Halcon C#联合编程的一种异常的解决方法

源码为超人视觉联合C#启蒙班中的示例代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using HalconDotNet;

namespace test
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        HObject ho_Image4, ho_GrayImage, ho_Regions;
        HTuple hv_WindowHandle = new HTuple();
        private void button1_Click(object sender, EventArgs e)
        {
            string ImagePath;
            openFileDialog1.Filter = "JPEG文件|*.jpg*|BMP文件|*.bmp*";
            openFileDialog1.RestoreDirectory = true;
            HOperatorSet.GenEmptyObj(out ho_Image4);
            HOperatorSet.GenEmptyObj(out ho_GrayImage);
            HOperatorSet.GenEmptyObj(out ho_Regions);
            ho_Image4.Dispose();
            
            if(openFileDialog1.ShowDialog()==DialogResult.OK)
            {
                ImagePath = openFileDialog1.FileName;
                HOperatorSet.ReadImage(out ho_Image4, ImagePath);
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            HOperatorSet.OpenWindow(0, 0, hWindowControl1.Width, hWindowControl1.Height,hWindowControl1.HalconWindow, "visible", "", out hv_WindowHandle);//open window,将图片的长宽改为控件的长宽
            HDevWindowStack.Push(hv_WindowHandle);//入栈
            ho_GrayImage.Dispose();
            HOperatorSet.Rgb1ToGray(ho_Image4, out ho_GrayImage);
            ho_Regions.Dispose();
            HOperatorSet.Threshold(ho_GrayImage, out ho_Regions, 208, 255);
            if (HDevWindowStack.IsOpen())
            {
                HOperatorSet.DispObj(ho_Regions, HDevWindowStack.GetActive());
            }
        }
    }
}

窗体如下：

实际运行时出现以下异常：“HalconDotNet.HOperatorException”类型的未经处理的异常在 halcondotnet.dll 中发生

解决方法：将目标框架改为.NetFramework 4

更改框架后运行良好：