By Trey Nash
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Extra info for Accelerated C♯ 2005
Boxing conversions are required when you must pass a value type to a method or assign it to a variable as a reference type. What happens is that an object is allocated dynamically on the heap that contains a field of the value’s type. The value is then copied into this field. I cover boxing in C# extensively in Chapter 4. ToString() ); } } At the point where the object variable boxedID is assigned from the int variable employeeID, boxing occurs. A heap-based object is created and the value of employeeID is copied into it.
Assemblies make it possible to run distinct versions of code without experiencing DLL Hell, and they also provide the basis for developing and sharing components across languages. In the next chapter, I’ll lead you on a whirlwind 20,000-foot view of the C# language syntax. Since I cannot take the time to cover every minute syntactic detail, I recommend that you also reference the C# language specification as well. qxd 8/4/06 9:45 AM CHAPTER Page 15 3 ■■■ C# Syntax Overview T his chapter introduces you to the syntax of the C# language.
Type object when you reflect upon types in the assembly. GetType(), and a few other ways. Generally, the typeof keyword is more efficient because it is computed at compile time, whereas GetType(), although more flexible since you can pass it an arbitrary string, is executed at run time. Once you have a type object, you can find out if it is a class, an interface, a struct, or so on, what methods it has, and the number and types of fields it contains. Because assemblies are self-describing, the only thing the C# compiler needs to resolve type usages is a list of referenced assemblies as it compiles and builds the program.
Accelerated C♯ 2005 by Trey Nash