从数据库中读取图像并通过 Web 服务发送

Question

我的数据库中有一个包含系统用户数据的表，其中一个数据是个人资料图片， 我正在尝试读取这些数据并使用网络服务将其发送到智能手机，

我尝试了以下代码，但没有成功

        public User select(string username, string password)
    {

        SqlCommand myCommand = new SqlCommand("select * from users where userName = @uname and password = @pwd or email = @uname and password = @pwd");


        myCommand.Parameters.AddWithValue("@uname", username);
        myCommand.Parameters.AddWithValue("@pwd", password);

        DBAccess db = new DBAccess();
        DataSet ds = db.select(myCommand);

        User user = new User();
        DataRow dr;

        try
        {                
            dr = ds.Tables[0].Rows[0];

            user.Id = Convert.ToInt32(dr["userID"]);                
            user.FirstName = (string)dr["firstName"]+" ";
            user.LastName = (string)dr["lastName"] + " ";
            user.Email = (string)dr["email"] + " ";
            user.Username = (string)dr["userName"];
            user.Password = (string)dr["password"];
            user.type = (string)dr["type"];
            user.followingID = Convert.ToInt32(dr["followingID"]);
            user.theme = Convert.ToInt32(dr["theme"]);
            user.tel = (string)dr["tel"] + " ";
            user.mobile = (string)dr["mobile"] + " ";
            user.fax = (string)dr["fax"] + " ";
            user.lastLoggedIn = Convert.ToDateTime(dr["lastLoggedIn"]);
            user.image = Convert.ToByte[](dr["Image"]);

            return user;
        }
        catch (Exception ex)
        {
            DAO.exDao myEx = new DAO.exDao();

            return null;
        }
    }//end of select method

我不知道如何从数据库中读取图像并将其保存为字节数组以发送 throw web 服务，所以下一行出现错误

user.image = Convert.ToByte[](dr["Image"]);

Answer 1

您可以将图像的路径存储在数据库中。然后在检索到您可以显示图像之后。