C# Interface, Unity, and Optional Parameter -


hopefully can shed light on one. have interface optional parameter. use unity. if try change optional parameter in method implementation, works directly, unity object uses interface's default - not implemented method's default.

setup:

public interface itestoptional   {      string happymethod(string input, bool amhappy = false); }  public class testingoptional : itestoptional   {      public string happymethod(string input, bool amhappy = true) {                 if (amhappy) return input + " happy!";                 return input + " not happy!";      } }

add unity:

container.registertype<itestoptional, testingoptional>();

and test:

//direct call var testdirect = new testingoptional(); string happydirect = testdirect.happymethod("cow", true);  //expecting happy - happy string saddirect = testdirect.happymethod("cow", false);   //expecting not happy - not happy string defaultdirect = testdirect.happymethod("cow"); //expecting happy (default) happy  //unity var testunity = servicelocator.current.getinstance<itestoptional>();  string happyunity = testunity.happymethod("cow", true);  //expecting happy - happy string sadunity = testunity.happymethod("cow", false);   //expecting not happy - not happy string defaultunity = testunity.happymethod("cow"); //expecting happy (default) not happy.

any ideas why unity object uses false optional parameter when implementation uses true?

servicelocator.current.getinstance<itestoptional>(); returns compile type itestoptional, call testunity.happymethod("cow"); converted compiler use default value specified in interface.

similarly new testingoptional(); returns compile time testingoptional , compiler pick default class.

possible solution (short of adjusting expectations/not using different defaults): can resolve type directly using unity instead of resolving interfce (sometimes useful tests):

  var directviacontainer = container.resolve<testingoptional>();

side note: re-defining default values in class implementing interface not god practice - you'll confusing code often.


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