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I already have to read the code; why should I have to read a lot of comments too Wait a minute, Ismene said, putting down her coffee mug to put in her two drachmas worth I know that commenting can be abused, but good comments are worth their weight in gold I ve had to maintain code that had comments and code that didn t, and I d rather maintain code with comments I don t think we should have a standard that says use one comment for every x lines of code, but we should encourage everyone to comment If comments are a waste of time, why does anyone use them, Callicles Socrates asked Either because they re required to or because they read somewhere that they re useful No one who s thought about it could ever decide they re useful Ismene thinks they re useful.

as after release), it isn t advisable to use externals. Let s say you re ready to deliver the software to the end user. You must tag both the client project and the referenced project. The same thing applies to branching: if you branch one project, the external reference stays unchanged, and you must branch and re-reference it manually. After the project is released, you may want to switch to referencing compiled libraries. It will be much easier to manage the files in a lib directory than to use external references. The external definitions are also read by the CI servers. If you use them, you can be sure that the CI server will be able to read and resolve the externals without any problem.

public interface IDisposable { void Dispose(); }

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She s been here three years, maintaining your code without comments and other code with comments, and she prefers the code with comments What do you make of that Comments are useless because they just repeat the code in a more verbose.

Any type that implements this interface is stating that it adheres to the dispose pattern . Simply put, this means that the type offers a public, parameterless Dispose method that can be explicitly called to release the resource wrapped by the object . Note that the memory for the object itself is not freed from the managed heap s memory; the garbage collector is still responsible for freeing the object s memory, and there s no telling exactly when this will happen . The parameterless Dispose and Close methods should be both public and nonvirtual . Note You might notice that this SafeHandle class also offers a public Close method . This

Wait right there, Thrasymachus interrupted Good comments don t repeat the code or explain it They clarify its intent Comments should explain, at a higher level of abstraction than the code, what you re trying to do Right, Ismene said I scan the comments to find the section that does what I need to change or fix You re right that comments that repeat the code don t help at all because the code says everything already When I read comments, I want it to be like reading headings in a book, or a table of contents Comments help me find the right section, and then I start reading the code It s a lot faster to read one sentence in English than it is to parse 20 lines of code in a programming language Ismene poured herself another cup of coffee.

method simply calls Dispose . Some classes that offer the dispose pattern also offer a Close method for convenience; but the dispose pattern doesn t require this method . For example, the System.IO.FileStream class offers the dispose pattern, and this class also offers a Close method . Programmers find it more natural to close a file rather than dispose of a file . However, the System.Threading.Timer class doesn t offer a Close method even though it adheres to the dispose pattern .

I think that people who refuse to write comments (1) think their code is clearer than it could possibly be; (2) think that other programmers are far more interested in their code than they really are; (3) think other programmers are smarter than they really are; (4) are lazy; or (5) are afraid someone else might figure out how their code works Code reviews would be a big help here, Socrates, Ismene continued If someone claims they don t need to write comments and are bombarded by questions in a review several peers start saying, What the heck are you trying to do in this piece of code then they ll start putting in comments If they don t do it on their own, at least their manager will have the ammo to make them do it.

Important If a class defines a field in which the field s type implements the dispose pattern,

Figure 2.25 Visual Studio solution layout with a reference to a library project from the client project. This way, you can work simultaneously with two separate repositories.

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