C# winfrom 存取图片到数据库（二进制，image）

1.读取本地图片到PictureBox

 public void InageShow(PictureBox PB)
        {
            OpenFileDialog openfile = new OpenFileDialog();
            openfile.Title = " 请选择客户端longin的图片";
            openfile.Filter = "Login图片 (*.jpg;*.bmp;*png)|*.jpeg;*.jpg;*.bmp;*.png|AllFiles(*.*)|*.*";
            if (DialogResult.OK == openfile.ShowDialog())
            {
                try
                {
                    Bitmap bmp = new Bitmap(openfile.FileName);
                    pictureBox1.Image = bmp;
                    pictureBox1.SizeMode = PictureBoxSizeMode.Zoom;

                   //字面是对当前图片进行了二进制转换
                    MemoryStream ms = new MemoryStream();
                    bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
                    byte[] arr = new byte[ms.Length];
                    ms.Position = 0;
                    ms.Read(arr, 0, (int)ms.Length);
                    ms.Close();
                    //直接返这个值放到数据就行了
                   string ee = Convert.ToBase64String(arr);
                }
                catch { }
            }
        }

2.根据图片路径将本地图片存入数据库

        private void button2_Click(object sender, EventArgs e)
        {
            //获取用户打开的路径然转换成二进制存入数据库
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.Filter = "*jpg|*.JPG|*.GIF|*.GIF|*.BMP|*.BMP";

            if (ofd.ShowDialog() == DialogResult.OK)
            {
                string filePath = ofd.FileName;//图片路径
                FileStream fs = new FileStream(filePath, FileMode.Open);
                byte[] imageBytes = new byte[fs.Length];
                BinaryReader br = new BinaryReader(fs);
                imageBytes = br.ReadBytes(Convert.ToInt32(fs.Length));//图片转换成二进制流

                string strSql = string.Format("insert into [PointSchool].[dbo].[Table_Image] ([image]) values (@image)");
                int count = Write(strSql, imageBytes);

                if (count > 0)
                {
                    MessageBox.Show("成功！");
                }
                else
                {
                    MessageBox.Show("失败！");
                }
            }

        }

        private int Write(string strSql, byte[] imageBytes)
        {
            string connStr = "server=.;database=PointSchool;User =sa; pwd =123";

            using (SqlConnection conn = new SqlConnection(connStr))
            {
                using (SqlCommand cmd = new SqlCommand(strSql, conn))
                {
                    try
                    {
                        conn.Open();
                        SqlParameter sqlParameter = new SqlParameter("@image", SqlDbType.Image);
                        sqlParameter.Value = imageBytes;
                        cmd.Parameters.Add(sqlParameter);
                        int rows = cmd.ExecuteNonQuery();
                        return rows;
                    }
                    catch (Exception e)
                    {
                        throw;
                    }
                }
            }
        }

3.picturebox的Image 转换成二进制存入数据库

    public byte[] PhotoImageInsert(System.Drawing.Image imgPhoto)
        {
            //将Image转换成流数据，并保存为byte[] 
            MemoryStream mstream = new MemoryStream();
            imgPhoto.Save(mstream, System.Drawing.Imaging.ImageFormat.Bmp);
            byte[] byData = new Byte[mstream.Length];
            mstream.Position = 0;
            mstream.Read(byData, 0, byData.Length);
            mstream.Close();
            return byData;
        }

  string strSql = string.Format("insert into [PointSchool].[dbo].[Table_Image] ([image]) values (@image)");
            int count = Write(strSql, BBBB);
            if (count > 0)
            {
                MessageBox.Show("成功！");
            }
            else
            {
                MessageBox.Show("失败！");
            }

注：添加方法在上面

 4.读取二进制转换成图片

        public void PicboxShow(PictureBox pictureBox2)
        {
            byte[] imagebytes = null;

            //打开数据库

            SqlConnection con = new SqlConnection("server=.;database=PointSchool;User =sa; pwd =123");

            con.Open();

            SqlCommand com = new SqlCommand("select top 1* from Table_Image", con);

            SqlDataReader dr = com.ExecuteReader();

            while (dr.Read())
            {

                imagebytes = (byte[])dr.GetValue(1);

            }

            dr.Close();

            com.Clone();

            con.Close();

            MemoryStream ms = new MemoryStream(imagebytes);

            Bitmap bmpt = new Bitmap(ms);

            pictureBox2.Image = bmpt;

        }

   pictureBox2.SizeMode = PictureBoxSizeMode.Zoom;

界面图