Convert nested foreach-loops with 3 levels to recurrence with n levels

问题

I want to convert the following code to handle more than 3 foreach-levels.

internal static void CreateLevel(LevelObject levelObject)
{
   foreach(LevelObject l1 in levelObject.LevelObjects)
   {
      foreach(LevelObject l2 in l1.LevelObjects)
      {
         foreach(LevelObject l3 in l2.LevelObjects)
         {
            AddEntities(l3);
         }
         AddEntities(l2);
      }
      AddEntities(l1);
   }
}

Every LevelObject has a collection of child-level-objects, a collection of entities and a parent-level-object. I need this to convert an object-structure to a filter. Anyone has an idea how to convert this?

回答1:

The easiest way is to recurse:

internal static void CreateLevel(LevelObject levelObject) {
    foreach (var l in levelObject.LevelObjects) {
        CreateLevel(l);
        AddEntities(l);
    }
}

回答2:

Using your code...

internal static void CreateLevel(LevelObject levelObject)
{
   foreach(LevelObject l1 in levelObject.LevelObjects)
   {
      CreateLevel(l1.LevelObjects);
      AddEntities(l1);
   }
}

Will accomplish the same goal

来源：https://stackoverflow.com/questions/12956034/convert-nested-foreach-loops-with-3-levels-to-recurrence-with-n-levels