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Asp.net dynamic management (add, delete, read) Controls

Source: Internet
Author: User
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Oh, you just need to talk about it.Code.

I. Page code

 

<% @ Page Language = "C #" autoeventwireup = "true" codefile = "test. aspx. cs" inherits = "test" %>

<! Doctype HTML public "-// W3C // dtd xhtml 1.0 transitional // en" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<HTML xmlns = "http://www.w3.org/1999/xhtml">
<Head id = "head1" runat = "server">
<Title> </title>
</Head>
<Body>
<Form ID = "form1" runat = "server">
<Div>
<Asp: button id = "button3" runat = "server" text = "assign value" onclick = "button3_click"/>
<Asp: button id = "button2" runat = "server" onclick = "button2_click" text = "value"/>
<Table width = "280px">
<Tr>
<TD>
<Asp: Panel id = "Panel1" runat = "server">
</ASP: Panel>
<Asp: Label id = "label1" runat = "server" text = "label"> </ASP: Label>
<Asp: button id = "button1" runat = "server" text = "add" onclick = "button#click"/>
</TD>
</Tr>
</Table>
</Div>
</Form>
</Body>
</Html>

 

 

Ii. Background code

 

Using system;
Using system. configuration;
Using system. Data;
Using system. Web;
Using system. Web. Security;
Using system. Web. UI;
Using system. Web. UI. htmlcontrols;
Using system. Web. UI. webcontrols;
Using system. Web. UI. webcontrols. webparts;

Public partial class test: system. Web. UI. Page
{
Protected void page_load (Object sender, eventargs E)
{
If (! Ispostback)
{
Viewstate ["num"] = 3;
}

Loadctrl (Int. parse (viewstate ["num"]. tostring ()));
}

/// <Summary>
/// Set the value
/// </Summary>
Private void settxtvalue ()
{
Viewstate ["num"] = 5;
Loadctrl (Int. parse (viewstate ["num"]. tostring ()));

For (INT I = 0; I <5; I ++)
{
Textbox TXT = panel1.findcontrol ("TXT" + I. tostring () as textbox;
TXT. Text = I. tostring ();
}
}

/// <Summary>
/// Load controls
/// </Summary>
/// <Param name = "num"> </param>
Private void loadctrl (INT num)
{
Panel1.controls. Clear ();

For (INT I = 0; I <num; I ++)
{
Textbox TXT = new Textbox ();
TXT. ID = "TXT" + I. tostring ();
TXT. Text = request. Form [TXT. clientid];

Linkbutton lbtn = new linkbutton ();
Lbtn. ID = "lbtn" + I. tostring ();
Lbtn. commandargument = I. tostring ();
Lbtn. Text = "delete ";
Lbtn. Click + = new eventhandler (btndel_click );

Literal LTL = new literal ();
LTL. ID = "LTL" + I. tostring ();
LTL. Text = "<br/> ";

panel1.controls. add (txt);
panel1.controls. add (lbtn);
panel1.controls. add (LTL);
}< BR >}

///


/// Delete
///
///
//
protected void btndel_click (Object sender, eventargs e)
{< br> linkbutton lbtn = sender as linkbutton;
string id = lbtn. commandargument;
textbox TXT = panel1.findcontrol ("TXT" + id. tostring () as textbox;
literal LTL = panel1.findcontrol ("LTL" + id. tostring () as literal;

Panel1.controls. Remove (txt );
Panel1.controls. Remove (lbtn );
Panel1.controls. Remove (LTL );
Viewstate ["num"] = int. parse (viewstate ["num"]. tostring ()-1;

Setcontrolsid ();
}

///


/// add
///
///
//
protected void button#click (Object sender, eventargs e)
{< br> viewstate ["num"] = int. parse (viewstate ["num"]. tostring () + 1;
loadctrl (Int. parse (viewstate ["num"]. tostring ();
}

/// <Summary>
/// Value
/// </Summary>
/// <Param name = "sender"> </param>
/// <Param name = "E"> </param>
Protected void button2_click (Object sender, eventargs E)
{
Label1.text = string. empty;

For (INT I = 0; I <(INT) viewstate ["num"]; I ++)
{
Label1.text + = (textbox) (panel1.findcontrol ("TXT" + I. tostring (). text;
}
}

/// <Summary>
/// Reset the Control ID
/// </Summary>
Private void setcontrolsid ()
{
Int I = 0;

Foreach (control CTL in panel1.controls)
{
If (CTL. GetType (). Name. tolower () = "textbox ")
{
CTL. ID = "TXT" + I. tostring ();
}
If (CTL. GetType (). Name. tolower () = "linkbutton ")
{
CTL. ID = "lbtn" + I. tostring ();
}
If (CTL. GetType (). Name. tolower () = "literal ")
{
CTL. ID = "LTL" + I. tostring ();

I ++;
}
}
}

/// <Summary>
/// Assign a value
/// </Summary>
/// <Param name = "sender"> </param>
/// <Param name = "E"> </param>
Protected void button3_click (Object sender, eventargs E)
{
Settxtvalue ();

}
}

 

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Related Keywords:
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