c# - How to bind datatable value in combobox which has static value? -

c# - How to bind datatable value in combobox which has static value? -

i have combobox few static values.

<combobox name="cmbboxfield" grid.column="4" grid.row="2" style="{staticresource comboboxstylefixedwidth}" itemssource="{binding}" ></combobox> mvvmmodle1.cmbboxfield.items.add(new customcomboboxitem("text box", "0")); mvvmmodle1.cmbboxfieldtype.items.add(new customcomboboxitem("pick list", "1")); mvvmmodle1.cmbboxfieldtype.items.add(new customcomboboxitem("check box", "2")); mvvmmodle1.cmbboxfieldtype.items.add(new customcomboboxitem("radio button", "3"));

when saving info in database table getting saved.

((customcomboboxitem)(mvvmmodle1.cmbboxfield.selectedvalue)).value.tostring();

now when trying edit form , binding value 1 time again combobox not showing value.

mvvmmodle1.cmbboxfield.selectedvalue = dtdatalist.rows[0]["controllist"].tostring().trim();

someone please help me in this. how bind selected value combobox?

there quite few problems code here:

you setting itemscontrol.itemssource property default binding (bind current info context), wrong unless datacontext type implements ienumerable, isn't. if right because datacontext is, example, observablecollection<t>, still have issue because adding items statically combobox instead of whatever itemssource is. also, type of items adding customcomboboxitem, i'm going assume inherits comboboxitem. either way, can't selectedvalue string since values in combobox not strings. you should not have collection of customcomboboxitem's, instead custom class in it's own viewmodel.

now that's been said, here suggested solution problem:

<combobox itemssource="{binding path=mycollection}" selectedvalue="{binding path=myselectedstring}" selectedvaluepath="stringprop" /> public class customcomboboxitem : comboboxitem { // not sure property name is... public string stringprop { get; set; } ... } // i'm assuming don't have separate viewmodel class , you're using // actual window/page viewmodel (which shouldn't do...) public class mywpfwindow : window, inotifypropertychanged { public mywpfwindow() { mycollection = new observablecollection<customcomboboxitem>(); // add together values somewhere in code, doesn't have here... mycollection.add(new customcomboboxitem("text box", "0")); etc ... initializecomponent(); } public observablecollection<customcomboboxitem> mycollection { get; private set; } private string _myselectedstring; public string myselectedstring { { homecoming _myselectedstring; } set { if (string.equals(value, _myselectedstring)) return; _myselectedstring = value; raisepropertychanged("myselectedstring"); } } public void getstringfromdb() { // ... myselectedstring = dtdatalist.rows[0]["controllist"].tostring().trim(); } }

you alternatively not implement inotifypropertychanged , utilize dependencyproperty myselectedstring property, using inpc preferred way. anyways, should give plenty info know direction head in...

tl;dr;

take advantage of binding observablecollection<t> (create property this). add items (customcomboboxitems) observablecollection<t>. bind itemssource new collection property created. bind selectedvalue string property create (take advantage of inpc). set selectedvaluepath path of string property name of customcomboboxitem.

c# wpf binding combobox