What's the point of DSLs / fluent interfaces

Question

I was recently watching a webcast about how to create a fluent DSL and I have to admit, I don\'t understand the reasons why one would use such an approach (at least for the give

Answer 1

It's possible to use a variation on a Fluent interface to enforce certain combinations of optional parameters (e.g. require that at least one parameter from a group is present, and require that if a certain parameter is specified, some other parameter must be omitted). For example, one could provide a functionality similar to Enumerable.Range, but with a syntax like IntRange.From(5).Upto(19) or IntRange.From(5).LessThan(10).Stepby(2) or IntRange(3).Count(19).StepBy(17). Compile-time enforcement of overly-complex parameter requirements may require the definition of an annoying number of intermediate-value structures or classes, but the approach can in some cases prove useful in simpler cases.