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1.н¨dll¹¤³Ì£¬ÔÚº¯ÊýÇ°ÃæÔö¼Ó extern "C" __declspec(dllexport) double __stdcall
double Ϊº¯Êý·µ»ØÖµÀàÐÍ
// log.cpp : Defines the exported functions for the DLL application.
//
#include "stdafx.h"
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <time.h>
#define PI 3.14159
double AverageRandom(double min,double max)//²úÉú(min,max)Ö®¼ä¾ùÔÈ·Ö²¼µÄËæ»úÊý
{
int MINnteger = (int)(min*10000);
int MAXnteger = (int)(max*10000);
int aa=rand();
int bb=rand();
int randInteger = aa*bb;
int diffInteger = MAXnteger - MINnteger;
int resultInteger = randInteger % diffInteger + MINnteger;
return resultInteger/10000.0;
}
double LogNormal(double x,double miu,double sigma) //¶ÔÊýÕý̬·Ö²¼¸ÅÂÊÃܶȺ¯Êý
{
return 1.0/(x*sqrt(2*PI)*sigma) * exp(-1*(log(x)-miu)*(log(x)-miu)/(2*sigma*sigma));
}
extern "C" __declspec(dllexport) double __stdcall Random_LogNormal(double miu,double sigma,double min,double max)//²úÉú¶ÔÊýÕý̬·Ö²¼Ëæ»úÊý
{

double x;
double dScope;
double y;
do
{
x = AverageRandom(min,max);
y = LogNormal(x, miu, sigma);
dScope = AverageRandom(0, LogNormal(miu,miu,sigma));
}while( dScope > y);
return x;
}
2.C#ÖдúÂë
  //ͨ¹ýDllImportÒýÓÃlog.dllÀà¡£Random_LogNormalÀ´×ÔÓÚlog.dllÀà
    [DllImport("log.dll", EntryPoint = "Random_LogNormal")]
    public static extern double Random_LogNormal(double miu, double sigma, double min, double max);
using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.InteropServices;
class Program
{
///****************************************************
/// ²úÉúN=100¸öÔÚ£¨0,50£©Çø¼äÄÚÂú×ã¶ÔÊýÕý̬·Ö²¼µÄËæ»úÊý
///*****************************************************/
const int N = 100;
const int MAX = 30;
const double MIN = 0.5;