Question

我正在为我的最后一年开发一个ASP.NET项目，目前正在开发＃34; Admin＆＃34;模块，我被困在下面给出的这部分代码中。我正在获取＆＃34;服务＆＃34;的对象。通过方法＆＃34; SelectByID（int id）＆＃34;通过Business Logic。此方法返回＆＃34; Service＆＃34;的对象。现在，当我将此对象存储到Session中并查看对象的属性时，ID将存储为＆＃39; 0＆＃39;。我需要在同一页面的另一种方法中使用此ID，我将通过FileUploadControl更改显示图片。我附上了我的方法代码，方法的C＃代码，以及对象属性的屏幕截图。

<pre><code>public Service SelectByID(int ServiceID) 
        {
            string query = "select * from tblService where ServiceID=@ServiceID ";
            List<SqlParameter> lstParams = new List<SqlParameter>();

            lstParams.Add(new SqlParameter("@ServiceID", ServiceID));

            DataTable dt = DBUtility.SelectData(query, lstParams);

            Service serviceObj = new Service();
            if (dt.Rows.Count > 0)
            {
                serviceObj.Name = dt.Rows[0]["Name"].ToString();
                serviceObj.Description = dt.Rows[0]["Description"].ToString();
                serviceObj.Photo = dt.Rows[0]["Photo"].ToString();
            }

            return serviceObj;

        }

//Page Load Code 
protected void Page_Load(object sender, EventArgs e)
    {
        if (Session["admin"] != null)
        {
            if (!IsPostBack)
            {
                ServiceLogic serviceLogic = new ServiceLogic();
                int id = Convert.ToInt32(Request.QueryString["Id"]); // Here ID is recieved properly from QueryString
                Service service = serviceLogic.SelectByID(id); //Here too ID is recieved(obviously)
                Session["service"] = service; //Here the ServiceID is storing  '0'
                lblService.Text = service.Name;
                txtServiceName.Text = service.Name;
                txtDescription.Text = service.Description;

                if (service.Photo == "")
                {
                    imgService.ImageUrl = "~/Images/defaultVendor.png";
                }
                else
                {
                    imgService.ImageUrl = service.Photo;
                }
            }
        }

        else
        {
            Response.Redirect("AdminLogin.aspx");
        }


    }

//Update profile pic code. Assume the above code where file extensions and file size are checked!
                  {
                    string filePath = Server.MapPath("~/Images/ServicesPhoto/" + fuServiceImage.FileName);
                    fuServiceImage.SaveAs(filePath);

                    lblServiceUpdate.Text = "Display Picture Changed Successfully!";
                    lblServiceUpdate.ForeColor = System.Drawing.Color.Green;

                    string imagePath = "~/Images/ProfilePics/" + fuServiceImage.FileName;
                    imgService.ImageUrl = imagePath;

                    Service service = (Service)Session["service"];

                    serviceLogic.updateServiceImage(imagePath, service.ServiceID);
                    service.Photo = imagePath;

                    lblService.Text = service.Name;
                    txtServiceName.Text = service.Name;
                    txtDescription.Text = service.Description;
                    imgService.ImageUrl = service.Photo;
                    //Response.Redirect("ServiceDetails.aspx");
           }

Answer 1

您必须从服务方法

获取ID

public Service SelectByID(int ServiceID) 
    {
        string query = "select * from tblService where ServiceID=@ServiceID ";
        List<SqlParameter> lstParams = new List<SqlParameter>();

        lstParams.Add(new SqlParameter("@ServiceID", ServiceID));

        DataTable dt = DBUtility.SelectData(query, lstParams);

        Service serviceObj = new Service();
        if (dt.Rows.Count > 0)
        {
            serviceObj.ID = dt.Rows[0]["ServiceID"].ToString();
            serviceObj.Name = dt.Rows[0]["Name"].ToString();
            serviceObj.Description = dt.Rows[0]["Description"].ToString();
            serviceObj.Photo = dt.Rows[0]["Photo"].ToString();
        }

        return serviceObj;

    }

在服务数据获取方法中添加ID对象

 serviceObj.ID = dt.Rows[0]["ServiceID"].ToString();

Answer 2

您似乎没有获取并将Id存储到Service对象中。

尝试以下方法：

    public Service SelectByID(int ServiceID) 
    {


        string query = "select * from tblService where ServiceID=@ServiceID ";
        List<SqlParameter> lstParams = new List<SqlParameter>();

        lstParams.Add(new SqlParameter("@ServiceID", ServiceID));

        DataTable dt = DBUtility.SelectData(query, lstParams);

        Service serviceObj = new Service();
        if (dt.Rows.Count > 0)
        {
            serviceObj.ID = dt.Rows[0]["ID"].ToString();

            // Or you can use
            // serviceObj.ID = ServiceID;
            serviceObj.Name = dt.Rows[0]["Name"].ToString();
            serviceObj.Description = dt.Rows[0]["Description"].ToString();
            serviceObj.Photo = dt.Rows[0]["Photo"].ToString();
        }

        return serviceObj;

    }

请不要忘记标记它是否可以解决您的问题。

当我在会话中存储时，ID会在QueryString bt中传递，它存储为'0'

2 个答案: