c# - Is it possible to switch DLLs at runtime so as to use a different version? -


i have application contains number of plugins (mef) connect number of different i/o devices. of these plugins have number of managed , unmanaged dlls.

one manufacturer has released new firmware , new drivers. api remains same.

i thought include both dll versions in separate resource folders , copy required set output folder when application starts up.

(i guess make second copy of plugin , figure out way of loading correct 1 thought copying dlls might easier - considering plugin code unchanged)

this not work. 

static myclass() // static constructor {     // required version?     if (envvar.equals("4") )     {         path = "ver4.1.1";     }     else     {         path = "ver2.5.1";     }      // location of drivers     path = path.combine("./prj/qx", path);     string[] files = directory.getfiles(path);      // copy files , overwrite destination files if exist.     foreach (string s in files)     {         string filename = path.getfilename(s);         string destfile = path.combine(".", filename);         file.copy(s, destfile, true);     }      // force load of assemby     assembly assy = loadwithoutcache("driver.dll");     string fn = assy.fullname; }  static assembly loadwithoutcache(string path) {     using (var fs = new filestream(path, filemode.open))     {         var rawassembly = new byte[fs.length];         fs.read(rawassembly, 0, rawassembly.length);         return assembly.load(rawassembly);     } }

the error message suggests original dll loaded or should have been loaded not be.

could not load file or assembly 'driver, version=1.5.77, culture=neutral, publickeytoken=983247934' or 1 of dependencies. located assembly's manifest definition not match assembly reference. (exception hresult: 0x80131040)

is there way achieve goal or have build 2 separate versions of application?

edit should not necessary have both dlls loaded @ same time. enough start application parameter causes 1 or other dll loaded.

you in several ways. 1 possibility use managed extensibility framework (mef). monitor folder dlls reside , load new version new 1 becomes available.

the other possibility can use reflection dynamically load dll want during runtime.


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