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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.

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