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The CTS specification states that a type can contain zero or more members . In Part II, Designing Types, I ll cover all of these members in great detail . For now, I want just to give you a brief introduction to them:

The number of refactorings that would be beneficial to any specific program is essentially infinite. Refactoring is subject to the same law of diminishing returns as other programming activities, and the 80/20 rule applies. Spend your time on the 20 percent of the refactorings that provide 80 percent of the benefit. Here are some ways you can decide which refactorings are most important.

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Field A data variable that is part of the object s state . Fields are identified by their name and type . Method A function that performs an operation on the object, often changing the object s state . Methods have a name, a signature, and modifiers . The signature specifies the number of parameters (and their sequence), the types of the parameters, whether a value is returned by the method, and if so, the type of the value returned by the method . Property To the caller, this member looks like a field . But to the type implementer, it looks like a method (or two) . Properties allow an implementer to validate input parameters and object state before accessing the value and/or calculating a value only when necessary . They also allow a user of the type to have simplified syntax . Finally, properties allow you to create read-only or write-only fields ." Event An event allows a notification mechanism between an object and other interested objects . For example, a button could offer an event that notifies other objects when the button is clicked .

Refactor when you add a routine When you add a routine, check whether related routines are well organized If not, refactor them Refactor when you add a class Adding a class often brings issues with existing code to the fore Use this time as an opportunity to refactor other classes that are closely related to the class you re adding Refactor when you fix a defect Use the understanding you gain from fixing a bug to improve other code that might be prone to similar defects Target error-prone modules Some modules are more error prone and brittle than others Is there a section of code that you and everyone else on your team is afraid of That s probably an error prone module.

The CTS also specifies the rules for type visibility and access to the members of a type . For example, marking a type as public (called public) exports the type, making it visible and accessible to any assembly . On the other hand, marking a type as assembly (called internal in C#) makes the type visible and accessible to code within the same assembly only . Thus, the CTS establishes the rules by which assemblies form a boundary of visibility for a type, and the CLR enforces the visibility rules . A type that is visible to a caller can further restrict the ability of the caller to access the type s members . The following list shows the valid options for controlling access to a member:

Although most people s natural tendency is to avoid these challenging sections of code, targeting these sections for refactoring can be one of the more effective strategies (Jones 2000) Target high complexity modules Another approach is to focus on modules that have the highest complexity ratings (See How to Measure Complexity in Section 196 for details on these metrics) One classic study found that program quality improved dramatically when maintenance programmers focused their improvement efforts on the modules that had the highest complexity (Henry and Kafura 1984) In a maintenance environment, improve the parts you touch Code that is never modified doesn t need to be refactored But when you do touch a section of code, be sure you leave it better than you found it.