c# - write generic method for paging -
i have controllers paging calculated. have 13 different controllers. write calculation in every controller tedious.
this comoplete method:
[route("sort/{sortcolumn}/{sortorder?}", name = "sort-product")] [route("page/{page:int}/{sortcolumn}/{sortorder?}", name = "paging-product")] [route("search/{searchstring}")] [route("index")] public actionresult index(string searchstring, string filter, string currentfilter, string sortcolumn, string sortorder, int? page) { iorderedqueryable<product> entities = (iorderedqueryable<product>)db.filteredproducts; if (searchstring != null) page = 1; else searchstring = currentfilter; if (filter != null) { string[] filters = filter.split(new char[] { '.' }); filter = ""; // filter on form if (filters.length > 0 && !string.isnullorempty(filters[0])) { formlibraryentry formentry = formlibrarycontroller.getformlibraryentry(filters[0], statehelper.getschema()); if (formentry != null) { entities = (iorderedqueryable<product>)entities.where( s => s.formname == formentry.id ); addfixednotification(string.format(resources.entity.environment.filteredbyformmessage, formentry.name)); filter += filters[0]; } } // filter on design template if (filters.length > 1 && !string.isnullorempty(filters[1])) { var designentry = designtemplatecontroller.gettemplatelibraryentry(filters[1], statehelper.getschema()); if (designentry != null) { entities = (iorderedqueryable<product>)entities.where( s => s.templatename == designentry.id ); addfixednotification(string.format(resources.entity.environment.filteredbydesigntemplatemessage, designentry.name)); filter += "." + filters[1]; } } } if (!string.isnullorempty(searchstring)) { entities = (iorderedqueryable<product>)entities.where( s => s.name.toupper().contains(searchstring.toupper()) || (!string.isnullorempty(s.formname) && s.formname.toupper().contains(searchstring.toupper())) || (!string.isnullorempty(s.urlname) && s.urlname.toupper().contains(searchstring.toupper())) ); addfixednotification(string.format(resources.entity.environment.filteredbysearchtermmessage, searchstring)); } switch (sortcolumn) { case "id": entities = (sortorder == "desc") ? entities.orderbydescending(s => s.id) : entities.orderby(s => s.id); break; case "name": entities = (sortorder == "desc") ? entities.orderbydescending(s => s.name) : entities.orderby(s => s.name); break; case "enabled": entities = (sortorder == "desc") ? entities.orderbydescending(s => s.isenabled) : entities.orderby(s => s.isenabled); break; case "formname": entities = (sortorder == "desc") ? entities.orderbydescending(s => s.formname) : entities.orderby(s => s.formname); break; case "design": entities = (sortorder == "desc") ? entities.orderbydescending(s => s.templatename) : entities.orderby(s => s.templatename); break; case "urlname": entities = (sortorder == "desc") ? entities.orderbydescending(s => s.urlname) : entities.orderby(s => s.urlname); break; case "forms": entities = (sortorder == "desc") ? entities.orderbydescending(s => s.submittedforms.count()) : entities.orderby(s => s.submittedforms.count()); break; case "modified": entities = (sortorder == "desc") ? entities.orderbydescending(s => s.modificationdate) : entities.orderby(s => s.modificationdate); break; default: sortcolumn = "name"; sortorder = ""; entities = (sortorder == "desc") ? entities.orderbydescending(s => s.name) : entities.orderby(s => s.name); break; } viewbag.sortcolumn = sortcolumn; viewbag.sortorder = sortorder == "desc" ? "desc" : ""; viewbag.searchstring = searchstring; viewbag.filter = filter; int pagesize = statehelper.getpagesize(); int pagenumber = statehelper.haspagesizechanged ? 1 : (page ?? 1); object selectionproduct = modelhelper.getselectedmodelid("product"); if (selectionproduct != null) { ienumerable<ienumerable<product>> pp = entities.partition(pagesize); int calculatedpage = 0; bool found = false; foreach (var item in pp) { calculatedpage++; ienumerable<product> inner = item ienumerable<product>; foreach (var product in inner) { if (product.id == (int)selectionproduct) { found = true; viewbag.selectedrowproduct = product.id; break; } } if (found) break; } if (found) pagenumber = calculatedpage; } return view(entities.topagedlist(pagenumber, pagesize)); } but part of calculation:
object selectionproduct = modelhelper.getselectedmodelid("product"); if (selectionproduct != null) { ienumerable<ienumerable<product>> pp = entities.partition(pagesize); int calculatedpage = 0; bool found = false; foreach (var item in pp) { calculatedpage++; ienumerable<product> inner = item ienumerable<product>; foreach (var product in inner) { if (product.id == (int)selectionproduct) { found = true; viewbag.selectedrowproduct = product.id; break; } } if (found) break; } if (found) pagenumber = calculatedpage; } so try build helper method this:
public static bool findpage(type t, object modelid, ienumerable<type> entities, int pagesize, int calculatedpage, int? id) { if (modelid != null) { calculatedpage = 0; ienumerable<ienumerable<t>> pp = entities.partition(pagesize); int page = 0; bool found = false; foreach (var item in pp) { page++; ienumerable<type> inner = item ienumerable<type>; foreach (var product in inner) { if (id == (int)modelid) { found = true; break; } } if (found) break; } if (found) calculatedpage = page; else calculatedpage = 0; return found; } return false; } but error:
the type or namespace name 't' not found (are missing using directive or assembly reference?) thank you
try:
public static bool findpage<t>(object modelid, ienumerable<t> entities, int pagesize, int calculatedpage, int? id) { if (modelid != null) { calculatedpage = 0; ienumerable<ienumerable<t>> pp = entities.partition(pagesize); int page = 0; bool found = false; foreach (var item in pp) { page++; ienumerable<t> inner = item ienumerable<t>; foreach (var product in inner) { if (id == (int)modelid) { found = true; break; } } if (found) break; } if (found) calculatedpage = page; else calculatedpage = 0; return found; } return false; }
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