Effective C#, 2nd Edition: 50 Specific Ways to Improve Your by Bill Wagner PDF

By Bill Wagner

C# has matured during the last decade It’s now a wealthy language with generics, useful programming techniques, and help for either static and dynamic typing. This palette of recommendations presents nice instruments for plenty of various idioms, yet there also are many ways to make error. In powerful C#, moment variation, revered .NET professional invoice Wagner identifies fifty methods you could leverage the entire strength of the C# 4.0 language to specific your designs concisely and obviously.

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Follow the recommendations in Item 46 to avoid boxing when you compare value types. Notice that I didn’t say that you should write operator==() whenever you override instance Equals(). I said to write operator==() when you create value types. You should rarely override operator==() when you create reference types. NET Framework classes expect operator==() to follow reference semantics for all reference types. Array and the Tuple<> generic classes. It enables those types to implement value semantics without enforcing value semantics for every comparison.

Just return false for all failure conditions, such as null references or the wrong argument types. Now, let’s go through this method in detail so you understand why each check is there and why some checks can be left out. The first check determines whether the right-side object is null. There is no check on this reference. In C#, this is never null. The CLR throws an exception before calling any instance method through a null reference. The next check determines whether the two object references are the same, testing object identity.

Furthermore, there are relationships among these four functions, so when you change one, you can affect the behavior of the others. Yes, needing four functions to test equality is complicated. But don’t worry—you can simplify it. Of course, those four methods are not the only options for equality. Types that override Equals() should implement IEquatable. Types that implement value semantics should implement the IStructuralEquality interface. That means six different ways to express equality.

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