By Bill Wagner
C# has matured over the last decade: It’s now a wealthy language with generics, sensible programming ideas, and help for either static and dynamic typing. This palette of strategies presents nice instruments for plenty of various idioms, yet there also are some ways to make blunders. In potent C#, moment variation, revered .NET specialist invoice Wagner identifies fifty methods you could leverage the entire energy of the C# 4.0 language to precise your designs concisely and obviously. powerful C#, moment variation, follows a transparent structure that makes it crucial to millions of builders: transparent, functional causes, professional tips, and lots of life like code examples. Drawing on his unsurpassed C# adventure, Wagner addresses every thing from varieties to source administration to dynamic typing to multicore help within the C# language and the .NET framework. alongside the best way, he exhibits the best way to stay away from universal pitfalls within the C# language and the .NET atmosphere. You’ll easy methods to Use either sorts of C# constants for potency and maintainability (see merchandise 2) hire immutable information forms to advertise multicore processing (see merchandise 20) reduce rubbish assortment, boxing, and unboxing (see goods sixteen and forty five) Take complete good thing about interfaces and delegates (see goods 22 even though 25) utilize the parallel framework (see goods 35 via 37) Use duck typing in C# (see merchandise 38) Spot some great benefits of the dynamic and Expression varieties over mirrored image (see goods forty two and forty three) verify why question expressions are higher than loops (see merchandise eight) know the way standard covariance and contravariance impact your designs (see merchandise 29) See how non-compulsory parameters can reduce the variety of procedure overloads (see merchandise 10) You’re already a winning C# programmer–this publication may also help you turn into a great one.
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Extra info for Effective C# 50 Specific Ways to Improve Your C# Second Edition (Covers C# 4.0)
Even though the two objects are different types, your method has considered them equal. 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.
You need to make sure that your deﬁnition and implementation are consistent with other programmers’ expectations. This means that you need to keep in mind the mathematical properties of equality: Equality is reﬂexive, symmetric, and transitive. The reﬂexive property means that any object is equal to itself. No matter what type is involved, a == a is always true. The symmetric property means that order does not matter: If a == b is true, b == a is also true. If a == b is false, b == a is also false.
Here, you would do that inside the foreach loop. The most common time when the exact runtime type is important is when doing equality tests (see Item 6). isinst comparisons provided by as and is are semantically correct. Cast
Effective C# 50 Specific Ways to Improve Your C# Second Edition (Covers C# 4.0) by Bill Wagner