这种需求算有点难度吧，在这里贴出一个实现以供参考：

C++部分：头文件

// 下列 ifdef 块是创建使从 DLL 导出更简单的
// 宏的标准方法。此 DLL 中的所有文件都是用命令行上定义的 CALCULATE_EXPORTS
// 符号编译的。在使用此 DLL 的
// 任何项目上不应定义此符号。这样，源文件中包含此文件的任何其他项目都会将
// CALCULATE_API 函数视为是从 DLL 导入的，而此 DLL 则将用此宏定义的
// 符号视为是被导出的。#ifndef _Calculate_
#define _Calculate_#include <stdlib.h>#ifdef CALCULATE_EXPORTS
#define CALCULATE_API extern "C" __declspec(dllexport)
#else
#define CALCULATE_API __declspec(dllimport)
#endiftypedef intptr_t  IntPtr;CALCULATE_API int MultiGray(double st_high,double st_low,IntPtr* P_inflect_handle,int** P_inflect,int* P_inflect_Len,double set_max,double set_min,double response_setTime,IntPtr* P_mid_handle,int** P_mid,int* P_mid_Len,IntPtr* flag_handle,int** flag,int* flag_Len,int jump_edge,int tcon_OD_up,int tcon_OD_down,IntPtr* P_left_handle,int** P_left,int* P_left_Len,IntPtr* P_right_handle,int** P_right,int* P_right_Len,int freq,double response
);
CALCULATE_API bool ReleaseObject(IntPtr handle);#endif

C++部分：函数实现

// Calculate.cpp : 定义 DLL 的导出函数。
//#include "pch.h"
#include "framework.h"
#include "Calculate.h"
#include <vector>
using namespace std;CALCULATE_API int MultiGray(double st_high,double st_low,IntPtr* P_inflect_handle,int** P_inflect,int* P_inflect_Len,double set_max,double set_min,double response_setTime,IntPtr* P_mid_handle,int** P_mid,int* P_mid_Len,IntPtr* flag_handle,int** flag,int* flag_Len,int jump_edge,int tcon_OD_up,int tcon_OD_down,IntPtr* P_left_handle,int** P_left,int* P_left_Len,IntPtr* P_right_handle,int** P_right,int* P_right_Len,int freq,double response
)
{int count = 100000;auto array1 = new std::vector<int>();for (int i = 0; i < count; i++){array1->push_back(i);}*P_inflect_handle = reinterpret_cast<IntPtr>(array1);*P_inflect = array1->data();*P_inflect_Len = count;auto array2 = new std::vector<int>();for (int i = 0; i < count; i++){array2->push_back(i);}*P_mid_handle = reinterpret_cast<IntPtr>(array2);*P_mid = array2->data();*P_mid_Len = count;auto array3 = new std::vector<int>();for (int i = 0; i < count; i++){array3->push_back(i);}*flag_handle = reinterpret_cast<IntPtr>(array3);*flag = array3->data();*flag_Len = count;auto array4 = new std::vector<int>();for (int i = 0; i < count; i++){array4->push_back(i);}*P_left_handle = reinterpret_cast<IntPtr>(array4);*P_left = array4->data();*P_left_Len = count;auto array5 = new std::vector<int>();for (int i = 0; i < count; i++){array5->push_back(i);}*P_right_handle = reinterpret_cast<IntPtr>(array5);*P_right = array5->data();*P_right_Len = count;return 0;
}CALCULATE_API bool ReleaseObject(IntPtr handle)
{std::vector<int>* object = reinterpret_cast<std::vector<int>*>(handle);delete object;return true;
}

C# 部分：

 public class SafeHandle : SafeHandleZeroOrMinusOneIsInvalid{public SafeHandle(): base(true){}protected override bool ReleaseHandle(){return ReleaseObject(handle);}[DllImport("Calculate.dll", CallingConvention = CallingConvention.Cdecl)]static unsafe extern bool ReleaseObject(IntPtr handle);}public class Performer{[DllImport("Calculate.dll", EntryPoint = "MultiGray", CallingConvention = CallingConvention.Cdecl)]unsafe extern static int MultiGray(double st_high,double st_low,out SafeHandle handle1,out int* P_inflect,out int P_inflect_Len,double set_max,double set_min,double response_setTime,out SafeHandle handle2,out int* P_mid,out int P_mid_Len,out SafeHandle handle3,out int* flag,out int flag_Len,int jump_edge,int tcon_OD_up,int tcon_OD_down,out SafeHandle handle4,out int* P_left,out int P_left_Len,out SafeHandle handle5,out int* P_right,out int P_right_Len,int freq,double response);public unsafe ReturnData Excute(double st_high,double st_low,out SafeHandle handle1,out int* P_inflect,out int P_inflect_Len,double set_max,double set_min,double response_setTime,out SafeHandle handle2,out int* P_mid,out int P_mid_Len,out SafeHandle handle3,out int* flag,out int flag_Len,int jump_edge,int tcon_OD_up,int tcon_OD_down,out SafeHandle handle4,out int* P_left,out int P_left_Len,out SafeHandle handle5,out int* P_right,out int P_right_Len,int freq,double response){int result = MultiGray(st_high,st_low,out handle1,out P_inflect,out P_inflect_Len,set_max,set_min,response_setTime,out handle2,out P_mid,out P_mid_Len,out handle3,out flag,out flag_Len,jump_edge,tcon_OD_up,tcon_OD_down,out handle4,out P_left,out P_left_Len,out handle5,out P_right,out P_right_Len,freq,response);ReturnData data = new ReturnData();data.flag_Len = flag_Len;data.flag = new int[flag_Len];for(int i=0;i<flag_Len;i++){data.flag[i] = flag[i];}data.freq = freq;data.jump_edge = jump_edge;data.P_inflect_Len = P_inflect_Len;data.P_inflect = new int[P_inflect_Len];for(int i=0;i<P_inflect_Len;i++){data.P_inflect[i] = P_inflect[i];}data.P_left_Len = P_left_Len;data.P_left = new int[P_left_Len];for(int i=0;i<P_left_Len;i++){data.P_left[i] = P_left[i];}data.P_mid_Len = P_mid_Len;data.P_mid = new int[P_mid_Len];for(int i=0;i<P_mid_Len;i++){data.P_mid[i] = P_mid[i];}data.P_right_Len = P_right_Len;data.P_right = new int[P_right_Len];for(int i=0;i<P_right_Len;i++){data.P_right[i] = P_right[i];}data.response = response;data.response_setTime = response_setTime;data.set_max = set_max;data.set_min = set_min;data.st_high = st_high;data.st_low = st_low;data.tcon_OD_down = tcon_OD_down;data.tcon_OD_up = tcon_OD_up;handle1.Dispose();handle2.Dispose();handle3.Dispose();handle4.Dispose();handle5.Dispose();return data;}}public class ReturnData{public double st_high;public double st_low;public int[] P_inflect;public int P_inflect_Len;public double set_max;public double set_min;public double response_setTime;public int[] P_mid;public int P_mid_Len;public int[] flag;public int flag_Len;public int jump_edge;public int tcon_OD_up;public int tcon_OD_down;public int[] P_left;public int P_left_Len;public int[] P_right;public int P_right_Len;public int freq;public double response;}