c# - Breaking out of a recursive loop to check a condition, is this possible? -

i have situation need use same recursive loop check different conditions before looping around.

here recursive method;

private static categoryfeaturetype getparentcategorytype(         dms.productlocation productlocation, dms.productlocation[] productlocations,          dictionary<string, categoryfeaturetype> categoryfeaturetypes,          int level) {     categoryfeaturetype categoryfeaturetype = null;      categoryfeaturetypes             .trygetvalue(productlocation.externalchannelcode,                           out categoryfeaturetype);      // here want return object perform conditional check     // , come method if needed.     return categoryfeaturetype;      if (conditiontypecollection == null &&          productlocation.productlocationidforparent.hasvalue)     {         dms.productlocation parentlocation = productlocations             .firstordefault(p =>                  p.id == productlocation.productlocationidforparent);          if (parentlocation != null)         {             conditiontypecollection = getparentcategorytypecollection(                                           parentlocation,                                            productlocations,                                            categoryfeaturetypes,                                            level + 1);         }     } } 

normally, i'd have conditional check inside of method needs used in different situations use different conditional checks.

i use create method each conditional check i'd rather not this.

if possible in c# or going incorrect way?

you have callers pass in delegate returns bool (say, predicate<categoryfeaturetype>). getparentcategorytype method invoke delegate , use returned true or false value dictate if break. when recursing, can pass same delegate through:

private static categoryfeaturetype getparentcategorytype(     dms.productlocation productlocation,      dms.productlocation[] productlocations,      dictionary<string, categoryfeaturetype> categoryfeaturetypes,      int level,      predicate<categoryfeaturetype> shouldbreak) {    categoryfeaturetype categoryfeaturetype = null;     categoryfeaturetypes.trygetvalue(productlocation.externalchannelcode, out categoryfeaturetype);     if (shouldbreak(categoryfeaturetype))            return categoryfeaturetype;     if (conditiontypecollection == null && productlocation.productlocationidforparent.hasvalue)    {        dms.productlocation parentlocation = productlocations.firstordefault(p => p.id == productlocation.productlocationidforparent);        if (parentlocation != null)        {            conditiontypecollection = getparentcategorytypecollection(             parentlocation,              productlocations,              categoryfeaturetypes,              level + 1,              shouldbreak);        }    } } 

then can wrap method ones pass in predefined delegate:

private static categoryfeaturetype getparentcategorytypewheretypeisawesome(     dms.productlocation productlocation,      dms.productlocation[] productlocations,      dictionary<string, categoryfeaturetype> categoryfeaturetypes,      int level) {     predicate<categoryfeaturetype> returncheck = categoryfeaturetype =>     {         return categoryfeaturetype.coolness == "awesome";     };      return getparentcategorytype(         productlocation,          productlocations,          categoryfeaturetypes,          level,          returncheck); } 

if wanted execute without conditional check, check null delegate or can pass in delegate returns false:

if (shouldbreak != null && shouldbreak(categoryfeaturetype))        return categoryfeaturetype; 

or empty wrapper:

private static categoryfeaturetype getparentcategorytypeneverexit(     dms.productlocation productlocation,      dms.productlocation[] productlocations,      dictionary<string, categoryfeaturetype> categoryfeaturetypes,      int level) {     predicate<categoryfeaturetype> returncheck = categoryfeaturetype =>     {         return false;     };      return getparentcategorytype(         productlocation,          productlocations,          categoryfeaturetypes,          level,          returncheck); }