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C# supports a broader range of data types for the switch expression, including enumerations, chars, and built in integer types. Most usefully, C# supports the use of strings as switch expressions. C# does not support falling through case clauses. A compile-time error occurs if a case clause is not terminated with a break or goto statement. C# does allow multiple case expressions on a single statement block. C# supports goto statements to jump from one case clause to another. Following a goto statement with a break statement results in a compiler warning.
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Figure 9-5. Unit Tests summary under the Build Results page The Test Results page gives you a more detailed view of each test executed, including timings. Figure 9-6 shows the Test Results page for the Lucene project. The metrics page provides a historical graph showing the distribution in time of good versus bad builds as well as a pie chart showing the percentage of good and bad builds. This view is a favorite of programming managers.
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As you can see, the only difference between this and the earlier TimeSeriesData class definition is that you specify the public member variables as data members using the [DataMember] attribute. Next, add a new service to your project. In the Add New Item dialog box, call the service PHService. You ll see that three new files are added to your solution: PHService.svc, PHService.svc.cs, and IPHService.cs.
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Windows Vista Editions at a Glance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1023 Working with the Command Prompt . . . . . . . . . . . . . . . . . . . . . . . . . . . 1029 Using and Customizing Microsoft Management Console . . . . . . . . . . 1051 Viewing System Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1071
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Part II Designing Types
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Exam objectives in this chapter:
Correct Answer: A
Now that you know how to apply a custom attribute, let s find out what an attribute really is . A custom attribute is simply an instance of a type . For Common Language Specification (CLS) compliance, custom attribute classes must be derived, directly or indirectly, from the public abstract System.Attribute class . C# allows only CLS-compliant attributes . By examining the .NET Framework SDK documentation, you ll see that the following classes (from the earlier example) are defined: StructLayoutAttribute, MarshalAsAttribute, DllImportAttribute, InAttribute, and OutAttribute . All of these classes happen to be defined in the System.Runtime.InteropServices namespace, but attribute classes can be defined in any namespace . Upon further examination, you ll notice that all of these classes are derived from System.Attribute, as all CLS-compliant attribute classes must be . Note When applying an attribute to a target in source code, the C# compiler allows you to
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Avoid gotos The original reason to avoid gotos was that they made it difficult to prove that a program was correct. That s a nice argument for all the people who want to prove their programs correct, which is practically no one. The more pressing problem for most programmers is that gotos make code hard to format. Do you indent all the code between the goto and the label it goes to What if you have several gotos to the same label Do you indent each new one under the previous one Here s some advice for formatting gotos:
modified version of the assembly . After you select the Perform Runtime Contract Checking check box for your project, Visual Studio will invoke this tool for you automatically whenever you build the project . This tool analyzes the IL in all your methods and it rewrites the IL so that any postcondition contracts are executed at the end of each method . If your method has multiple return points inside it, then the CCRewrite .exe tool modifies the method s IL code so that all return points execute the postcondition code prior to the method returning . The CCRewrite .exe tool looks in the type for any method marked with the [ContractInvariantMethod] attribute . The method can have any name but, by convention, people usually name the method ObjectInvariant and mark the method as private (as I ve done above) . The method must accept no arguments and have a void return type . When the CCRewrite .exe tool sees a method marked with this attribute, it inserts IL code at the end of every public instance method to call the ObjectInvariant method . This way, the object s state is checked as each method returns to ensure that no method has violated the contract . Note that the CCRewrite .exe tool does not modify a Finalize method or an IDisposable s Dispose method to call the ObjectInvariant method because it is OK for an object s state to be altered if it is considered to be destroyed or disposed . Also note that a single type can define multiple methods with the [ContractInvariantMethod] attribute; this is useful when working with partial types . The CCRewrite .exe tool will modify the IL to call all of these methods (in an undefined order) at the end of each public method . The Assert and Assume methods are unlike the other methods . First, you should not consider them to be part of the method s signature, and you do not have to put them at the beginning of a method . At runtime, these two methods perform identically: They just verify that the condition passed to them is true and throw an exception if it is not . However, there is another tool, the Code Contract Checker (CCCheck .exe) which analyzes the IL produced by the C# compiler in an attempt to statically verify that no code in the method violates a contract . This tool will attempt to prove that any condition passed to Assert is true, but it will just assume that any condition passed to Assume is true and the tool will add the expression to its body of facts known to be true . Usually, you will use Assert and then change an Assert to an Assume if the CCCheck .exe tool can t statically prove that the expression is true . Let s walk through an example . Assume that I have the following type definition:
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