学习笔记--winform将一个控件的计算结果转移到另一个控件

（目前想到2种方法，读者如果有更好的方法，欢迎评论区交流）

思路1：先保存计算结果，再用另一个控件进行读取

using System;
using OpenCvSharp;
using OpenCvSharp.Extensions;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Windows.Media.Imaging;
using OpenCvSharp.Flann;
using System.Windows.Media;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {


        public Form1()
        {
            InitializeComponent();
        
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //MessageBox.Show("请选择输入图片");
            OpenFileDialog open = new OpenFileDialog();
            open.Filter = "Open DataFile | *.bmp;*.jpg;";
            open.Title = "Open DataFile";
            open.AddExtension = false;
            open.CheckFileExists = true;
            open.DereferenceLinks = true;
            open.Multiselect = false;
        
            if (open.ShowDialog() == DialogResult.OK)
            {
                String path = open.FileName;
                Mat image = Cv2.ImRead(path);
                Mat[] BGR;
                Cv2.Split(image, out BGR);

           

                //创建三个bitmap对象，分别对应BGR三通道的图像数据
                Bitmap B = BGR[0].ToBitmap();
                Bitmap G = BGR[1].ToBitmap();
                Bitmap R = BGR[2].ToBitmap();

                //保存图片到磁盘
                B.Save("./tu/B通道图像.bmp");
                G.Save("./tu/G通道图像.bmp");
                R.Save("./tu/R通道图像.bmp");

                //调整图片大小以适应窗口
                pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;

                //显示图片
                pictureBox1.Image = Image.FromFile(open.FileName);
               
                comboBox1.Enabled = true;
            }



        }
        


        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            //comboBox1.SelectedIndex 获取或设置指定当前选定项的索引。
            //MessageBox.Show("当前选择框的选中值：" + (comboBox1.SelectedIndex + 1).ToString());
                //显示图片
                if (comboBox1.SelectedIndex == 0)
            {
                pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
                pictureBox1.Image = Image.FromFile("./tu/B通道图像.bmp");
                }
                if (comboBox1.SelectedIndex == 1)
                {
                pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
                pictureBox1.Image = Image.FromFile("./tu/G通道图像.bmp");
                }   
                if (comboBox1.SelectedIndex == 2)
                {
                pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
                pictureBox1.Image = Image.FromFile("./tu/R通道图像.bmp");
                }
            } 

        }
 }

方法2：声明一个变量

using System;
using OpenCvSharp;
using OpenCvSharp.Extensions;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Windows.Media.Imaging;
using OpenCvSharp.Flann;
using System.Windows.Media;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        Bitmap B;
        Bitmap G;
        Bitmap R;

        public Form1()
        {
            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)
        {
            //MessageBox.Show("请选择输入图片");
            OpenFileDialog open = new OpenFileDialog();
            open.Filter = "Open DataFile | *.bmp;*.jpg;";
            open.Title = "Open DataFile";
            open.AddExtension = false;
            open.CheckFileExists = true;
            open.DereferenceLinks = true;
            open.Multiselect = false;

            if (open.ShowDialog() == DialogResult.OK)
            {
                String path = open.FileName;
                Mat image = Cv2.ImRead(path);
                Mat[] BGR;
                Cv2.Split(image, out BGR);



                //创建三个bitmap对象，分别对应BGR三通道的图像数据
                B = BGR[0].ToBitmap();
                G = BGR[1].ToBitmap();
                R = BGR[2].ToBitmap();


                //调整图片大小以适应窗口
                pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;

                //显示图片
                pictureBox1.Image = Image.FromFile(open.FileName);

                comboBox1.Enabled = true;
            }



        }



        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            //comboBox1.SelectedIndex 获取或设置指定当前选定项的索引。
            //MessageBox.Show("当前选择框的选中值：" + (comboBox1.SelectedIndex + 1).ToString());
            //显示图片
            if (comboBox1.SelectedIndex == 0)
            {
                pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
                pictureBox1.Image = B;
            }
            if (comboBox1.SelectedIndex == 1)
            {
                pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
                pictureBox1.Image = G;
            }
            if (comboBox1.SelectedIndex == 2)
            {
                pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
                pictureBox1.Image = R;
            }
        }

      

    }
}