C# 图片

class PublicMethod
    {
        /// <summary>
        /// 读取图片到byte[]
        /// </summary>
        /// <param name="pb"></param>
        /// <returns></returns>
        public byte[] readImagetoByte(PictureBox pb)
        {
            byte[] photoByte = null;
            if (pb.Image != null)
            {
                using (MemoryStream ms = new MemoryStream())
                {
                    Bitmap bmp = new Bitmap(pb.Image);
                    bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
                    photoByte = new byte[ms.Length];
                    ms.Position = 0;
                    ms.Read(photoByte, 0, Convert.ToInt32(ms.Length));
                    bmp.Dispose();
                }
            }
            return photoByte;
        }

        /// <summary>
        /// 读取指定目录下的图片到byte[]
        /// </summary>
        /// <param name="strFile"></param>
        /// <returns></returns>
        public byte[] getBytesByImagePath(string strFile)
        {
            byte[] photo_byte = null;
            using (FileStream fs = new FileStream(strFile, FileMode.Open, FileAccess.Read))
            {
                using (BinaryReader br = new BinaryReader(fs))
                {
                    photo_byte = br.ReadBytes((int)fs.Length);
                }
            }
            return photo_byte;
        }

        /// <summary>
        /// 从byte[]读取图片
        /// </summary>
        /// <param name="bytes"></param>
        /// <returns></returns>
        public Image getImageByBytes(byte[] bytes) 
        { 
            Image photo = null; 
            using (MemoryStream ms = new MemoryStream(bytes))
            { 
                ms.Write(bytes, 0, bytes.Length);
                photo = Image.FromStream(ms, true); 
            } 
            return photo;
        }
    }

 #region 将图片转换成字节数组
        /// <summary>
        /// 将图片转换成字节数组
        /// </summary>
        /// <param name="OpenF"></param>
        /// <param name="pb"></param>
        public void Read_ImageToByte(OpenFileDialog OpenF, PictureBox pb)
        {
            OpenF.Filter = "*.jpg|*.jpg|*.bmp|*.bmp";//指定OpenFileDialog控件打开的文件格式
            if (OpenF.ShowDialog(this) == DialogResult.OK)//如果打开了图片文件
            {
                try
                {
                    pb.Image = System.Drawing.Image.FromFile(OpenF.FileName);//将图片文件存入到PictureBox控件中
                    string Picpath = OpenF.FileName.ToString();
                    FileStream fs = new FileStream(Picpath, FileMode.Open, FileAccess.Read);
                    BinaryReader br = new BinaryReader(fs);
                    imgBytesIn = br.ReadBytes((int)fs.Length);
                }
                catch
                {
                    MessageBox.Show("您选择的图片不能被读取或文件类型不对！", "错误", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                    pb.Image = null;
                }
            }
        }
        #endregion

#region 将图片存储到数据库中
         /// <summary>
        /// 以二进制的形式将图片存储到数据库中.
        /// </summary>
        /// <param name="MID">职工编号</param>
        /// <param name="p">图片的二进制形式</param>
        public void SaveImage(string MID, byte[] p)
        {
            MyDataClass.Con_Open();
            StringBuilder SqlStr = new StringBuilder();
            SqlStr.Append("update tb_Staffbasic Set Photo=@Photo where ID=" + MID);
            SqlCommand cmd = new SqlCommand(SqlStr.ToString(), DataClass.MyMeans.My_con);
            cmd.Parameters.Add("@Photo", SqlDbType.Binary).Value = p;
            cmd.ExecuteNonQuery();
            MyDataClass.Con_Close();
        }
        #endregion