Http://www.cnblogs.com/lovecherry/archive/2005/03/25/125526.html
The last time I gave an example of a dynamic template column, a user asked me how to perform the update operation and paging. The following code is provided.
Front-end:
<% @ Page Language = "C #" codebehind = "webform30.aspx. cs" autoeventwireup = "false" inherits = "csdn. webform30" %>
<! Doctype HTML public "-// W3C // dtd html 4.0 transitional // en">
<HTML>
<Head>
<Title> webform30 </title>
<Meta name = "generator" content = "Microsoft Visual Studio. NET 7.1">
<Meta name = "code_language" content = "C #">
<Meta name = "vs_defaultclientscript" content = "JavaScript">
<Link href = "css.css" rel = "stylesheet" type = "text/CSS">
<Meta name = "vs_targetschema" content = "http://schemas.microsoft.com/intellisense/ie5">
</Head>
<Body ms_positioning = "gridlayout">
<Form ID = "form1" method = "Post" runat = "server">
<Asp: DataGrid id = "datagrid1" runat = "server"> </ASP: DataGrid>
</Form>
</Body>
</Html>
Background:
Using system;
Using system. collections;
Using system. componentmodel;
Using system. Data;
Using system. Data. sqlclient;
Using system. drawing;
Using system. Web;
Using system. Web. sessionstate;
Using system. Web. UI;
Using system. Web. UI. webcontrols;
Using system. Web. UI. htmlcontrols;
Namespace csdn
{
/// <Summary>
/// Summary of webform30.
/// </Summary>
Public class webform30: system. Web. UI. Page
{
Protected system. Web. UI. webcontrols. DataGrid datagrid1;
Private void page_load (Object sender, system. eventargs E)
{
// Place user code here to initialize the page
If (! Ispostback)
{
Bindgrid ();
}
Createdatagrid (); // you can set the DataGrid.
}
Protected void createdatagrid ()
{
Datagrid1.autogeneratecolumns = false; // disable auto-generated Columns
Datagrid1.cssclass = "border"; // border Style
Datagrid1.borderwidth = 0;
Datagrid1.cellspacing = 1;
Datagrid1.cellpadding = 5;
Datagrid1.itemstyle. cssclass = "item"; // normal Column Style
Datagrid1.headerstyle. cssclass = "Header"; // Header style
Datagrid1.pagerstyle. cssclass = "Header"; // footer Style
Datagrid1.datakeyfield = "stuid"; // primary key field
Datagrid1.allowpaging = true; // allow pagination
Datagrid1.pagesize = 5; // page size
Datagrid1.pagerstyle. mode = pagermode. numericpages; // digital Paging
Editcommandcolumn ECC = new editcommandcolumn (); // update the button Column
ECC. buttontype = buttoncolumntype. Pushbutton; // push button
ECC. edittext = "edit ";
ECC. canceltext = "cancel ";
ECC. updatetext = "Update"; // button text
Datagrid1.columns. Add (ECC); // Add a button Column
Maid + = new maid (maid editcommand );
Maid command + = new maid (maid updatecommand );
Maid command + = new maid (maid cancelcommand); // update, cancel, edit event registration
Datagrid1.pageindexchanged + = new system. Web. UI. webcontrols. datagridpagechangedeventhandler
Setbind (); // bind data
}
Protected void bindgrid ()
{
Templatecolumn TM = new templatecolumn ();
TM. itemtemplate = new columntemplate1 (); // common column
TM. edititemtemplate = new columntemplate2 (); // edit a column
TM. headertext = "name ";
Datagrid1.columns. addat (0, Tm); // Add the first template column to the first column.
Templatecolumn TM2 = new templatecolumn ();
Tm2.itemtemplate = new columntemplate3 ();
Tm2.edititemtemplate = new columntemplate4 ();
Tm2.headertext = "";
Datagrid1.columns. addat (1, TM2); // Add the first template column to the second column.
Datagrid1.itemdatabound + = new system. Web. UI. webcontrols. datagriditemeventhandler (datagrid1_itemdatabound); // register a Data Binding event. Pay attention to the location of Event code registration.
Setbind ();
}
Protected void setbind ()
{
Sqlconnection conn = new sqlconnection (system. configuration. configurationsettings. deleettings ["conn"]);
Sqldataadapter da = new sqldataadapter ("select * from Stu, DEP where Stu. studepid = dep. depid", Conn );
Dataset DS = new dataset ();
Da. Fill (DS, "Table1 ");
This. datagrid1.datasource = Ds. Tables ["Table1"];
This. datagrid1.databind ();
}
Private void maid (Object sender, system. Web. UI. webcontrols. datagriditemeventargs E)
{
Sqlconnection conn = new sqlconnection (system. configuration. configurationsettings. deleettings ["conn"]);
Sqldataadapter da = new sqldataadapter ("select * From Dep", Conn );
Dataset DS = new dataset ();
Da. Fill (DS, "Table1 ");
If (E. Item. itemtype = listitemtype. edititem)
{
Dropdownlist DDL = (dropdownlist) E. Item. findcontrol ("Dep ");
DDL. datasource = Ds. Tables ["Table1"];
DDL. datatextfield = "depname ";
DDL. datavaluefield = "depid ";
DDL. databind ();
DDL. Items. findbyvalue (convert. tostring (databinder. eval (E. Item. dataitem, "depid"). Selected = true;
}
}
Private void datagrid1_editcommand (Object source, system. Web. UI. webcontrols. datagridcommandeventargs E)
{
This. datagrid1.edititemindex = E. Item. itemindex;
Bindgrid ();
}
Private void datagrid1_cancelcommand (Object source, system. Web. UI. webcontrols. datagridcommandeventargs E)
{
This. Maid =-1;
Bindgrid ();
}
Private void datagrid1_updatecommand (Object source, system. Web. UI. webcontrols. datagridcommandeventargs E)
{
String uid = E. Item. uniqueid + ":"; // do not omit the colon
Sqlconnection conn = new sqlconnection (system. configuration. configurationsettings. deleettings ["conn"]);
Sqlcommand comm = new sqlcommand ("Update Stu set stuname = @ name, studepid = @ depid where stuid = @ ID", Conn );
Sqlparameter parm1 = new sqlparameter ("@ name", sqldbtype. nvarchar, 50 );
Parm1.value = request. Form [uid + "name"]. tostring ();
Sqlparameter parm2 = new sqlparameter ("@ depid", sqldbtype. INT );
Parm2.value = request. Form [uid + "Dep"]. tostring ();;
Sqlparameter parm3 = new sqlparameter ("@ ID", sqldbtype. INT );
Parm3.value = This. datagrid1.datakeys [E. Item. itemindex];
Comm. Parameters. Add (parm1 );
Comm. Parameters. Add (parm2 );
Comm. Parameters. Add (parm3 );
Conn. open ();
Comm. executenonquery ();
Conn. Close ();
This. Maid =-1;
Bindgrid ();
// The reason why the previous (textbox) E. Item. findcontrol ("name"). text cannot be used to retrieve data is that the DataGrid column is dynamically added and cannot be obtained.
}
Private void datagrid1_pageindexchanged (Object source, system. Web. UI. webcontrols. datagridpagechangedeventargs E)
{
This. datagrid1.currentpageindex = E. newpageindex;
Bindgrid ();
}
# Code generated by region web Form Designer
Override protected void oninit (eventargs E)
{
//
// Codegen: This call is required by the ASP. NET web form designer.
//
Initializecomponent ();
Base. oninit (E );
}
/// <Summary>
/// The designer supports the required methods-do not use the code editor to modify
/// Content of this method.
/// </Summary>
Private void initializecomponent ()
{
This. Load + = new system. eventhandler (this. page_load );
}
# Endregion
}
Public class columntemplate1: itemplate
{
Public void instantiatein (control container)
{
Literalcontrol L = new literalcontrol ();
L. databinding + = new eventhandler (this. ondatabinding );
Container. Controls. Add (L );
}
Public void ondatabinding (Object sender, eventargs E)
{
Literalcontrol L = (literalcontrol) sender;
Datagriditem Container = (datagriditem) L. namingcontainer;
L. Text = (datarowview) container. dataitem) ["stuname"]. tostring ();
}
}
Public class columntemplate2: itemplate
{
Public void instantiatein (control container)
{
Textbox T = new Textbox ();
T. width = 88;
T. ID = "name"; // you need to give an ID, which can be obtained at request. form.
T. databinding + = new eventhandler (this. ondatabinding );
Container. Controls. Add (t );
}
Public void ondatabinding (Object sender, eventargs E)
{
Textbox t = (textbox) sender;
Datagriditem Container = (datagriditem) T. namingcontainer;
T. Text = (datarowview) container. dataitem) ["stuname"]. tostring (); // bind the stuname Field
}
}
Public class columntemplate3: itemplate
{
Public void instantiatein (control container)
{
Literalcontrol L = new literalcontrol ();
L. databinding + = new eventhandler (this. ondatabinding );
Container. Controls. Add (L );
}
Public void ondatabinding (Object sender, eventargs E)
{
Literalcontrol L = (literalcontrol) sender;
Datagriditem Container = (datagriditem) L. namingcontainer;
L. Text = (datarowview) container. dataitem) ["depname"]. tostring ();
}
}
Public class columntemplate4: itemplate
{
Public void instantiatein (control container)
{
Dropdownlist DPL = new dropdownlist ();
DPL. ID = "Dep ";
Container. Controls. Add (DPL );
} // No data binding is performed for this drop-down box. This operation is performed in itemdatabound of datagrid1.
}
}
The code is relatively simple, and there are simple annotations in the code.
Supplement 2: (1) this time the DataGrid is generated during design, not during the last running, the latter will cause update disorder; (2) being simple, the template column Class in the Code is not well encapsulated. When using it, you should encapsulate the field and the template column type (listitemtype ).
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