c# - How to create a control with ValidationGroup and a custom validation? -

i want make panels visibility true or false based on result of func.

i have page controls in following code:

<asp:panel id="panel2" runat="server">     <asp:panel id="panel3" runat="server">         <c:permissionpanel id="p1" runat="server" validationgroup="val1">             validation group 1 - ok         </c:permissionpanel>     </asp:panel> </asp:panel>  <c:permissionpanel id="p2" runat="server" validationgroup="val1">     validation group 1 - ok </c:permissionpanel>  <hr />  <c:permissionpanel id="p3" runat="server" validationgroup="val2">     validation group 2 - ok </c:permissionpanel>  <asp:panel id="panel4" runat="server">     <asp:panel id="panel1" runat="server">         <c:permissionpanel id="p4" runat="server" validationgroup="val2">             validation group 2 - ok         </c:permissionpanel>     </asp:panel> </asp:panel> 

in short have 4 permissionpanel can inside other controls.

the code of permissionpanel following:

public class permissionpanel : panel {     public delegate bool onvalidate();     public event onvalidate validate;      public string validationgroup { get; set; }      protected override void onprerender(eventargs e)     {         this.visible = (validate != null ? validate() : false);          base.onprerender(e);     } } 

i want permissionpanels page , add event on each accordingly group, example:

protected void page_load(object sender, eventargs e) {     // magic code here. linq welcome     // getpagecontrols<permissionpanel>("val1").addevent(() => return true);     // getpagecontrols<permissionpanel>("val2").addevent(() => return false); } 

the code above make panels validationgroup == val1 visible while val2 not rendered.

so questions are: how can achieve this? there better way of doing it?

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in short want add func validation method allowing panels shown or not. real example is:

// if post owner logged user, show controls edit , delete () => return (user != null && user.id == post.userid); 

there 2 ways i´m aware of: searching or self-registering. in searching you´ll every control in control hierarchy starting page, recursively , checking if permissionpanel.

the second way, self-registering you´ll update permissionpanel register in list inside page.items , register validation handler controls in list.

on permissionpanel can that:

protected override void createchildcontrols() {      base.createchildcontrols();       list <permissionpanel> panels;       if (page.items["permissionpanels"] == null)          page.items["permissionpanels"] = panels = new list <permissionpanel>();      else          panels = page.items["permissionpanels"] list <permissionpanel>;       panels.add(this); } 

and on page onprerender can iterate on page.items["permissionpanels"] , registering validation handlers according validation group.