c# - Filtering items in a Listview -


i trying filter items in listview using textbox.
i've managed make something, can delete items listview, not bring them back. here little example of code: 

private void textbox1_textchanged(object sender, eventargs e) {     string value = textbox1.text.tolower();     (int = listview1.items.count - 1; -1 < i; i--)     {         if         (listview1.items[i].text.tolower().startswith(value) == false)         {             listview1.items[i].remove();         }     } }

does has idea on how retrieve deleted items? can't seem figure out >:...

check below sample app 

using system; using system.windows.forms; using system.collections.generic; using system.linq; public partial class form1 : form {     // keep list of listview items      list<data> items = new list<data>();      public form1()     {         initializecomponent();         // initial data         items = new list<data>(){             new data(){ id =1, name ="a"},             new data(){ id =2, name ="b"},             new data(){ id =3, name ="c"}         };          // adding initial data         listview1.items.addrange(items.select(c => new listviewitem(c.name)).toarray());     }      private void textbox1_textchanged(object sender, eventargs e)     {         listview1.items.clear(); // clear list items before adding          // filter items match search key , add result list view          listview1.items.addrange(items.where(i=>string.isnullorempty(textbox1.text)||i.name.startswith(textbox1.text))             .select(c => new listviewitem(c.name)).toarray());     }  }  class data {     public int id { get; set; }     public string name { get; set; } }

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