By Bill Wagner
C# has matured during the last decade It’s now a wealthy language with generics, useful programming recommendations, and help for either static and dynamic typing. This palette of recommendations offers nice instruments for plenty of diverse idioms, yet there also are many ways to make error. In potent C#, moment version, revered .NET professional invoice Wagner identifies fifty methods you could leverage the complete strength of the C# 4.0 language to specific your designs concisely and obviously.
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Additional resources for Effective C#, 2nd Edition: 50 Specific Ways to Improve Your C#
Anytime you create a value type, redeﬁne operator==(). The reason is exactly the same as with the instance Equals() function. The default version uses reﬂection to compare the contents of two value types. That’s far less efﬁcient than any implementation that you would write, so write your own. 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.
C# provides four different functions that determine whether two different objects are “equal”: public static bool ReferenceEquals (object left, object right); public static bool Equals (object left, object right); public virtual bool Equals(object right); public static bool operator ==(MyClass left, MyClass right); The language enables you to create your own versions of all four of these methods. But just because you can doesn’t mean that you should. You should never redeﬁne the ﬁrst two static functions.
You’ve broken the symmetric property of Equals. This construct broke because of the automatic conversions that take place up and down the inheritance hierarchy. Equals() determines that the ﬁelds deﬁned in its type match, the two objects are equal. Equals() method always returns false. If you don’t check the object types exactly, you can easily get into this situation, in which the order of the comparison matters. All of the examples above also showed another important practice when you override Equals().