图片操作以后删除提示文件被线程占用解决办法

直接上代码

public class ImageHelper
    {
        /// <summary>
        /// 图片转Base64编号
        /// </summary>
        /// <param name="imageFile"></param>
        /// <returns></returns>
        public static string ImageToBase64(string imageFile)
        {
            using (FileStream fs = new FileStream(imageFile, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
            {
                //Bitmap bp = new Bitmap(imageFile);
                //bp.Save(m, ImageFormat.Png);
                //byte[] b = m.GetBuffer();
                //string base64String = Convert.ToBase64String(b);
                //m.Close();
                //m.Dispose();
                ////bp.Dispose();
                //return base64String;
                byte[] bytes = new byte[fs.Length];
                fs.Read(bytes, 0, bytes.Length);
                fs.Close();
                MemoryStream ms = new MemoryStream(bytes);
                Bitmap img = new Bitmap(ms);
                img.Save(ms,ImageFormat.Png);
                string base64String = Convert.ToBase64String(bytes);
                return base64String;
            }
            
            
        }

        /// <summary>
        /// Base64编号转为图片
        /// </summary>
        /// <param name="base64String"></param>
        /// <param name="fileName"></param>
        /// <param name="format"></param>
        public static void Base64ToImage(string base64String, string fileName, ImageFormat format)
        {
            byte[] bt = Convert.FromBase64String(base64String);
            using (MemoryStream stream = new MemoryStream(bt))
            {
                Bitmap bitmap = new Bitmap(stream);
                bitmap.Save(fileName, format);
                stream.Close();
                stream.Dispose();
            }
        }
    }