wpf - Change DynamicResource from MVVM -

i trying bind dynamicresource value public property located in viewmodel , manipulate afterwards. static resource showing image. suggestions, thanks.

 <rectangle width="20" height="20">      <rectangle.fill>          <visualbrush stretch="fill" visual="{staticresource appbar_page_number1}" />      </rectangle.fill>  </rectangle> 

if have fixed number of resources , want convert lets enum resource can use binding converter. this:

public enum possiblevalue {     value1,     value2,     value3,     value4 } 

the converter like:

public class enumtovisualconverter : ivalueconverter {      public visual visual1 { get; set; }     public visual visual2 { get; set; }     public visual visual3 { get; set; }     public visual visual4 { get; set; }        public object convert(object value, type targettype, object parameter, system.globalization.cultureinfo culture)     {         if (!(value possiblevalue))             return null; //or default visual          possiblevalue val = (possiblevalue)value;          switch (val)         {             case possiblevalue.value1:                 return visual1;             case possiblevalue.value2:                 return visual2;             case possiblevalue.value3:                 return visual3;             default:                 return visual4;         }     }      public object convertback(object value, type targettype, object parameter, system.globalization.cultureinfo culture)     {         throw new notimplementedexception();     } } 

and declare converter in resources section :

<l:enumtovisualconverter x:key="myconverter"         visual1="{staticresource appbar_page_number1}"         visual2="{staticresource appbar_page_number2}"         visual3="{staticresource appbar_page_number3}"         visual4="{staticresource appbar_page_number4}"/> 

now link rectangle property in vm (let's call property mightyproperty).

<rectangle width="20" height="20">     <rectangle.fill>         <visualbrush stretch="fill" visual="{binding mightyproperty, converter={staticresource myconverter}}" />     </rectangle.fill> </rectangle> 

in way each time mightyproperty change in view model converter find appropriate visual , send visual property of visualbrush.

of course mightyproperty don't have of enum type can int string or other type. have adapt code inside convert method match type.