c# - Change backcolor of textboxes when their bound properties change? -

what best way of accomplishing this?

some sample code:

adding binding text boxes, , adding event listener:

this.myobject = new myobject();  this.mytextbox.databindings.add(     new binding("text", this.myobject, "myproperty", true,         datasourceupdatemode.onpropertychanged));  this.myothertextbox.databindings.add(     new binding("text", this.myobject, "myotherproperty", true,         datasourceupdatemode.onpropertychanged));  this.myobject.propertychanged += handler; 

the propertychangedeventhandler handler passed in parent user control, new propertychangedeventhandler(handlepropertychange). because parent contains save button enabled/disabled, , tab control has multiple pages containing multiple user controls. want handle property changes children, seemed best way of structuring things (??)

this object/property bind (based on https://stackoverflow.com/a/1316566/1061602)

public class myobject : inotifypropertychanged {     private int myproperty;     public int myproperty     {       { return myproperty; }       set { setfield(ref myproperty, value, () => myproperty); }     }      private int myotherproperty;     public int myotherproperty     {       { return myotherproperty; }       set { setfield(ref myotherproperty, value, () => myotherproperty); }     }      public event propertychangedeventhandler propertychanged;      protected virtual void onpropertychanged<t>(expression<func<t>> selectorexpression)     {       if (selectorexpression == null) throw new argumentnullexception("selectorexpression");       var body = selectorexpression.body memberexpression;       if (body == null) throw new argumentexception("the body must member expression");       onpropertychanged(body.member.name);     }      protected virtual void onpropertychanged(string propertyname)     {       propertychangedeventhandler handler = propertychanged;       if (handler != null) handler(this, new propertychangedeventargs(propertyname));     }      protected bool setfield<t>(ref t field, t value, expression<func<t>> selectorexpression)     {       if (equalitycomparer<t>.default.equals(field, value)) return false;        field = value;       onpropertychanged(selectorexpression);       return true;     } } 

i know there parameter called formattingenabled on binding object, looks date/time/currency formatting.

i can't see way of getting textbox propertychangedevent, referring property itself.

i saw this: binding bool property backcolor property of winform - i'm not sure if adding properties best approach?

update

based on bond's answer, this:

this.myobject.propertychanged += (s, e) => handler(this.controls, e); 

so passing in entire controlcollection on user control event hander.

and have event handler this:

public void configchanged(object sender, eventargs e) {   if (sender controlcollection)   {     var allcontrols = (controlcollection)sender;     foreach (var control in allcontrols)     {       if (control textbox)       {         var textbox = (textbox)control;         if (textbox.databindings[0].bindingmemberinfo.bindingfield ==              (e propertychangedeventargs).propertyname)         {           textbox.backcolor = color.lightgoldenrodyellow;         }       }     }   }   this.savebutton.enabled = true; } 

but seems unwieldy, , if form changed (e.g. putting textboxes groupbox, or wanting same other control types) no longer work.

i guess on user control side, know controls want bind to, create collection of , pass in sender object, still not particularly nice i'd have maintain list separately...

any thoughts?

you can this

this.myobject.propertychanged += (s, e) => handler(mytextbox, e);