c# - DllImport or LoadLibrary for best performance -


i have external .dll file fast assembler code inside. best way call functions in .dll file best performance?

your dll might in python or c++, whatever , same follow.

this dll file in c++.

header:

extern "c" __declspec(dllexport) int multiplybyten(int numbertomultiply);

source code file

#include "dynamicdlltocall.h"  int multiplybyten(int numbertomultiply) {     int returnvalue = numbertomultiply * 10;     return returnvalue; }

take @ following c# code:

static class nativemethods {     [dllimport("kernel32.dll")]     public static extern intptr loadlibrary(string dlltoload);      [dllimport("kernel32.dll")]     public static extern intptr getprocaddress(intptr hmodule, string procedurename);      [dllimport("kernel32.dll")]     public static extern bool freelibrary(intptr hmodule); }  class program {     [unmanagedfunctionpointer(callingconvention.cdecl)]     private delegate int multiplybyten(int numbertomultiply);      static void main(string[] args)     {             intptr pdll = nativemethods.loadlibrary(@"pathtoyourdll.dll");             //oh dear, error handling here             //if (pdll == intptr.zero)              intptr paddressoffunctiontocall = nativemethods.getprocaddress(pdll, "multiplybyten");             //oh dear, error handling here             //if(paddressoffunctiontocall == intptr.zero)              multiplybyten multiplybyten = (multiplybyten)marshal.getdelegateforfunctionpointer(                                                                                     paddressoffunctiontocall,                                                                                     typeof(multiplybyten));              int theresult = multiplybyten(10);              bool result = nativemethods.freelibrary(pdll);             //remaining code here              console.writeline(theresult);     } }

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