Paging control source code -- Composite Control

Using system;
Using system. IO;
Using system. drawing;
Using system. Data;
Using system. Data. sqlclient;
Using system. Web. UI;
Using system. Web. UI. htmlcontrols;
Using system. Web. UI. webcontrols;
Using system. componentmodel;

Namespace Pager
{
/// <Summary>
/// Summary of coolpager.
/// </Summary>
Public Enum sorttype
{
ASC = 0, DESC = 1
};
Public Enum iscount
{
Noreturnrecordcount = 0, returnrecordcount
};
[Defaultproperty ("Copyright "),
Toolboxdata ("<{0}: coolpager runat = Server> </{0}: coolpager>")]
Public class coolpager: system. Web. UI. webcontrols. webcontrol, inamingcontainer
{
Protected int recordcount = 0;
Protected control _ controltopaginate;
Protected pageddatasource _ datasource;

[Bindable (true ),
Category ("appearance "),
Defaultvalue ("")]
Public String Copyright
{
Get
{
Return "All Rights Reserved: one bird in Qianshan ";
}
}
// Connection string
[Description ("data source connection string"), defaultvalue ("")]
Public String connectionstring
{
Get
{
Object OBJ = viewstate ["connectionstring"];
Return (OBJ = NULL )? String. Empty: obj. tostring ();
}
Set
{
Viewstate ["connectionstring"] = value;
}
}
// Controls that display pagination
[Description ("controls used to display pages"), defaultvalue ("")]
Public String controltopaginate
{
Get
{
Object OBJ = viewstate ["controltopaginate"];
Return (OBJ = NULL )? String. Empty: obj. tostring ();
}
Set
{
Viewstate ["controltopaginate"] = value;
}
}
// Table name
[Description ("query table name"), defaultvalue ("")]
Public String tablename
{
Get
{
Object OBJ = viewstate ["tablename"];
Return (OBJ = NULL )? String. Empty: obj. tostring ();
}
Set
{
Viewstate ["tablename"] = value;
}
}
// Sort Field Names
[Description ("sorting field"), defaultvalue ("")]
Public String fieldname
{
Get
{
Object OBJ = viewstate ["fieldname"];
Return (OBJ = NULL )? String. Empty: obj. tostring ();
}
Set
{
Viewstate ["fieldname"] = value;
}
}
// Number of records displayed per page
[Description ("number of records per page"), defaultvalue ("")]
Public int pagesize
{
Get
{
Object OBJ = viewstate ["pagesize"];
Return (OBJ = NULL )? 15: Convert. toint32 (OBJ );
}
Set
{
Viewstate ["pagesize"] = value;
}
}
// Page number
[Description ("Current page number"), defaultvalue ("")]
Public int pageindex
{
Get
{
Object OBJ = viewstate ["pageindex"];
Return (OBJ = NULL )? 1: Convert. toint32 (OBJ );
}
Set
{
Viewstate ["pageindex"] = value;
}
}
// Whether to return the total number of records
[Description ("whether to return the total number of records"), defaultvalue ("")]
Public iscount
{
Get
{
Return iscount. returnrecordcount;
}
}
// Sorting type
[Description ("sorting type"), defaultvalue ("")]
Public sorttype
{
Get
{
Object OBJ = viewstate ["sorttype"];
Return (OBJ = NULL )? Sorttype. ASC: (sorttype) OBJ;
}
Set
{
Viewstate ["sorttype"] = value;
}
}
// Where clause
[Description ("WHERE clause, without where"), defaultvalue ("")]
Public String where
{
Get
{
Object OBJ = viewstate ["where"];
Return (OBJ = NULL )? String. Empty: obj. tostring ();
}
Set
{
Viewstate ["where"] = value;
}
}
[Description ("Number of displayed navigation numbers"), defaultvalue ("")]
Public int showpagenumber
{
Get
{
Object OBJ = viewstate ["showpagenumber"];
Return (OBJ = NULL )? 10: Convert. toint32 (OBJ );
}
Set
{
Viewstate ["showpagenumber"] = value;
}
}
[Description ("start page"), defaultvalue ("")]
Public int pagestart
{
Get
{
Object OBJ = viewstate ["pagestart"];
Return (OBJ = NULL )? 1: Convert. toint32 (OBJ );
}
Set
{
Viewstate ["pagestart"] = value;
}
}
[Description ("total page number, automatically generated"), defaultvalue ("")]
Public int pagecount
{
Get
{
Object OBJ = viewstate ["pagecount"];
Return (OBJ = NULL )? 1: Convert. toint32 (OBJ );
}
Set
{
Viewstate ["pagecount"] = value;
}
}

/// <Summary>
/// Present the control to the specified output parameter.
/// </Summary>
/// <Param name = "output"> HTML writer to be written </param>
Protected override void render (htmltextwriter output)
{
If (page. enableviewstate = false)
Page. enableviewstate = true;
If (site! = NULL & site. designMode)
If (! Page. ispostback)
Createchildcontrols ();
Base. Render (output );
}
Public override void databind ()
{
Base. databind ();

Childcontrolscreated = false;

If (controltopaginate = "")
Return;
_ Controltopaginate = page. findcontrol (controltopaginate );
If (_ controltopaginate = NULL)
Return;
If (! (_ Controltopaginate is basedatalist | _ controltopaginate is listcontrol ))
Return;

If (connectionstring = "" | tablename = "")
Return;

// Fetch data
Fetchdata ();

// Bind data to the buddy Control
Basedatalist basedatalistcontrol = NULL;
Listcontrol = NULL;
If (_ controltopaginate is basedatalist)
{
Basedatalistcontrol = (basedatalist) _ controltopaginate;
Basedatalistcontrol. datasource = _ datasource;
Basedatalistcontrol. databind ();
Return;
}
If (_ controltopaginate is listcontrol)
{
Listcontrol = (listcontrol) _ controltopaginate;
Listcontrol. Items. Clear ();
Listcontrol. datasource = _ datasource;
Listcontrol. databind ();
Return;
}
}
Private void fetchdata ()
{
Sqlconnection Cn = new sqlconnection (connectionstring );
Sqlcommand CM = new sqlcommand ();
Cm. Connection = cn;
Cm. Connection. open ();

Cm. commandtext = "getrecordfrompage ";
Cm. commandtype = commandtype. storedprocedure;
Cm. Parameters. Add ("@ tblname", sqldbtype. nvarchar, 255 );
Cm. Parameters. Add ("@ fldname", sqldbtype. nvarchar, 255 );
Cm. Parameters. Add ("@ pagesize", sqldbtype. INT );
Cm. Parameters. Add ("@ pageindex", sqldbtype. INT );
Cm. Parameters. Add ("@ iscount", sqldbtype. Bit );
Cm. Parameters. Add ("@ ordertype", sqldbtype. Bit );
Cm. Parameters. Add ("@ strwhere", sqldbtype. nvarchar, 1000 );
Cm. Parameters ["@ tblname"]. value = tablename;
Cm. Parameters ["@ fldname"]. value = fieldname;
Cm. Parameters ["@ pagesize"]. value = pagesize;
Cm. Parameters ["@ pageindex"]. value = pageindex;
Cm. Parameters ["@ iscount"]. value = 0;
Cm. Parameters ["@ ordertype"]. value = sorttype;
Cm. Parameters ["@ strwhere"]. value = where;

Sqldataadapter adapter = new sqldataadapter (CM );
Datatable dtb = new datatable ();
Adapter. Fill (dtb );

Cm. Parameters ["@ iscount"]. value = iscount;
Recordcount = (INT) cm. executescalar ();
Pagecount = (INT) math. Ceiling (double) recordcount/pagesize );

Cm. Connection. Close ();
Cm. Dispose ();
CN. Dispose ();
Adapter. Dispose ();

// Configures the paged data source component
If (_ datasource = NULL)
_ Datasource = new pageddatasource ();
_ Datasource. allowcustompaging = true;
_ Datasource. allowpaging = true;
_ Datasource. currentpageindex = 0;
If (pageindex = pagecount)
{
_ Datasource. pagesize = (recordcount-(pageindex-1) * pagesize );
}
Else
{
_ Datasource. pagesize = pagesize;
}
If (pageindex = pagecount)
{
_ Datasource. virtualcount = (recordcount-(pageindex-1) * pagesize );
}
Else
{
_ Datasource. virtualcount = pagesize;
}
_ Datasource. datasource = dtb. defaultview;
}
Protected override void createchildcontrols ()
{
Controls. Clear ();
If (! Page. ispostback)
{
Clearchildviewstate ();
}

//************************************** *********
Table = new table ();
Table. width = unit. percentage (100 );
Table. cellpadding = 0;
Table. cellspacing = 3;
Table. borderwidth = 0;
Table. Font. size = fontunit. Point (9 );

Tablerow TR = new tablerow ();

Tablecell tdinfo = new tablecell ();
Tdinfo. width = unit. percentage (25 );
Tdinfo. horizontalalign = horizontalalign. Left;
Buildinfo (tdinfo );
Tr. cells. Add (tdinfo );

Tablecell tdnavigate = new tablecell ();
Tdnavigate. width = unit. percentage (50 );
Tdnavigate. horizontalalign = horizontalalign. Center;
Buildnavigator (tdnavigate );
Tr. cells. Add (tdnavigate );

Tablecell tdgoto = new tablecell ();
Tdgoto. width = unit. percentage (25 );
Tdgoto. horizontalalign = horizontalalign. Right;
Buildgoto (tdgoto );
Tr. cells. Add (tdgoto );

Table. Rows. Add (TR );
Controls. Add (table );
}
Private void buildinfo (tablecell TD)
{
Literalcontrol lc = new literalcontrol ();
LC. TEXT = "page number:" + pageindex. tostring () + "|" + pagecount. tostring () + "record:" + (pageindex-1) * pagesize + 1) + "-" + (recordcount <pagesize )? Recordcount: (pageindex = pagecount )? Recordcount: pageindex * pagesize) + "|" + recordcount;
TD. Controls. Add (LC );
}
Private void buildnavigator (tablecell TD)
{
Int temp;
If (pageindex> showpagenumber)
{
Linkbutton lbback = new linkbutton ();
Lbback. causesvalidation = false;
Lbback. Text = "...";
Lbback. commandargument = "back ";
Lbback. Command + = new commandeventhandler (lb_click );
TD. Controls. Add (lbback );
TD. Controls. Add (New literalcontrol ("& nbsp ;"));
}
//*************************
For (INT I = 0; I <showpagenumber; I ++)
{
If (pagestart + I) <= pagecount)
{
Temp = pagestart + I;
Linkbutton lbnumber = new linkbutton ();
Lbnumber. causesvalidation = false;
Lbnumber. Text = temp. tostring ();
Lbnumber. commandargument = temp. tostring ();
Lbnumber. Command + = new commandeventhandler (lbnumber_click );
TD. Controls. Add (lbnumber );
TD. Controls. Add (New literalcontrol ("& nbsp ;"));
}
}
If (pagecount-pagestart)> showpagenumber)
{
Linkbutton lbforward = new linkbutton ();
Lbforward. causesvalidation = false;
Lbforward. Text = "...";
Lbforward. commandargument = "Forward ";
Lbforward. Command + = new commandeventhandler (lb_click );
TD. Controls. Add (lbforward );
}
}
Private void buildgoto (tablecell TD)
{
Textbox TB = new Textbox ();
TB. ID = "gotopage ";
TB. borderwidth = unit. pixel (1 );
TB. width = unit. pixel (30 );
TB. enableviewstate = true;
TD. Controls. Add (TB );

Literalcontrol lc = new literalcontrol ("& nbsp ;");
TD. Controls. Add (LC );

Button BTN = new button ();
BTN. Text = "Goto ";
BTN. commandargument = Tb. clientid;
BTN. Command + = new commandeventhandler (lb_click );
TD. Controls. Add (BTN );

Requiredfieldvalidator val2 = new requiredfieldvalidator ();
Val2.controltovalidate = "gotopage ";
Val2.errormessage = "the page number cannot be blank! ";
Val2.display = validatordisplay. None;
Val2.id = "val2 ";
TD. Controls. Add (val2 );

Rangevalidator val1 = new rangevalidator ();
Val1.display = validatordisplay. None;
Val1.errormessage = "invalid page number! ";
Val1.id = "val1 ";
Val1.controltovalidate = "gotopage ";
Val1.type = validationdatatype. Integer;
Val1.minimumvalue = "1 ";
If (pagecount <1)
{
Val1.maximumvalue = "1 ";
}
Else
{
Val1.maximumvalue = pagecount. tostring ();
}

TD. Controls. Add (val1 );

Validationsummary valall = new validationsummary ();
Valall. showmessagebox = true;
Valall. showsummary = false;
TD. Controls. Add (valall );
}
Private void lb_click (Object sender, commandeventargs E)
{
Switch (E. commandargument. tostring ())
{
Case "back ":
Pagestart-= showpagenumber;
Pageindex = pagestart;
Createchildcontrols ();
Break;
Case "Forward ":
Pagestart + = showpagenumber;
Pageindex = pagestart;
Createchildcontrols ();
Break;
Default:
// Textbox TB = (textbox) parent. findcontrol ("coolpager1: gotopage ");
// Pageindex = convert. toint32 (Tb. Text );
String temp = page. Request. Form [This. clientid + ": gotopage"]. tostring (). Trim ();
Try
{
Pageindex = convert. toint32 (temp );
If (pageindex % showpagenumber = 0)
{
Pagestart = pageindex + 1-showpagenumber;
}
Else
{
Pagestart = (INT) math. Floor (double) pageindex/showpagenumber) * showpagenumber + 1;
}
Createchildcontrols ();
}
Catch
{
}
Break;
}
Databind ();
}
Private void lbnumber_click (Object sender, commandeventargs E)
{
Pageindex = convert. toint32 (E. commandargument );
Databind ();
}
}
}