Using delegate with events

Question

Context: I have to create 4 pages where I will have to create 2 tables for each pages. Each table have the same structure and the only change is on the data that are loaded.

I did something similar for another page where I had to do 6 similar tables on a page. I used delegate on functions that give the differents data and I pass the function needed to my TableInit function. It works well ! :)

But now I'm thinking about doing a static class where I will put all my table generator function to be able tu put tables in severals page without having to copy paste all the function.

The problem is that I have a button somewhere in the table and that I fix an event located in the page.aspx on this button. And when I put my function in another static class I just can't find a way to pass my event.

I'm pasting here my initial code with everything in the Page with that question: How do you isolate the table generator function from the page ?

namespace Pointage
{
public delegate List<M_FICHE> delOnGetRecent(M_USER_POINTAGE p_user);
public partial class _Default : Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        tableInit(this.recentFicheDataTableHead, this.recentFicheDataTableBody, M_FICHE.getFiveRecentUserFiche);
        tableInit(this.recentFicheNeededCorrectDataTableHead, this.recentFicheNeededCorrectDataTableBody, M_FICHE.getFiveRecentUserFicheWithNeededCorrections);
        tableInit(this.recentFicheNeedApprovalDataTableHead, this.recentFicheNeedApprovalDataTableBody, M_FICHE.getFiveRecentUserFicheWithNeededApproval);
        tableInit(this.recentFicheNeededValidDataTableHead, this.recentFicheNeededValidDataTableBody, M_FICHE.getFiveRecentUserFicheWithNeededValidation);
        tableInit(this.recentErrorFicheDataTableHead, this.recentErrorFicheDataTableBody, M_FICHE.getFiveRecentErrorFiche);
        langInit();
    }

    //procédure d'initialisation des différents label prenant compte de la langue
    private void langInit()
    {
        // Useless for this problem
    }

    /// <summary>   Table init. </summary>
    ///
    /// <remarks>   G 0669144, 26/10/2016. </remarks>
    ///
    /// <param name="p_head">           The head. </param>
    /// <param name="p_body">           The body. </param>
    /// <param name="p_delOnGetRecent"> The delete on get recent method from M_FICHE. </param>
    /// <param name="p_link">           The link. </param>

    private void tableInit(HtmlGenericControl p_head, HtmlGenericControl p_body, delOnGetRecent p_delOnGetRecent)
    {
        List<M_FICHE> _listFiche = p_delOnGetRecent(new M_USER_POINTAGE(Convert.ToInt32(Session["id"])));
        if (_listFiche.Count == 0)
        {
            p_head.Controls.Clear();
            HtmlTableRow _row = new HtmlTableRow();
            HtmlTableCell _cell = new HtmlTableCell();
            _cell.InnerText = Resource.NO_RECENT_FICHE;
            _row.Controls.Add(_cell);
            p_head.Controls.Add(_row);
        }
        else
        {
            // HIDED CODE : creating thead code
            p_body.Controls.Clear();
            foreach (M_FICHE fiche in _listFiche)
            {
                //Création de la ligne du tableau
                HtmlTableRow _row = new HtmlTableRow();
                //Création de chaque cellules
                HtmlTableCell cell = new HtmlTableCell();
                M_USER_POINTAGE _user = M_USER_POINTAGE.getUserFromSGID(fiche.USER_SGID);
                cell.InnerText = String.Format("{0}. {1}", _user.NAME[0], _user.FIRSTNAME);
                _row.Controls.Add(cell);
                //Cellule data
                HtmlTableCell cell2 = new HtmlTableCell();
                cell2.InnerText = fiche.DATE_CREATE.ToShortDateString();
                _row.Controls.Add(cell2);
                //Cellule status
                HtmlTableCell cell3 = new HtmlTableCell();
                cell3.InnerText = StatusManager.getRessource((STATUS)fiche.STATUT);
                _row.Controls.Add(cell3);
                //cellule action
                HtmlTableCell cell4 = new HtmlTableCell();
                //Ajout du bouton
                HtmlButton _button = new HtmlButton();
                _button.Attributes.Add("class", "btn btn-default");
                _button.InnerText = Resource.BTN_ACCESS_CARD;
                    // HERE IS THE PROBLEM
                _button.ServerClick += _buttonAccess_ServerClick;
                //bind on button
                cell4.Controls.Add(_button);
                _row.Controls.Add(cell4);
                p_body.Controls.Add(_row);
            }
        }
    }

    private void _buttonAccess_ServerClick(object sender, EventArgs e)
    {

    }

dave000 · Accepted Answer · 2016-12-01 14:27:55Z

1

You can use basic inheritance with abstract functions. Simply create base page for these type of pages.

public abstract class TablePage : Page {
     protected void tableInit(HtmlGenericControl p_head, HtmlGenericControl p_body, delOnGetRecent p_delOnGetRecent) {
      ...
      _button.ServerClick += actionEventHandler;
      ...
      }
      ...

   protected abstract void actionEventHandler(object sender, EventArgs e);
}

public class _Default : TablePage { ... 

protected override void actionEventHander(object sender, EventArgs e) {}
...
}

Now you can put all the common stuff in the TablePage base class and put the TablePage.cs in AppCode or in a separate project.

answered Dec 1, 2016 at 14:27

dave000

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1 Comment

Grégory L Over a year ago

That's not what I was thinking about at all but that's also very interesting, thanks :) I will look at that :)

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