vb.net - TreeView Group by root -


i'm trying achive simple here. want treeview groups root item children show under common root.

in example below have 4 students , 3 coaches. 2 of students belong same coach. want 2 students 2 show under same root rather creating doing. can this?

current code:

    '//loads data      treeview2.nodes.clear()     dim connection oledbconnection = new oledbconnection("provider=microsoft.ace.oledb.12.0;data source=./academydatabase.accdb;persist security info=false;")     dim command oledbcommand = new oledbcommand("select distinct coach, fullname student order coach")     command.connection = connection     command.connection.open()       '//run command      dim datareader oledbdatareader = command.executereader()     '//run command      dim rows integer = 0       while datareader.read()         dim columns integer           treeview2.nodes.add(datareader(0).tostring())         columns = 1 datareader.fieldcount - 1             treeview2.nodes(rows).nodes.add(datareader.item(columns).tostring())         next           rows += 1     end while

current output:

enter image description here

try using dictionary keep reference of parent nodes using:

dim coaches new dictionary(of string, treenode) while datareader.read()   dim coachnode treenode = nothing   if coaches.containskey(datareader(0).tostring)     coachnode = coaches(datareader(0).tostring)   else     coachnode = new treenode(datareader(0).tostring)     coaches.add(datareader(0).tostring, coachnode)     treeview2.nodes.add(coachnode)   end if   coachnode.nodes.add(datareader(1).tostring) end while treeview2.expandall()

Comments

Post a Comment

Popular posts from this blog

android - Get AccessToken using signpost OAuth without opening a browser (Two legged Oauth) -

i using signpost oauth access data magento server. have read various tutorials on same , reach point open browser user can enter credentials. however, per requirement have automate part. hence, user should not browser page. have set-up done on server side ( magento ), hit url , returned call page. same through program in android. i have tried below, consumer = new commonshttpoauthconsumer(key, secret); provider = new commonshttpoauthprovider(oauth_init_url,access_token_url, authorize_url); try { provider.retrieverequesttoken(consumer, oauth.out_of_band); log.d("tokens" , consumer.gettoken() + " -- " + consumer.gettokensecret()); } and request tokens. dont know how bypass next step. tried directly accessing accesstoken (stupid of me) provider.retrieveaccesstoken(consumer, "mycallback://callback"); no luck, ends in oauth.signpost.exception.oauthnotauthorizedexception: authorization failed (server replied 401). ...
Read more

org.mockito.exceptions.misusing.InvalidUseOfMatchersException: mockito -

getting error org.mockito.exceptions.misusing.invaliduseofmatchersexception: invalid use of argument matchers! 1 matchers expected, 2 recorded. exception may occur if matchers combined raw values: //incorrect: somemethod(anyobject(), "raw string"); when using matchers, arguments have provided matchers. example: //correct: somemethod(anyobject(), eq("string matcher")); at when( getprogramservice .callservice(any(getprogramtype.class))) .thenreturn(jaxbresponse); please explain error , possible resolution the code posted looks fine; don't see problem it. code before or above causing exception. key here: invalid use of argument matchers! 1 matchers expected, 2 recorded. any , used above, doesn't return "special kind of null" or "special kind of getprogramtype"; don't exist. instead, returns null , side effect puts matcher on stack. whe...
Read more

google shop client API returns 400 bad request error while adding an item -

i'm working on solution add items in google shopping market java application. following tutorial real mess because of missing classes of laste release, after setting 1.5-beta maven managed make base example typecheck correctly classes. still can make simple task of adding 1 item. instead of posting whole code i'm posting part creates product feed. private product createproduct(string id) { product product = new product(); product.title = "red wool sweater"; product.content = new content( "text", "comfortable , soft, sweater keep warm on " + "cold winter nights. red , blue stripes."); product.appcontrol = new appcontrol(); product.appcontrol.addrequireddestination("productads"); product.externalid = id; product.lang = "it"; product.country = "it"; product.condition = "nuovo"; product.price = new price("eu...
Read more