vb.net - Need to bind/populate combobox in WPF forms, ideally with value and display -


my application other reasons isn't set mvvm architecture , i'm not able @ time. thing need modify combobox populated database (it stored in oracledatareader). programmatically add items combobox looping through oracledatareader, or bind in way.

public sub loadlocationcombo()     dim rs oracledatareader     dim dt new datatable()     dim dr datarow     dim lstitems new arraylist      rs = objclsdb.locationcombo      dt.load(rs)      dt.columns("description").allowdbnull = true     dt.columns("value_id").allowdbnull = true     dt.columns("description").defaultvalue = ""     dt.columns("value_id").defaultvalue = 0      dr = dt.newrow      dr("description") = ""     dr("value_id") = 0      dt.rows.insertat(dr, 0)      cbolocation.itemssource = dt.defaultview     cbolocation.displaymemberpath = "description"     cbolocation.selectedvaluepath = "value_id"  end sub

that current method, i'm trying add blank row @ top well. makes combo have looks multiple rows nothing in selected value , nothing displays.

edit: if remove cbolocation.displaymemberpath , .selectedvaluepath combobox filled bunch of system.data.common.datarecordinternal

first, defaultview of datatable return object of type dataview, , dataview not have properties called "description" or "value_id". that's why nothing selected, , nothing displayed.

you might build list , fill datatable values, example:

dim listtofillcombo new list(of keyvaluepair(of integer, string))  each dr datarow in dt.rows     listtofillcombo .add(new keyvaluepair(of integer, string)(cint(dr("value_id")), dr("description").tostring)) next

then combobox binding

cbolocation.itemssource = listtofillcombo  cbolocation.displaymemberpath = "value" cbolocation.selectedvaluepath = "key"

Comments

Post a Comment

Popular posts from this blog

jquery - How can I dynamically add a browser tab? -

since using iframes house external pages are, accounts "not preferred method" , disallowed sites (flickr, one), want dynamically generate browser tabs. e.g., when user submits form, want dynamically generate tab on browser in response submitted. e.g., might want add new tab url like: http://www.bigsurgarrapata.com/contact how in jquery? you want form target attribute action attribute. http://www.w3schools.com/tags/att_form_target.asp browsers have ultimate control on result of target attribute open new tab value of _blank. <form action="contact_submit.php" target="_blank" method="post">
Read more

node.js - Getting the socket id,user id pair of a logged in user(s) -

i have web application done using node js , in it,i have authentication system requires users log in before can access pages. have 2 pages,the homepage , updates page. from read docs,a new socket id issued when user opens tab in browser. me being admin,i know socket id of logged in user , more so,the socket id,logged in user id pair logged in users. what method can use socket id,logged in user id pair make sure broadcast realtime info users online?.
Read more

keyboard - C++ GetAsyncKeyState alternative -

i using windows.h library's getasynckeystate function define key pushed on keyboard . here program returns int value of pushed key example. #include <iostream> #include <windows.h> using namespace std; int main (){ char i; for(i=8;i<190;i++){ if(getasynckeystate(i)== -32767){ cout<<int (i)<<endl; } } return 0; } but trying make opengl simple game , function appeared slow . there function not need cycle 180 times , if statement . thanks you're trying make opengl game, you're going use glfw. if that's case can away using glfwgetkey() such: if (glfwgetkey(glfw_key_up) == glfw_press) {...} if (glfwgetkey(glfw_key_down) == glfw_press) {...} that method nicely explained in tutorial 6 opengl-tutorial.org . should start first tutorial of beginners tutorials , later intermediate tutorials . if you're going make win32 window can listen wm_keydown or wm_keyup messages , virtua
Read more