Performance issue: comparing to String.Format

Question

A while back a post by Jon Skeet planted the idea in my head of building a CompiledFormatter class, for using in a loop instead of String.Format().

Answer 1

It seems to me that in order to get actual performance improvement, you'd need to factor out any format analysis done by your customFormatter and formattable arguments into a function that returns some data structure that tells a later formatting call what to do. Then you pull those data structures in your constructor and store them for later use. Presumably this would involve extending ICustomFormatter and IFormattable. Seems kinda unlikely.