A return Statement before the End of a Method in Visual C#.NET

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Listing 45 A return Statement before the End of a Method
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class Program { static void Main() { string command; // switch(command) { case "quit": return; // } // } }
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A return statement indicates a jump to the end of the method, so no break is required in a switch statement Once the execution encounters a return, the method call will end If particular code paths include statements following the return, then the compiler will issue a warning that indicates the additional statements will never execute In spite of the C# allowance for early returns, code is generally more readable if there is a single exit location rather than multiple returns sprinkled through various code paths of the method Specifying void as a return type indicates that there is no return from the method As a result, the method does not support assignment to a variable or use as a parameter Furthermore, the return statement becomes optional, and when it is specified, there is no value following the return keyword For example, the return of Main() in Listing 44 is void and there is no return statement within the method However, DisplayGreeting() includes a return statement that is not followed by any returned result
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Unlike C++, C# classes never separate the implementation from the declaration In C# there is no header (h) file or implementation (cpp) file Instead, declaration and implementation always appear together in the same file In C# 20, it is possible to spread a class across multiple files known as partial types However, even then the declaration of a method and the implementation of that method must remain together For C# to declare types and methods inline makes a cleaner and more maintainable language
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The using Directive
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It is possible to import types from one namespace into the enclosing namespace scope As a result, it would not be necessary for the programmer to fully qualify a type To achieve this, the C# programmer includes a using directive, generally at the top of the file For example, in Listing 46, Console is not prefixed with System Instead, it includes the using directive, using System, at the top of the listing
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Listing 46 using Directive Example
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// The using directive imports all types from the // specified namespace into the enclosing scopein // this case, the entire file using System; class HelloWorld { static void Main() { // No need to qualify Console with System // because of the using directive above ConsoleWriteLine("Hello, my name is Inigo Montoya"); } }
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The results of Listing 46 appear in Output 42
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Output 42
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Hello, my name is Inigo Montoya
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A using directive like using System does not enable the omission of System from a method within a more specific namespace If code accessed a type within SystemText, for example, you would have to either include an additional using directive for SystemText, or fully qualify the type The using directive does not import any nested namespaces Nested namespaces, identified by the period in the namespace, need to be imported explicitly
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Java allows for importing namespaces using a wildcard such as: import javaxswing*;
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In contrast, C# does not support a wildcard using directive, and instead requires each namespace to be imported explicitly
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Unlike C#, Visual Basic NET supports the ability to specify the using directive equivalent, Imports, for an entire project, rather than just for a specific file In other words, Visual Basic NET provides a command-line means of the using directive that will span an entire compilation
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Typically, prevalent use of types within a particular namespace results in a using directive for that namespace, instead of fully qualifying all types within the namespace Following this tendency, virtually all files include the using System directive at the top Throughout the remainder of this book, code listings will often omit the using System directive Other namespace directives will be included explicitly, however One interesting effect of the using System directive is that the string data type can be identified with varying case: String or string The former version relies on the using System directive and the latter uses the string keyword Both are valid C# references to the SystemString data type, and the resulting CIL code is unaffected by which version is chosen[1]
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I prefer the string keyword, but whichever representation a programmer selects, ideally code within a project should be consistent
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