c# - Xaml binding to attached property referencing another property -

re-worked per peter’s suggestion.

i have xceed datetimepicker. accepts datetime? value display , bind to.

i have special date – 1900-01-01 00:00:00

if pass date datetimepicker, treated if passed in null – ie, date not shown.

when retrieve value, if date hasn’t been set ie null, return same special date – 1900-01-01 00:00:00.

for other dates, whatever goes in goes out.

in code behind (pseudo code):

        datetime specialdate = new datetime(1900,1,1,0,0,0)         datetime testdate = new datetime(2016, 2, 8, 10, 0, 0);          datetimepicker dtp = new datetimepicker();           // setting value.         if (testdate != specialdate)             dtp.value = testdate;          // getting value         if (dtp.value == null)             return specialdate;         else             return (datetime)dtp.value; 

can achieve same kind of thing using xaml , binding ?

use simple converter convert , convertback values:

public class datetimetosentinaldateconverter : ivalueconverter {     public object convert(object value, type targettype, object parameter, system.globalization.cultureinfo culture)     {         if (system.convert.todatetime(value).equals(new datetime(1900, 1, 1, 0, 0, 0)))         {             return null;         }         else         {             return value;         }     }      public object convertback(object value, type targettype, object parameter, system.globalization.cultureinfo culture)     {         if (value == null)         {             return new datetime(1900, 1, 1, 0, 0, 0);         }         else         {             return value;         }     } } 

and in xaml binding be:

value="{binding path=date , converter={staticresource datetimetosentinaldateconverter}}"