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This example turns off the rule that says you must assign a strong name for your assembly. You can customize this call as you wish, but doing so takes some work. It s a lot easier to use the FxCop GUI and filter the assemblies visually, as shown in figure 8.6. Let s say you ve configured your FxCop project and saved it as CiDotNet.FxCop. You can now use it with FxCopCmd.exe:

.method public hidebysig static void Main() cil managed { .entrypoint // Code size 25 (0x19) .maxstack 8 IL_0000: nop IL_0001: ldstr "Max entries supported in list: " IL_0006: ldc.i4.s 50 IL_0008: box [mscorlib]System.Int32 IL_000d: call string [mscorlib]System.String::Concat(object, object) IL_0012: call void [mscorlib]System.Console::WriteLine(string) IL_0017: nop IL_0018: ret } // end of method Program::Main

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They inherently violate encapsulation and limit future flexibility Strongly consider hiding public data members behind access routines A subclass uses only a small percentage of its parents routines Typically this indicates that that subclass has been created because a parent class happened to contain the routines it needed, not because the subclass is logically a descendent of the superclass Consider achieving better encapsulation by switching the subclass s relationship to its superclass from an is-a relationship to a has-a relationship; convert the superclass to member data of the former subclass and expose only the routines in the former subclass that are really needed Comments are used to explain difficult code Comments have an important role to play, but they should not be used as a crutch to explain bad code The age-old wisdom is dead on: Don t document bad code rewrite it (Kernighan and Plauger 1978)..

This example should make the versioning problem obvious to you . If the developer changes the MaxEntriesInList constant to 1000 and only rebuilds the DLL assembly, the application assembly is not affected . For the application to pick up the new value, it will have to be recompiled as well . You can t use constants if you need to have a value in one assembly picked up by another assembly at runtime (instead of compile time) . Instead, you can use readonly fields, which I ll discuss next .

improperly . If the field were public, any code could alter the value in the field and potentially wipe out all of the delegates that have registered interest in the event . The second construct the C# compiler generates is a method that allows other objects to register their interest in the event . The C# compiler automatically names this function by prepending add_ to the event s name (NewMail) . The C# compiler automatically generates the code that is inside this method . The code always calls System.Delegate s static Combine method, which adds the instance of a delegate to the list of delegates and returns the new head of the list, which gets saved back in the field . The third construct the C# compiler generates is a method that allows an object to unregister its interest in the event . Again, the C# compiler automatically names this function by prepending remove_ to the event s name (NewMail) . The code inside this method always calls Delegate s static Remove method, which removes the instance of a delegate from the list of delegates and returns the new head of the list, which gets saved back in the field . Warning If you attempt to remove a method that was never added, then Delegate s Remove

Global variables are used When you revisit a section of code that uses global variables, take time to reexamine them. You might have thought of a way to avoid using global variables since the last time you visited that part of the code. Because you re less familiar with the code than when you first wrote it, you might now find the global variables sufficiently confusing that you re willing to develop a cleaner approach. You might also have a better sense of how to isolate global variables in access routines and a keener sense of the pain caused by not doing so. Bite the bullet and make the beneficial modifications. The initial coding will be far enough in the past that you can be objective about your work yet close enough that you will still remember most of what you need in order to make the revisions correctly. The time during early revisions is the perfect time to improve the code. A routine uses setup code before a routine call or takedown code after a routine call Code like this is a warning: