02-20 winform 上传图片并读取图片

建立一个windows窗体应用程序，在form1界面中拖入两个按钮和一个pictureBox，通过输入输出流来上传图片和显示图片。需要添加一下openFileDialog1.

界面如下：

在cs中写上传和显示图片的方法

 //上传图片
        private void button1_Click(object sender, EventArgs e)
        {
            //图片的转化
            openFileDialog1.Filter = "*jpg|*.jpg|*bmp|*.bmp|*gif|*.gif";//设置图片另存为文件类型格式，filter是文件筛选器
            DialogResult da = openFileDialog1.ShowDialog();
            if(da==DialogResult.OK)
            {
                string fil = openFileDialog1.FileName;
                FileStream fs = new FileStream(fil,FileMode.Open,FileAccess.Read);
                byte[] img=new byte[fs.Length];
                BinaryReader br = new BinaryReader(fs);//二进制读取器
                img = br.ReadBytes(Convert.ToInt32(fs.Length));
                //链接数据库
               SqlConnection conn = new SqlConnection("server=.;database=newData;user=sa;pwd=123");
               conn.Open();
               SqlCommand cmd = conn.CreateCommand();
               cmd.CommandText = "insert into Table_1 values(@image)";
               cmd.Parameters.Clear();
               cmd.Parameters.Add("@image",img);
               cmd.ExecuteNonQuery();
               conn.Close();
               MessageBox.Show("上传成功");

            }

  //从数据库中读取图片
        private void button2_Click(object sender, EventArgs e)
        {
            SqlConnection conn = new SqlConnection("server=.;database=newData;user=sa;pwd=123");
            conn.Open();
            SqlCommand cmd = conn.CreateCommand();
            cmd.CommandText = "select top 1*from Table_1";
            SqlDataReader dr = cmd.ExecuteReader();
            dr.Read();
            byte[] img = (byte[])dr["Ino"];
           // byte[] img1=(byte[])dr["Ino"];
            MemoryStream ms = new MemoryStream(img,0,img.Length);
            ms.Write(img,0,img.Length);
            Image image = Image.FromStream(ms);
            this.pictureBox1.SizeMode = PictureBoxSizeMode.Zoom;
            this.pictureBox1.Image = image;
        }