在asp.net中输出二进制图片，因为图片大小都不同，所以想能不能设置一下，在输出的时候设置图片的长和宽。以下是输出图片的代码。ImageHandl.ashx

 public void ProcessRequest(HttpContext context)  //输出产品预览图
        {
            string proid = context.Request.QueryString["ProID"];
            string connstring = WebConfigurationManager.ConnectionStrings["localjznywebestConnectionString"].ToString();
            string query1 = "SELECT ProductPhoto FROM table_products WHERE ProductID ='" + proid+"'";
            MySqlConnection con1 = new MySqlConnection(connstring);
            con1.Open();
            MySqlCommand cmd1 = new MySqlCommand(query1, con1);
            MySqlDataReader dr = cmd1.ExecuteReader();//问题语句 此句不通导致不能显示图片
            dr.Read();
            context.Response.BinaryWrite((Byte[])dr[0]);
            con1.Close();
            context.Response.End();
        }