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Labels have their own declaration space, so the identifier in a labeled statement can be any valid identifier including those that might be declared in an overlapping scope, such as local variables or parameter names. For example, the following code shows the valid use of a label with the same identifier as a local variable: { int xyz = 0; ... xyz: Console.WriteLine("No problem."); } There are restrictions, however. The identifier cannot be either The same as another label identifier with an overlapping scope A keyword // Variable xyz // Label xyz
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CHAPTER 9 STATEMENTS
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The Scope of Labeled Statements
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Labeled statements cannot be seen (or accessed) from outside the block in which they are declared. The scope of a labeled statement is The block in which it is declared Any blocks nested inside that block For example, the code on the left of Figure 9-9 contains several nested blocks, with their scopes marked. There are two labeled statements declared in Scope B of the program: increment and end. The shaded portions on the right of the figure show the areas of the code in which the labeled statements are in scope. Code in Scope B, and all the nested blocks, can see and access the labeled statements. Code from any of the inner scopes can jump out to the labeled statements. Code from outside (Scope A, in this case) cannot jump into a block with a labeled statement.
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Figure 9-9. The scope of labels includes nested blocks.
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CHAPTER 9 STATEMENTS
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The goto Statement
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The goto statement unconditionally transfers control to a labeled statement. Its general form is the following, where Identifier is the identifier of a labeled statement: goto Identifier ; For example, the following code shows the simple use of a goto statement: bool ThingsAreFine; while (true) { ThingsAreFine = MonitorNuclearReactor(); if ( ThingsAreFine ) Console.WriteLine("Things are fine."); else goto NotSoGood; } NotSoGood: Console.WriteLine("We have a problem."); The goto statement must be within the scope of the labeled statement. A goto statement can jump to any labeled statement within its own block, or out to any block in which it is nested. A goto statement cannot jump into any blocks nested within its own block.
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Caution Using the goto statement is strongly discouraged, as it can lead to code that is poorly structured, and difficult to debug and maintain. Edsger Dijkstra s 1968 letter to the Communications of the ACM, entitled Go To Statement Considered Harmful, was an important point in the history of computer science; it was one of the first published descriptions of the pitfalls of using the goto statement.
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The goto Statement Inside a switch Statement
There are also two other forms of the goto statement, for use inside switch statements. These goto statements transfer control to the correspondingly named switch label in the switch statement. goto case ConstantExpression; goto default;
CHAPTER 9 STATEMENTS
The using Statement
It is imperative that certain types of objects be allowed to clean up and free the unmanaged resources they are holding. The using statement is used to simplify the process and ensure that these resources are properly disposed of. A resource is a class or struct that implements the System.IDisposable interface. Interfaces are covered in detail in 17 but in short, an interface is a collection of unimplemented function members that classes and structs can choose to implement. The IDisposable interface contains a single method named Dispose. The phases of using a resource are shown in Figure 9-10, and consist of the following: Allocating the resource Using the resource Disposing of the resource If an unexpected runtime error occurs during the portion of the code using the resource, the code disposing of the resource might not get executed.
Figure 9-10. Components of using a resource
Note The using statement is different than the using directives. The using directives are covered in
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