C# 对象被占用无法调用

Question

①openCVsharp 调用2个摄像头读取图像
②倒计时触发保存图像
③保存时会提示对象被占用无法使用问题private void CaptureRead(VideoCapture capture, PictureBox picture,ENM_CAPTURE eNM_CAPTURE)
        {
            //首先定义face_token表示为空
            //人脸检测
            using (Mat frame = new Mat())
            {
                int i = 0;
                while (!canel)
                {
                    try
                    {
                        if (!capture.IsOpened()) capture.Open((int)eNM_CAPTURE);                        //读取图片信息
                        if (capture.Read(frame))
                        {
                            if (frame.Empty()) return;                            picture.Image = Image.FromStream(new MemoryStream(frame.ToBytes()));
                  
                            Thread.Sleep(60);                            i++;
                        }
                    }
                    catch (Exception ex)
                    {
                        baseLogger.Error(ex.Message);
                        continue;
                    }
                }
            }
        }
               using (var img = pictureBox2.Image)
                {
                    M_IMG iMG1 = new M_IMG();
                    iMG1.im_name = $"{montion.id}_F_{_SN.sn}.jpg";
                    iMG1.im_base64 = ImageBase64(img);
                    _SN.images.Add(iMG1);
                }
                using (var img = pictureBox3.Image)
                {
                    M_IMG iMG2 = new M_IMG();                    iMG2.im_name = $"{montion.id}_S_{_SN.sn}.jpg";
                    iMG2.im_base64 = ImageBase64(img);                
                    _SN.images.Add(iMG2);
                }
       private string ImageBase64(Image img)
        {
            byte[] arr = null;
            try
            {
                using (MemoryStream ms = new MemoryStream())
                {
                    img.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
                    arr = new byte[ms.Length];
                    ms.Position = 0;
                    ms.Read(arr, 0, (int)ms.Length);
                    ms.Close();              
                }
            }
            catch (Exception ex)
            {
                baseLogger.Error(ex.Message);
                AutoClosingMessageBox.Show(ex.Message, "错误", 3000);
            }
            return Convert.ToBase64String(arr);
        }

Answer 1

picture.Image = Image.FromStream(new MemoryStream(frame.ToBytes()));这句，会让对象一直占用此图片流：
解决方法：（以下是我在WPF中的解决方法，你根据自身情况解决）读取流之后，对流对象进行一次Clone，然后，用复本赋值界面控件： Image image = Image.FromFile(x.FullName);
 Image x1 = (Image)(image.Clone());image.Dispose();//释放原始文件//之后使用x1进行操作，完成之后，对x1进行释放，如我在WPF中使用的所示