ASP网站制作之DataGrid罕见存眷成绩办理计划
在实现ERP等高端的ASP应用时，用户需要提供核心的经营资料，需要ASP商有很高的信用度。楼上说交互性不好，太牵强了吧。在微软提供的一套框架中，利用asp做网站，开发效率高，使用人数少，减少不必要的开销。交互性是互动方式，是有开发人员决定的。datagrid|办理|成绩IntroductionTheDataGridWebservercontrolisapowerfultoolfordisplayinginformationfromadatasource.Itiseasytouse;youcandisplayeditabledatainaprofessional-lookinggridbysettingonlyafewproperties.Atthesametime,thegridhasasophisticatedobjectmodelthatprovidesyouwithgreatflexibilityinhowyoudisplaythedata.
Thispaperaddressessomeofthequestionsaboutcustomizinggriddisplaythatarecommonlyaskedinnewsgroups,onWebsites,andinotherdeveloperforums.Thetechniquesdescribedherearesometimesquitesimpleandatothertimessomewhatinvolved.Ineachcase,however,theyaddressaquestionofhowtogobeyondthebasicfunctionalityoftheDataGridcontrol.
Thispaperassumesthatyouarealreadyfamiliarwiththecontrol―howtoaddittoaformandconfigureittodisplaydata.Youshouldalsounderstandhowtoputarowinthegridintoeditmodeandotherbasictasks.(Fordetails,seeDataGridWebServerControl.)Finally,youwillfindithelpfultoknowhowtoworkwithtemplates―addingtemplatecolumnstothegridandlayoutoutcontrolsinsideatemplate.
WindowsFormsversusWebFormsDataGridControl
TheWebFormsDataGridcontrolisnotthesameastheWindowsFormsequivalent.Itisacommon(andnotunreasonable)assumptionthattheyarethesamecontrol,oratleasthaveidenticalfunctionality.However,theentireprogrammingparadigmforWebFormsisquitedifferentfromthatforWindowsForms.Forexample,WebFormspagesperformaroundtriptotheserverforanyprocessing;theymustmanagestate;theyfeatureaverydifferentdata-bindingmodel;andsoon.
Becauseofthesedifferences,therearealsosignificantdifferencesintheirrespectivecontrols,includingtheDataGridcontrol.Asageneralrule,theWebFormsDataGridcontrolincludeslessbuilt-infunctionality.AfewexamplesofdifferencesintheWebFormsDataGridcontrolare:
Itdoesnotinherentlysupportmaster-detaildatastructures.
AswithotherWebservercontrols,itdoesnotsupporttwo-waydatabinding.Ifyouwanttoupdatedata,youmustwritecodetodothisyourself.
Youcanonlyeditonerowatatime.
Itdoesnotinherentlysupportsorting,althoughitraiseseventsyoucanhandleinordertosortthegridcontents.
Ontheotherhand:
YoucanbindtheWebFormsDataGridtoanyobjectthatsupportstheIEnumerableinterface.
TheWebFormsDataGridcontrolsupportspaging.
ItiseasytocustomizetheappearanceandlayoutoftheWebFormsDataGridcontrolascomparedtotheWindowsFormsone.(Detailsareprovidedlaterinthispaper.)
ControllingColumnWidth,Height,andAlignment
Bydefault,theDataGridcontrolsizesrowsandcolumnstofittheoverallheightandwidththatyouhaveassignedtothegrid.Withintheoverallgridwidth,itsizescolumnsaccordingtothewidthofthecolumnheadingtext.Alldataisdisplayedleft-justifiedbydefault.
Tocontrolcolumncharacteristics,youshouldturnoffautocolumngenerationbysettingtheAutoGenerateColumnspropertytofalse.Infact,youshouldsetthispropertytotrueonlyforshort-termuses,suchasquickproof-of-conceptpagesordemonstrations.Forproductionapplications,youshouldaddcolumnsexplicitly.Theindividualcolumnscanbeboundcolumnsortemplatecolumns.
Tosetthecolumnwidth,youcreateastyleelementforthatcolumnandthensettheelementsWidthpropertytostandardunits(say,pixels).ThefollowingexampleshowsyouwhattheHTMLsyntaxlookslikeforanItemStyleelementwithitsWidthpropertyset.
<asp:BoundColumnDataField="title"SortExpression="title"
HeaderText="Title">
<ItemStyleWidth="100px"></ItemStyle>
</asp:BoundColumn>
Alternatively,youcandothesamethingbysettingtheItemStylepropertydirectlyintheelement,asinthefollowingexample:
<asp:BoundColumnItemStyle-Width="100px"DataField="title"
SortExpression="title"HeaderText="Title">
</asp:BoundColumn>
Youcansetalignmentusingthestyleelement,settingitto"Right,""Left,"andothervaluesdefinedintheHorizontalAlignenumeration.(InVisualStudio,alignmentisavailableforindividualcolumnsintheFormattabofthegridsPropertybuilder.)Thefollowingisanexample:
<asp:BoundColumnDataField="title"SortExpression="title"
HeaderText="Title">
<ItemStyleWidth="100px"HorizontalAlign="Right"></ItemStyle>
</asp:Bound</p>下一页>>
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