c# - Changing ListView's selected item from code -
i'm constructing application using wpf , i'm having trouble figuring out how display new selection in listview that's selected via code.
i have listview bunch of items. want put button moves selected item next item in view. have able deselect item, move next item, , select selection appears user.
my xaml code follows:
<border grid.row="1" cornerradius="10" borderbrush="black" borderthickness="10"> <listview x:name="lvlogpackets" background="#ff0c3a58" foreground="white" selectionchanged="lvlogpackets_selectionchanged" selecteditem="{binding mode=twoway, updatesourcetrigger=propertychanged, path=isselected}"> <listview.contextmenu> <contextmenu name="lvcmenu" opened="menuopened_click"> <menuitem header="filter checked" ischeckable="true" checked="menuviewcheckbox_checked" unchecked="menuviewcheckbox_unchecked"/> <menuitem header="filter selected" ischeckable="true" checked="menuviewselected_checked" unchecked="menuviewselected_unchecked"/> <separator /> <menuitem header="Δt: n/a"/> <separator /> <menuitem header="pop out data" click="menupopout"/> <separator /> <menuitem header="copy payload csv" click="menucopypayloadcsv"/> </contextmenu> </listview.contextmenu> <listview.itemcontainerstyle> <style targettype="listviewitem"> <style.triggers> <trigger property="isselected" value="true"> <setter property="background" value="green"/> </trigger> <trigger property="ismouseover" value="true"> <setter property="background" value="red"/> </trigger> </style.triggers> </style> </listview.itemcontainerstyle> <listview.view> <gridview x:name="lvgridview"> <gridviewcolumn width="30"> <gridviewcolumn.celltemplate> <datatemplate> <checkbox ischecked="{binding path=ischecked, mode=twoway, updatesourcetrigger=propertychanged}" /> </datatemplate> </gridviewcolumn.celltemplate> </gridviewcolumn> <gridviewcolumn header="index" width="100" displaymemberbinding="{binding path=index}"/> <gridviewcolumn header="systime" width="100" displaymemberbinding="{binding path=systime}"/> <gridviewcolumn header="elapsedtime" width="150" displaymemberbinding="{binding path=elapsedtime}"/> <gridviewcolumn header="source" width="100" displaymemberbinding="{binding path=source}"/> <gridviewcolumn header="destination" width="100" displaymemberbinding="{binding path=destination}"/> <gridviewcolumn header="cmdid" width="100" displaymemberbinding="{binding path=cmdid}"/> <gridviewcolumn header="payloadsize" width="100" displaymemberbinding="{binding path=payloadsize}"/> <gridviewcolumn header="payload" width="800" displaymemberbinding="{binding path=payload}"/> </gridview> </listview.view> </listview> </border> my application code follows:
public class logitem : inotifypropertychanged { public string index { get; set; } public string systime { get; set; } public string elapsedtime { get; set; } public string source { get; set; } public string destination { get; set; } public string cmdid { get; set; } public string payloadsize { get; set; } public string payload { get; set; } public bool _isselected; public bool isselected { { return _isselected; } set { _isselected = value; notifypropertychanged("isselected"); } } private bool _ischecked; public bool ischecked { { return _ischecked; } set { _ischecked = value; notifypropertychanged("ischecked"); } } ... public event propertychangedeventhandler propertychanged; protected void notifypropertychanged(string strpropertyname) { if (propertychanged != null) propertychanged(this, new propertychangedeventargs(strpropertyname)); } } public partial class mainwindow : ribbonwindow { private observablecollection<logitem> m_logitems = new observablecollection<logitem>(); private void ribbonwindow_loaded(object sender, routedeventargs e) { lvlogpackets.itemssource = m_logitems; } } all other bindings appear work correctly, including ischecked binding. missing here? how link selecteditem/s data updates correctly?
edit: added mainwindow code requested wyatt earp.
they mean need bind object in on viewmodel so
public class sample_model { public sample_model(string artist, string song, string = "") { this.artist = artist; this.song = song; this.extra = extra; } public string artist { get; set; } public string song { get; set; } public string { get; set; } } public class sample_viewmodel : inotifypropertychanged { public sample_viewmodel() { this.datasource = createdata(); } // implement inotify public event propertychangedeventhandler propertychanged; private void notifypropertychanged(string propertyname) { propertychangedeventhandler handler = propertychanged; if (null != handler) { handler(this, new propertychangedeventargs(propertyname)); } } // create static list our demo private observablecollection<sample_model> createdata() { observablecollection<sample_model> my_list = new observablecollection<sample_model>(); my_list.add(new sample_model("faith + 1", "body of christ", "a track")); my_list.add(new sample_model("faith + 1", "christ again", "a track")); my_list.add(new sample_model("faith + 1", "a night lord", "a track")); my_list.add(new sample_model("faith + 1", "touch me jesus", "a track")); my_list.add(new sample_model("faith + 1", "i found jesus (with else)", "a track")); my_list.add(new sample_model("faith + 1", "savior self", "a track")); my_list.add(new sample_model("faith + 1", "christ day", "a track")); my_list.add(new sample_model("faith + 1", "three times savior", "a track")); my_list.add(new sample_model("faith + 1", "jesus touched me", "a track")); my_list.add(new sample_model("faith + 1", "lord savior", "a track")); my_list.add(new sample_model("faith + 1", "i wasn't born again yesterday", "a track")); my_list.add(new sample_model("faith + 1", "pleasing jesus", "a track")); my_list.add(new sample_model("faith + 1", "jesus (looks kinda hot)", "a track")); my_list.add(new sample_model("butters", "what what", "b track")); return my_list; } public observablecollection<sample_model> datasource { get; set; } sample_model _seleteditem; public sample_model selecteditem { { return _seleteditem; } set { _seleteditem = value; notifypropertychanged("selecteditem"); } } } <grid> <grid.columndefinitions> <columndefinition width="217*"/> <columndefinition width="300*"/> </grid.columndefinitions> <listview x:name="mylistview" width="200" selectionchanged="mylistview_selectionchanged" horizontalalignment="left" selecteditem="{binding selecteditem, mode=twoway, updatesourcetrigger=propertychanged}"> <listview.itemtemplate> <datatemplate> <stackpanel> <textblock text="{binding artist}"></textblock> <textblock text="{binding song}"></textblock> </stackpanel> </datatemplate> </listview.itemtemplate> </listview> <button x:name="mybutton" grid.column="1" content="change selected item" click="mybutton_click"></button> </grid> public partial class mainwindow : window { private sample_viewmodel viewmodel; public mainwindow() { initializecomponent(); } private void window_loaded(object sender, routedeventargs e) { sample_viewmodel viewmodel = new sample_viewmodel(); // create view model mylistview.datacontext = viewmodel; // set datacontext (this link commands) mylistview.itemssource = viewmodel.datasource; // set itemssource, link artist,songs } private void mylistview_selectionchanged(object sender, selectionchangedeventargs e) { } private void mybutton_click(object sender, routedeventargs e) { // testing purpose, don't use code mylistview.selecteditem = (sample_model) ((observablecollection<sample_model>)mylistview.itemssource)[2]; // or can // viewmodel.selecteditem = (sample_model)((observablecollection<sample_model>)mylistview.itemssource)[2]; // or // viewmodel.selecteditem = viewmodel.datasource[2]; mylistview.focus(); } } 
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