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5 Primitive, Reference, and Value Types
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System.Object
CLS-Compliant
Description
To the common language runtime (CLR), dynamic is identical to object . However, the C# compiler allows dynamic variables to participate in dynamic dispatch using a simplified syntax . For more information, see The dynamic Primitive Type section at the end of this chapter .
Another way to think of this is that the C# compiler automatically assumes that you have the following using directives (as discussed in 4, Type Fundamentals ) in all of your source code files:
using using using using using using ... sbyte byte short ushort int uint = = = = = = System.SByte; System.Byte; System.Int16; System.UInt16; System.Int32; System.UInt32;
The C# language specification states, As a matter of style, use of the keyword is favored over use of the complete system type name . I disagree with the language specification; I prefer to use the FCL type names and completely avoid the primitive type names . In fact, I wish that compilers didn t even offer the primitive type names and forced developers to use the FCL type names instead . Here are my reasons:
I ve seen a number of developers confused, not knowing whether to use string or String in their code . Because in C# string (a keyword) maps exactly to System.String (an FCL type), there is no difference and either can be used . Similarly, I ve heard some developers say that int represents a 32-bit integer when the application is running on a 32-bit OS and that it represents a 64-bit integer when the application is running on a 64-bit OS . This statement is absolutely false: in C#, an int always maps to System.Int32, and therefore it represents a 32-bit integer regardless of the OS the code is running on . If programmers would use Int32 in their code, then this potential confusion is also eliminated . In C#, long maps to System.Int64, but in a different programming language, long could map to an Int16 or Int32 . In fact, C++/CLI does treat long as an Int32 . Someone reading source code in one language could easily misinterpret the code s intention if he or she were used to programming in a different programming language . In fact, most languages won t even treat long as a keyword and won t compile code that uses it .
Part II Designing Types
The FCL has many methods that have type names as part of their method names . For example, the BinaryReader type offers methods such as ReadBoolean, ReadInt32, ReadSingle, and so on, and the System.Convert type offers methods such as ToBoolean, ToInt32, ToSingle, and so on . Although it s legal to write the following code, the line with float feels very unnatural to me, and it s not obvious that the line is correct:
BinaryReader br = new BinaryReader(...); float val = br.ReadSingle(); // OK, but feels unnatural Single val = br.ReadSingle(); // OK and feels good
Many programmers that use C# exclusively tend to forget that other programming languages can be used against the CLR, and because of this, C#-isms creep into the class library code . For example, Microsoft s FCL is almost exclusively written in C# and developers on the FCL team have now introduced methods into the library such as Array s GetLongLength, which returns an Int64 value that is a long in C# but not in other languages (like C++/CLI) . Another example is System.Linq.Enumerable s LongCount method .
For all of these reasons, I ll use the FCL type names throughout this book . In many programming languages, you would expect the following code to compile and execute correctly:
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