c# - TreeView with CheckBoxes dynamically WPF. How to know the name of the elements selected -


i have code displays files , folders names in treeview , put checkbox each element. don't know how how know elements in treeview selected checkboxes.

xaml:

<treeview name="treeview" grid.row="10" grid.columnspan="3">         <treeview.resources>             <style targettype="{x:type treeviewitem}">                 <setter property="headertemplate">                     <setter.value>                         <datatemplate>                             <stackpanel orientation="horizontal">                                 <checkbox focusable="false" ischecked="false" verticalalignment="center"/>                                 <textblock text="{binding}" margin="5,0" />                             </stackpanel>                         </datatemplate>                     </setter.value>                 </setter>             </style>         </treeview.resources>     </treeview>

program:

    directoryinfo di = new directoryinfo(folder);     treeview.items.add(gettree(di));      public treeviewitem gettree(directoryinfo di)     {         treeviewitem item = new treeviewitem();         item.header = di.name;         item.fontweight = fontweights.normal;         foreach (directoryinfo s in di.getdirectories())         {             item.items.add(gettree(s));          }         foreach (fileinfo fi in di.getfiles())         {             item.items.add(fi.name);         }         return item;     }

create own treeviewitem type:

public class node {     public string name { get; set; }     public bool ischecked { get; set; }     public list<node> children { get; } = new list<node>(); }

add instance of type treeview:

public node gettree(directoryinfo di) {     node item = new node();     item.name = di.name;     foreach (directoryinfo s in di.getdirectories())     {         item.children.add(gettree(s));     }     foreach (fileinfo fi in di.getfiles())     {         item.children.add(new node { name = fi.name });     }     return item; }

bind properties of type in view:

<treeview name="treeview" grid.row="10" grid.columnspan="3">     <treeview.resources>         <hierarchicaldatatemplate datatype="{x:type local:node}" itemssource="{binding children}">             <stackpanel orientation="horizontal">                 <checkbox focusable="false" ischecked="{binding ischecked}" verticalalignment="center"/>                 <textblock text="{binding name}" margin="5,0" />             </stackpanel>         </hierarchicaldatatemplate>     </treeview.resources> </treeview>

you iterate through items recursively , check value of ischecked property:

private list<string> getselectednames() {     list<string> selectednames = new list<string>();     foreach (var item in treeview.items.oftype<node>())         getselected(item, ref selectednames);     return selectednames; }  public void getselected(node node, ref list<string> s) {     if (node.ischecked)         s.add(node.name);      foreach (node child in node.children)         getselected(child, ref s); }

if want take step further, bind itemssource property of treeview ienumerable<node> property of view model , iterate through 1 instead of items property of treeview control.


Comments

Post a Comment

Popular posts from this blog

Sort a complex associative array in PHP -

this question has answer here: php sort array subarray value 5 answers i have associative array in php like: $newarray1 = array ( [producta] => array ( [link] => http://sanjosespartan.com/blog/products/agile-java-development/ [visitcount] => 4 ) [productd] => array ( [link] => http://sanjosespartan.com/blog/products/intro-to-go/ [visitcount] => 1 ) [productg] => array ( [link] => http://sanjosespartan.com/blog/products/node-js-for-developers/ [visitcount] => 1 ) [productb] => array ( [link] => http://sanjosespartan.com/blog/products/beginning-mysql/ [visitcount] => 1 ) [productc] => array ( [link] => http://sanjosespartan.com/blog/products/computer-networks/ [visitcount] => 1 ) ...
Read more

vb.net - How to ignore if a cell is empty nothing -

how use roscolor() ignore value (like empty cell) ? color row if value upper 5 when there nothing in cell, want ignore roscolor() apply, how? public sub roscolor() integer = 0 quotedatagridview1.rows.count() - 1 step +1 dim val integer val = quotedatagridview1.rows(i).cells(3).value if val = vbempty quotedatagridview1.rows(i).defaultcellstyle.backcolor = color.white elseif val < 5 quotedatagridview1.rows(i).defaultcellstyle.backcolor = color.red elseif val > 5 , val < 10 quotedatagridview1.rows(i).defaultcellstyle.backcolor = color.lightyellow end if next end sub you can check empty value following public sub roscolor() integer = 0 quotedatagridview1.rows.count() - 1 step +1 dim val = quotedatagridview1.rows(i).cells(3).value if isdbnull(val) or val nothing quotedatagridview1.rows(i).defaultcellstyle.backcolor = color.white ...
Read more

recursion - Can every recursive algorithm be improved with dynamic programming? -

i first year undergraduate csc student looking competitive programming. recursion involves defining , solving sub problems. understand, top down dynamic programming (dp) involves memoizing solutions sub problems reduce time complexity of algorithm. can top down dp used improve efficiency of every recursive algorithm overlapping sub problems? dp fail work , how can identify this? the short answer is: yes. however, there constraints. obvious 1 recursive calls must overlap. i.e. during execution of algorithm, recursive function must called multiple times same parameters. lets truncate recursion tree memoization. can use memoization reduce number of calls. however, reduction of calls comes price. need store results somewhere. next obvious constraint need have enough memory. comes not-so obvious constraint. memory access requires time. first need find result stored , maybe copy location. in cases, might faster let recursion calculate result instead of loading somewher...
Read more