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int number1 char letter float pi int number2
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42 'A' 314F 42 Stack
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int number1 = 42; char letter = 'A'; float pi = 314F; int number2 = number1; //
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Figure 21: Value Types Contain the Data Directly
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2: Data Types
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inside the method will not affect the original value within the calling function Since value types require a memory copy, they generally should be defined to consume a small amount of memory (less than 16 bytes)
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Reference Types Reference types and the variables that refer to them point to the data storage location Reference types store the reference where the data is located instead of storing the data directly Therefore, to access the data the runtime will read the memory location out of the variable and then jump to the location in memory that contains the data The memory area of the data a reference type points to is the heap (see Figure 22)
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int number1 char letter float pi int number2 string text StringReader reader
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42 'A' 314F 42 0x00A61234 0x00A612C0
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// int number1 = 42; char letter = 'A'; float pi = 314F; int number2 = number1; //
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using SystemIO;
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Heap
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Figure 22: Reference Types Point to the Heap
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Nullable Modifier
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A reference type does not require the same memory copy of the data that a value type does, resulting in circumstances when it is more efficient When assigning one reference type variable to another reference type variable, only a memory copy of the address occurs, and as such, the memory copy required by a reference type is always the size of the address itself (A 32-bit processor will copy 32 bits and a 64-bit processor will copy 64 bits, and so on) Obviously, not copying the data would be faster than a value type s behavior if the latter s data size is large Since reference types copy only the address of the data, two different variables can point to the same data Furthermore, changing the data through one variable will change the data for the other variable as well This happens both for assignment and for method calls Therefore, a method can affect the data of a reference type back at the caller For this reason, a key determinant factor in the choice between defining a reference type or a value type is whether the object is logically like an immutable value of fixed size, and therefore a value type Besides string and any custom classes such as Program, all types discussed so far are value types However, most types are reference types Although it is possible to define custom value types, it is relatively rare to do so in comparison to the number of custom reference types
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As I pointed out earlier, value types cannot be assigned null because, by definition, they can t contain references, including references to nothing However, this presents a problem in the real world, where values are missing When specifying a count, for example, what do you enter if the count is unknown One possible solution is to designate a magic value, such as 0 or intMaxValue, but these are valid integers Rather, it is desirable to assign null to the value type because this is not a valid integer To declare variables that can store null you use the nullable modifier, This feature, which started with C# 20, appears in Listing 219
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