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");
 
             }

上传图片的方法

   //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,,img.Length);
             ms.Write(img,,img.Length);
             Image image = Image.FromStream(ms);
             this.pictureBox1.SizeMode = PictureBoxSizeMode.Zoom;
             this.pictureBox1.Image = image;
         }

从数据库显示图片的方法