Dynamically create repeater and bind data

There is a menu tree, because the interface restrictions (requirements) cannot use existing controls.

Then I thought of using the Repeater control to write it myself, so that the page can be controlled flexibly and conveniently.

 

< ASP: Repeater ID = "Categorylist" Runat = "Server" Onitemdatabound = "Categorylist_itemdatabound" >
< Headertemplate >
< Div Style = "Width: 90%; text-align: Left; padding-left: 10px ;" >
</ Headertemplate >
< Itemtemplate >
< Div Style = "Line-Height: 30px ;" >
< IMG SRC = "Images/jt_red.gif" Width = "3" Height = "5"   /> < IMG SRC = "Images/jt_red.gif"
Width = "3" Height = "5"   />
< ASP: hyperlink ID = "Hlrootcategory" Cssclass = "DH" Runat = "Server" > Category </ ASP: hyperlink >
</ Div >

</ Itemtemplate >
< Footertemplate >
</ Div >
</ Footertemplate >
</ ASP: Repeater >
The data source control is not used here. Data is dynamically bound in the background. Protected   Void Page_load ( Object Sender, eventargs E)
{
Dataset DS =   New Aricc. ooxx. BLL. Category (). getlist ( " Parentid = 0 " );
Categorylist. datasource = DS;
Categorylist. databind ();
}

Protected   Void Categorylist_itemdatabound ( Object Sender, repeateritemeventargs E)
{
Datarowview DRV = (Datarowview) E. Item. dataitem;
Hyperlink Link = (Hyperlink) E. Item. findcontrol ( " Hlrootcategory " );
If (Link ! =   Null )
{
Link. Text = DRV [ " Categoryname " ]. Tostring ();
Link. navigateurl =   " .../Search. aspx? C = "   + DRV [ " ID " ]. Tostring ();

Listinnercategory (E. Item, Int . Parse (DRV [ " ID " ]. Tostring ()));
}
}
Do you see the listinnercategory method? It is a method for recursively displaying subclass data. In this method, the repeater control is dynamically created and bound to the corresponding data. To dynamically create a repeater control, you must define a template. Used to assign values to the itemtemplate of repeater. This template must be an instance of a class that implements the itemplate interface. Next we will first define such a template class Public   Class Categorytemplate: itemplate
{

# region itemplate member
private int currentlevel;

Public categorytemplate ( int level)
{< br> currentlevel = level;
}< br> Public void instantiatein (control container)
{

Hyperlink Link= NewHyperlink ();
Link. ID= "Innerlink";

Htmlgenericcontrol Div =   New Htmlgenericcontrol ();
Div. tagname =   " Div " ;
Div. Attributes. Add ( " Style " , " Line-Height: 30px; text-indent: "   + (Currentlevel *   20 ) +   " Px; " );
Div. ID =   " Innerdiv " ;
Div. Controls. Add (Link );

Container. Controls. Add (DIV );
}

# Endregion
}
The following is the definition of listinnercategory and corresponding event processing. Program Private   Int Currentlevel =   0 ;
Private   Void Listinnercategory (repeateritem item, Int ID)
{
If ( New Aricc. ooxx. BLL. Category (). haschild (ID ))
{
Currentlevel ++ ;
Dataset DS =   New Aricc. ooxx. BLL. Category (). getlist ( " Parentid = "   + ID );
Repeater rep =   New Repeater ();
Categorytemplate Template =   New Categorytemplate (currentlevel );

rep. itemtemplate = template;
rep. itemdatabound += New repeateritemeventhandler (rep_itemdatabound );

Rep. datasource=DS;
Rep. databind ();
Item. Controls. Add (REP );
Currentlevel--;

}
}

Void Rep_itemdatabound ( Object Sender, repeateritemeventargs E)
{
Datarowview DRV = (Datarowview) E. Item. dataitem;
Hyperlink Link = (Hyperlink) E. Item. findcontrol ( " Innerlink " );
If (Link ! =   Null )
{
Link. Text = DRV [ " Categoryname " ]. Tostring ();
Link. navigateurl =   " .../Search. aspx? C = "   + DRV [ " ID " ]. Tostring ();

listinnercategory (E. item, int . parse (DRV [ " id " ]. tostring ();
}< BR >}< br> at this point, a multi-level tree menu is displayed. Maybe my application here is not a good solution. I wrote this Article to illustrate the dynamic creation of repeater. As mentioned in the question. Hope to help you.