By Bill Wagner
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This C# providing takes a different method of support it stand out one of the various . internet programming titles to be had. The layout is definitely fitted to builders that already comprehend the fundamentals of . web programming and need a pragmatic reference for numerous programming projects. every one bankruptcy includes a quick advent to the subject to hand, through a couple of "recipes.
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Extra resources for Effective C# : 50 specific ways to improve your C#
EBook 46 ❘ Chapter 1 C# Language Idioms cannot be modiﬁed later. GetHashCode() returns this value as the hash code for a given object. GetHashCode() in light of those three rules. GetHashCode() returns the same hash value, unless you’ve overridden operator==. Object’s version of operator==() tests object identity. GetHashCode() returns the internal object identity ﬁeld. It works. However, if you’ve supplied your own version of operator==, you must also supply your own version of GetHashCode() to ensure that the ﬁrst rule is followed.
The compiler just doesn’t know or care. This statement has different behavior, depending on the declared type of st: t = (MyType)st; This next statement returns the same result, no matter what the declared type of st is. So, you should prefer as to casts—it’s more consistent. In fact, if the types are not related by inheritance, but a user-deﬁned conversion operator exists, the following statement will generate a compiler error: t = st as MyType; Now that you know to use as when possible, let’s discuss when you can’t use it.
You still need to review those conditional methods for side effects to the object state, but the Conditional attribute localizes those points much better than #if/#endif. With #if and #endif blocks, you can mistakenly remove important method calls or assignments. The previous examples use the predeﬁned DEBUG or TRACE symbols. But you can extend this technique for any symbols you deﬁne. The Conditional attribute can be controlled by symbols deﬁned in a variety of ways. You can deﬁne symbols from the compiler command line, from environment variables in the operating system shell, or from pragmas in the source code.