public fixed IChromosome To(this string message) return (IChromosome)Convert.ChangeType(message, typeof(T)); Tried (without fixed key phrase):

public IChromosome To(this string message) return (IChromosome)Convert.ChangeType(message, typeof(T));
If you get rid of "this" from your criteria it ought to work.public fixed IChromosome To (this string message)must be: public fixed IChromosome To(string message) alter public course LinqHelperto public fixed course LinqHelperFollowing factors require to

be taken into consideration when producing an expansion approach: The course which specifies an expansion technique should be non-generic, non-nestedevery and also fixed expansion approach have to be a fixed methodThe initial specification of the expansion approach need to utilize the this search phrase. I believe the wise use expansion approaches

placed user interfaces on an extra equatable placement with(abstract )base classes.Versioning. One benefit base courses have more than user interfaces is that you can quickly include brand-new online participants in a later variation, whereas including participants to a user interface will certainly damage implementers constructed versus the old variation of the collection. Rather, a brand-new variation of the user interface with the brand-new participants requires to be developed, as well as the collection will certainly need to function about or restrict accessibility to heritage items just carrying out the initial interface.As a concrete instance, the initial variation of a collection could specify a user interface thus: public user interface INode p>

INode Origin Checklist GetChildren(); As soon as the collection has actually launched

, we can not change the user interface without damaging existing individuals. Rather, in the following launch we would certainly require to specify a brand-new user interface to include added functionalty: public user interface IChildNode: INode Nonetheless, just individuals of the brand-new collection will certainly have the ability to execute the brand-new user interface. In order to deal with tradition code, we require to adjust the old application, which an expansion technique can deal with well: public fixed course NodeExtensions public INode GetParent (this INode node) Currently all customers of the brand-new collection can deal with both tradition and also contemporary executions identically.Overloads. One more location where expansion techniques can be valuable remains in offering overloads for user interface techniques. You may have an approach with numerous specifications to manage its activity, of which just the very first 1 or 2 are essential in the 90%situation.

Considering that C# does not permit establishing default worths for criteria, customers either need to call the totally parameterized technique each time, or every application should apply the minor overloads for the core method.Instead expansion approaches can be made use of to supply the minor overload executions: public user interface ILongMethod public bool LongMethod( string s, dual d, int i, object o, ...); ... public fixed LongMethodExtensions p>

d ) ... Please keep in mind that

both of these instances are composed in regards to the procedures given by the user interfaces, as well as entail popular or minor default executions. That claimed, you can just acquire from a course when, and also the targeted use expansion approaches can give a beneficial method to manage several of the details supplied by base courses that interfaces absence:) Edit: An associated message by Joe Duffy: Expansion techniques as default user interface technique executions