPartyV1Wrapper : IWrapThirdParty {
  public void ThirdPartyMethodOne() {
    ThirdPartyV1 obj = new ThirdPartyV1();
    obj.ThirdPartyMethodOne();
  }
  public int ThirdPartyMethodTwo(){
    ThirdPartyV1 obj = new ThirdPartyV1();
    return obj.ThirdPartyMethodTwo();
  }
}

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To solve your problem with loading the libraries:

You can use the Assembly.Load() method after u figured out, which Version u want to load. But be aware to NEVER load an assembly 2 times.

https://msdn.microsoft.com/en-us/library/system.reflection.assembly.load(v=vs.110).aspx

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To check if the assembly is allready loaded u can use the AppDomain.CurrentDomain.GetAssemblies() Method, which will return all assemblies that are currently loaded into the AppDomain.

https://msdn.microsoft.com/en-us/library/system.appdomain.getassemblies(v=vs.110).aspx