二进制流读取图片

添加一个名为showImg.aspx文件，前台无需设计，仅需在后台添加以下代码

protected void Page_Load(object sender, EventArgs e)
        {
            string id = Request.QueryString["id"].ToString();  //获取id

            string connstr = "Data Source=WUXSG01\\SQLEXPRESS;uid=sa;pwd=test;DataBase=test1"; //连接数据库
            SqlConnection connection = new SqlConnection(connstr);


            SqlCommand cmd = new SqlCommand("select photo from test1 where id= '" + id + "'", connection);//查询
            connection.Open();
            byte[] imageData = (byte[])cmd.ExecuteScalar();//转换
            connection.Close();
            Response.OutputStream.Write(imageData, 0, imageData.Length);//输出
        }

如果要显示，则

Image1.ImageUrl = "ShowImg.aspx?id=" + id;