将上传图片文件转成二进制流再存储

 protected void Button1_Click(object sender, EventArgs e)
        {
            byte[] bt = SetImageToByteArray(FileUpload1);//将上传文件转换成byte[]数组
            if (bt != null)
            {
                string programPath = System.AppDomain.CurrentDomain.BaseDirectory.ToString();//获取当前项目路径
                string picname = DateTime.Now.ToString("yyyyMMddHHmmss") + new Random().Next(1000, 9999) + ".jpg";
                string path = programPath +"image/"+ picname;//文件存储路径
                MemoryStream ms = new MemoryStream(bt);//将byte[]数组存入内存流
                FileStream fs = new FileStream(path, FileMode.Create);//创建文件流
                ms.WriteTo(fs);//将内存流写入文件流
                System.Drawing.Image image = System.Drawing.Image.FromStream(fs, true);//将文件流转成image对象类型
                image.Save(fs, System.Drawing.Imaging.ImageFormat.Jpeg);//存储对象
                ms.Close();
                fs.Close();
                ms = null;
                fs = null;
                Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('ok!')</script>");
            }
        }
        public byte[] SetImageToByteArray(FileUpload FileUpload1)
        {
            string fileExtension = System.IO.Path.GetExtension(FileUpload1.FileName).ToLower();//获取文件类型
            if (fileExtension == ".jpg")
            {
                Stream stream = FileUpload1.PostedFile.InputStream;
                byte[] photo = new byte[FileUpload1.PostedFile.ContentLength];
                stream.Read(photo, 0, FileUpload1.PostedFile.ContentLength);
                stream.Close();
                return photo;
            }
            else
            { 
                byte[] bt=null;
                return bt;
            }
        }