c# - Why isn't my background color binding updating? -

ok, sure have setup correctly...

i have grid, shown here:

<grid grid.row="1" grid.column="1" background="{binding crewselbg[1]}"> 

ok. have following array, here:

private string[] crewselbg; public string[] crewselbg {         {         return crewselbg;     }     set     {         crewselbg = value;         onpropertychanged("crewselbg");     } } 

i initialise values in array in constructor of viewmodel shown here:

crewselbg = new string[26]; crewselbg = enumerable.repeat("#8a008a00", 26).toarray(); 

this initialises entire array green colour. (in fact green colour should #00000000 wanted see bound correctly). have checkbox, when clicked activates icommand. here checkbox:

<checkbox grid.column="0" ischecked="{binding crewchecked[1]}" margin="5,0,0,0" command="{binding crewselectcheck}" commandparameter="01"/> 

and icommand calls setup here:

private icommand crewselectcheck;  public icommand crewselectcheck {         {         if (crewselectcheck == null)         {             crewselectcheck = new relaycommand(param => this.crewselectcheckex(param.tostring()), null);         }         return crewselectcheck;     } }  public void crewselectcheckex(string p) {     if (crewchecked[convert.toint32(p)])     {         crewselbg[convert.toint32(p)] = "aliceblue";//selected     }     else     {         crewselbg[convert.toint32(p)] = "#00000000";     } } 

ok... so... when clicking checkbox , moving checked state, triggers line setting crewselbg[1] aliceblue. put breakpoint on line , indeed trigger line. stepped 1 more line of code, , crewselbg[1] did indeed, change "aliceblue". background of grid stays green, (or whatever value put in constructor).

i dont understand why won't update??? have onpropertyraised event (i tried adding following well, didn't work:

onpropertychanged("crewselbg[1]"); 

that did nothing either.)

any ideas?

this observablecollection preferable. should able change string[] observablecollection<string> , have work correctly.

you can try onpropertychanged("crewselbg") if works invalidate of bindings elelements.