如何在c#中从数据库中检索图像

错误显示我说这个代码的参数无效…
任何人都可以告诉我什么是错的？我应该将图像分配给clientID.

private void button1_Click(object sender, EventArgs e)
{
        MySqlConnection conn = new MySqlConnection(mycon);
        MySqlCommand cmd = new MySqlCommand("SELECT clientImage FROM client WHERE clientID='" + label2.Text + "'", conn);

        conn.Open();
        MySqlDataReader myReader = null;
        myReader = cmd.ExecuteReader();

        while (myReader.Read())
        {
            byte[] imgg = (byte[])(myReader["clientImage"]);
            if (imgg == null)
            {
                pictureBox1.Image = null;
            }
            else
            {
                MemoryStream mstream = new MemoryStream(imgg);
                pictureBox1.Image = System.Drawing.Image.FromStream(mstream);
            }
        }
        conn.Close();
}

解决方法:

这段代码可能会派上用场.我试过了.

byte[] imagedata = (byte [])dataGridView1[4, dataGridView1.SelectedRows[0].Index].Value;
            using (System.IO.MemoryStream ms = new System.IO.MemoryStream(imagedata, 0, imagedata.Length))
            {
                ms.Write(imagedata, 0, imagedata.Length);
                //Set image variable value using memory stream.
                image = Image.FromStream(ms, true );
            }

标签：picturebox,mysql,visual-studio-2013,c-2
来源： https://codeday.me/bug/20191003/1848167.html