c# - Difference between DataView.Sort and DataTable.OrderBy().AsDataView()? -

-

i have datagridview bound datatable contains column of custom types need sort by. custom type (mycustomtype) implements icomparable<mycustomtype> how wanted sorting work.

i tried 2 methods create dataview use grid's data source:

mydatatable dt = new mydatatable(); dataview dv = new dataview(dt); dv.sort = "mycustomfield";

this did not work - "almost" worked, rows not sorted correctly.

second method:

mydatatable dt = new mydatatable(); dataview dv = dt.orderby(row => row.mycustomfield).asdataview();

this seems doing want. question is, what's difference between these 2 methods? possible dataview.sort not using icomparable<t> implementation, , linq-enabled dataview is? why case?

furthermore, know relative performance of non-linq-enabled , linq-enabled dataviews? seems if there isn't huge performance hit, there's no longer reason use non-linq-enabled version.

when call .sort on dataview, sorts particular instance of object. second method creates brand new object , assigns dv variable. can critical difference.

edit: not second method specifically, since you're not assigning, re-assigning. if had existing dataview, re-assigned using orderby method, you'd have scenario suggested.

sorry, wasn't clear should have been.


Comments

Post a Comment

Popular posts from this blog

ASP.NET/SQL find the element ID and update database -

-
basically i've got update query runs when click submit button. i have asp:repeater in page layer inside this <asp:repeater id="dgbookings" runat="server" onitemdatabound="itemdb"> <itemtemplate> <div class="bookingscontent"> <div class="bookingdetails" id="<%# databinder.eval(container.dataitem, "booking_ref") %>"> <p class="infotext"><%# databinder.eval(container.dataitem, "adults") %> <asp:linkbutton onclick="editdetails" text="edit..." runat="server"></asp:linkbutton></p> <p class="infotext"><asp:linkbutton onclick="submitdetails" text="submit..." runat="server"></asp:linkbutton></p> </div> </div> </itemtemplate> <asp:repeater> and outputs ...
Read more

jquery - appear modal windows bottom -

-
i have modal windows in application, work fine <div id="modal" class="modal hide fade" tabindex="-1" role="dialog" aria-labelledby="mymodallabel" aria-hidden="true"> but when modal appears, appear top of windows, , want appear bottom the application joomla 3.0! , using template of meet gavern any idea? i found solution i modified de css in bootstrap .modal.fade { top:-25%; -webkit-transition:opacity .3s linear, bottom .3s ease-out; -moz-transition:opacity .3s linear, bottom .3s ease-out; -ms-transition:opacity .3s linear, bottom .3s ease-out; -o-transition:opacity .3s linear, bottom .3s ease-out; transition:opacity .3s linear, bottom .3s ease-out; }
Read more

c++ - Compiling static TagLib 1.6.3 libraries for Windows -

-
i having super hard time compiling , using taglib 1.6.3 in qt project. i've tried can think of. taglib claims supported through cmake i'm not having luck. furthermore, i'm confused kinds of files need qt libs! i've built *.a files, *.lib, , *.dll. understand far... believe since i'm working in windows *.lib want. no matter do, end "undefined references" taglib functions try use when try compile qt project. have tried mingw32, msys, visual studio 2008, , cross-compiling windows on linux. turning nothing. what makes less sense me if compile same taglib source qt on mac (g++ think?) works fine! somewhere in windows compilation procedures have going wrong. have been smacking face on desk 30 (on , off) hours trying figure out. since qt uses mingw must compile taglib same compiler? if compile *.lib's visual studio not compatible? are *.a libraries usable in windows? (assuming mingw) i'm still trying handle on c++ stuff, after reading coun...
Read more