I remember why I love C#.
After spending the last two years or so writing mainly Java code, getting back into Visual Studio felt a little awkward and painful.
Where did all my keyboard shortcuts go? Why can’t I navigate to members in a class? Oh, yes Resharper… ah that’s better.
But then it happened.
I was minding my own business writing some code… la la la
| public bool IsYummy() | |
| { | |
| if(!areOverridesLoaded) | |
| { | |
| LoadOverrides(); // loads the override from the database into this.theOverride | |
| } | |
| if(this.theOverride != null) | |
| { | |
| return theOverride.IsYummy.GetValueOrDefault(food.IsYummy); | |
| } | |
| return food.IsYummy; | |
| } | |
| public bool IsFruit() | |
| { | |
| if(!areOverridesLoaded) | |
| { | |
| LoadOverrides(); | |
| } | |
| if(this.theOverride != null) | |
| { | |
| return theOverride.IsFruit.GetValueOrDefault(food.IsFruit); | |
| } | |
| return food.IsFruit; | |
| } | |
| public bool IsVegetable() | |
| { | |
| if(!areOverridesLoaded) | |
| { | |
| LoadOverrides(); | |
| } | |
| if(this.theOverride != null) | |
| { | |
| return theOverride.IsVegetable.GetValueOrDefault(food.IsVegetable); | |
| } | |
| return food.IsVegetable; | |
| } |
Oh my, repeated code! What ever shall I do?
Hmm… It varies by property names only.
Surely I can refactor out the override loading code. Can’t put it in the constructor, because the goal is to lazy load the overrides from the database.
Func<> to the rescue!
This is the power of Func. Of delegates really. You can’t do this in Java folks… Hold on to your chair. Here we go…. Whee…..
| private bool ReturnValueOrDefault(Func<Food, bool?> FoodProperty, bool defaultValue) | |
| { | |
| if (!areOverridesLoaded) | |
| { | |
| LoadOverrides(); | |
| } | |
| if (this.theOverride != null) | |
| { | |
| return foodProperty(this.theOverride).GetValueOrDefault(defaultValue); | |
| } | |
| return defaultValue; | |
| } | |
| public bool IsYummy() | |
| { | |
| ReturnValueOrDefault(o => o.IsYummy, food.IsYummy); | |
| } | |
| public bool IsFruit() | |
| { | |
| ReturnValueOrDefault(o => o.IsFruit, food.IsFruit); | |
| } | |
| public bool IsVegetable() | |
| { | |
| ReturnValueOrDefault(o => o.IsVegetable, food.IsVegetable); | |
| } |
Good has won…
Evil has been defeated…
Code has been deleted…
Thank you Func<>
Don’t forget the Super Combo!
Also, check out the new page I created, a compilation of useful posts I have written about building software in an Agile way.