Winform一段关于SQL存取图片的代码

需要用到

控件: openFileDialog  命名空间：using System.IO;  using System.Date.SqlClient;

存

        private void btnInsert_Click(object sender, EventArgs e)
        {
            openFileDialog1.Filter = "jpg图|*.jpg|png图|*.png|gif图|*.gif|所有文件|*.*";
            DialogResult isok = openFileDialog1.ShowDialog();

            if (isok == DialogResult.OK)
            {
                //开始使用流读取
                FileStream fs = new FileStream(openFileDialog1.FileName, FileMode.Open, FileAccess.Read);
                //使用流读取器，把文件流对象中的内容读取出来，转换成字符串或者其他对应的数据
                BinaryReader br = new BinaryReader(fs);//二进制读取器
                byte[] imgbytes = br.ReadBytes((int)fs.Length);//将流中数据读取成byte数组存入数组变量中

                //连接数据库，新增数据
                SqlConnection conn = new SqlConnection("server=.;database=Practice;user=sa;pwd=123");
                SqlCommand cmd = conn.CreateCommand();
                cmd.CommandText = "insert into Show values(@showId,@showImage)";
                cmd.Parameters.Clear();
                cmd.Parameters.AddWithValue("@showId", tboxLook.Text);
                cmd.Parameters.AddWithValue("@showImage", imgbytes);
                conn.Open();

                cmd.ExecuteNonQuery();

                conn.Close();

                MessageBox.Show("添加水果图片成功");
            }
        }

读取

        private void btnLook_Click(object sender, EventArgs e)
        {
            //连接数据库，新增数据
            SqlConnection conn = new SqlConnection("server=.;database=Practice;user=sa;pwd=123");
            SqlCommand cmd = conn.CreateCommand();
            cmd.CommandText = "select top 1 *from Show where showId=@showid";
            cmd.Parameters.Clear();
            cmd.Parameters.AddWithValue("@showId", tboxLook.Text);
            cmd.Parameters.AddWithValue("@showImage", tboxLook.Text);

            conn.Open();
            SqlDataReader dr = cmd.ExecuteReader();
            byte[] imgbytes = null;

            if (dr.Read())
            {
                imgbytes = (byte[])dr["showImage"];

                conn.Close();
                //如何把二进制数据，转换成一个Image类型，来给piceturebox赋值
                //内存流
                MemoryStream ms = new MemoryStream(imgbytes);
                Image img = Image.FromStream(ms);

                pboxShow.Image = img;
            }
            else
            { 
             MessageBox.Show("您查询的水果不存在");
            }           
        }

        //纯粹为了读取硬盘的图片
        private void btnChow_Click(object sender, EventArgs e)
        {
            openFileDialog1.Filter = "jpg图|*.jpg|png图|*.png|gif图|*.gif|所有文件|*.*";
            DialogResult isok = openFileDialog1.ShowDialog();

            if (isok == DialogResult.OK)
            {
                Image img = Image.FromFile(openFileDialog1.FileName);
                pboxShow.Image = img;
            }
        }