從類文件方法調用ASP.NET頁面方法

Question

我正在一個項目（ASP.NET網站）上，我需要從一個類中調用網頁中的方法。

///默認頁面方法為

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
       BLMethods objBLMethods = new BLMethods();
       objBLMethods.BindingDataToControls();
    }

    public void BindGridView(List<clsPerson> objPersonList)
    {                      
      GridView1.DataSource = objPersonList.ToList();
      GridView1.DataBind();
    }
}

`

類文件結構是

    public class BLMethods 
    {
        public BLMethods()
        {
          List<clsPerson> objPersonList = new List<clsPerson>();
          clsPerson objPerson = new clsPerson();
          objPerson.personID = i;
          objPerson.personName = "Person" + i;
          objPersonList.Add(objPerson);
          BindGridView(objPersonList);
        }
    }

clsPerson類別：

public class clsPerson 
{ 
    public int personID; 
    public string personName; 
}

如以上程序所示，我需要從BLMethods類的構造函數中調用頁面的BindGridView方法

Answer 1

我會反過來做。 將方法添加到類中（以GridView作為參數）：

public class BLMethods 
{
    public BLMethods(GridView gv)
    {
      List<clsPerson> objPersonList = new List<clsPerson>();
      clsPerson objPerson = new clsPerson();
      objPerson.personID = i;
      objPerson.personName = "Person" + i;
      objPersonList.Add(objPerson);
      BindGridView(gv,objPersonList);
    }
    private void BindGridView(GridView gv, List<clsPerson> objPersonList)
    {                      
      gv.DataSource = objPersonList.ToList();
      gv.DataBind();
    }
}

默認頁面方法為

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
       BLMethods objBLMethods = new BLMethods(GridView1);
       objBLMethods.BindingDataToControls();
    }

}

嘗試將getter和setter賦予clsPerson類屬性：

public class clsPerson 
{ 
    public int personID {get;set;} 
    public string personName {get;set;}
}

Answer 2

您應該只返回業務規則類的數據，並在類后面的代碼中綁定網格視圖。

您可以在將返回List<clsPerson>的類中創建方法，並在頁面加載時將其與girdview綁定：

public class BLMethods 
    {
        public BLMethods()
        {

        }

        public List<clsPerson> GetPersons()
        {
          List<clsPerson> objPersonList = new List<clsPerson>();
          clsPerson objPerson = new clsPerson();
          objPerson.personID = i;
          objPerson.personName = "Person" + i;
          objPersonList.Add(objPerson);

          return objPersonList ;
        }
    }

並在頁面后面的代碼中：

protected void Page_Load(object sender, EventArgs e)
    {
       BindGridView();
    }

    public void BindGridView()
    {             
      BLMethods objBLMethods = new BLMethods();
      GridView1.DataSource = objBLMethods.GetPersons();
      GridView1.DataBind();
    }

Answer 3

您應該設法正確分離您的關注點。 根據Ehsan Sajjad回答的評論和疑問：

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
       if (!new AuthenticationHelper().IsUserAuthorisedForPeople(Request.User.Identity))
       {
           Response.Redirect("NaughtyNaughty.aspx");
       }

       BindGridView();
    }

    public void BindGridView()
    {                      
      PersonHelper helper = new PersonHelper();
      GridView1.DataSource = helper.GetPeople();
      GridView1.DataBind();
    }
}

public class AuthenticationHelper()
{
     public bool IsUserAuthorisedForPeople(string userName) {
        return true; //Do your auth here.
     }
}

public class PersonHelper
{

    private void GetPeople()
    {                      
      List<clsPerson> objPersonList = new List<clsPerson>();

      //Populate your list of people.

      return objPersonList; 
      //BTW - hungarian notation for your naming is just going to make your 
      //code look cluttered...
    }
}

Answer 4

您必須采取其他方法。 您在BL中編寫了返回objPersonList的方法，該方法從頁面進行調用以進行綁定。