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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 ();

}
}

 

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
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