Post a Comment On: mo.notono.us

I love the List<T> class in C#2.0+, but haven't really used it much beyond as a typed ArrayList.  It's normally plenty. But today I was building a dynamic CAML string and started doing a bunch of repetitive code like List clauses = new List(); string foo = GetFooClause(); if (!string.IsNullOrEmpty(foo)) clauses.Add(foo); string bar = GetBarClause(); if (!string.IsNullOrEmpty(bar)) clauses.Add(bar); //.. when I realized there was a much simpler way: List clauses = new List(); clauses.Add(GetFooClause()); clauses.Add(GetBarClause()); //... //remove all empty clauses clauses.RemoveAll(string.IsNullOrEmpty); The last line is the kicker - List.RemoveAll() takes a Predicate (i.e. a functor with a single parameter) - and String.IsNullOrEmpty() happens to be just the Predicate for the job.