422: Rethrowing an Exception in C#

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Listing 422: Rethrowing an Exception
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catch(Exception exception) { ConsoleWriteLine( "Rethrowing unexpected error: exceptionMessage); throw; }
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Avoid Using Exception Handling to Deal with Expected Situations
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As with most languages, C# incurs a performance hit when throwing an exception, especially the first time the error-handling infrastructure needs to be loaded For example, running Listing 418 and entering an invalid age demonstrates a noticeable pause while the program throws and handles the exception Because of the performance cost associated with throwing exceptions, developers should make an effort to avoid throwing exceptions for expected conditions or normal control flow For example, developers should not expect users to enter valid text when specifying their age2 Therefore, instead of relying on an exception to validate data entered by the user, developers should provide a means of checking the data before attempting the conversion Better yet, you should prevent the user from entering invalid data in the first place
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2 In general, developers should expect their users to perform unexpected actions, and therefore should code defensively to handle stupid user tricks
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4: Methods and Parameters
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ADVANCED TOPIC Numeric Conversion with TryParse() One of the problems with the Parse() method is that the only way to determine whether the conversion will be successful is to attempt the cast and then catch the exception if it doesn t work Because throwing an exception is a relatively expensive operation, it is better to attempt the conversion without exception handling In the first release of C#, the only data type that enabled this was a double method called doubleTryParse() However, the CLI added this method to all numeric primitive types in the CLI 20 version It requires the use of the out keyword because the return from the TryParse() function is a bool rather than the converted value Here is a code listing that demonstrates the conversion using intTryParse()
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if (intTryParse(ageText, out age)) { SystemConsoleWriteLine( "Hi {0}! You are {1} months old", firstName, age * 12); } else { SystemConsoleWriteLine( "The age entered ,{0}, is not valid", ageText); }
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With the TryParse() method, it is no longer necessary to include a try/catch block simply for the purpose of handling the string-to-numeric conversion
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SUMMARY
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This chapter discussed the details of declaring and calling methods In many ways, this construct is identical to its declaration in C-like languages However, the addition of the keywords out and ref are more like COM (the predecessor to CLI technology) than C-like language features In addition to method declaration, this chapter introduced exception handling
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Summary
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Methods are a fundamental construct that is a key to writing readable code Instead of writing large methods with lots of statements, you should use methods for paragraphs within your code, whose lengths target roughly 10 lines or less The process of breaking large functions into smaller pieces is one of the ways you can refactor your code to make it more readable and maintainable The next chapter considers the class construct and how it encapsulates methods (behavior) and fields (data) into a single unit
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Classes
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1 how to declare a new class called HelloWorld In 2, you learned about the built-in primitive types included with C# Since you have now also learned about control flow and how to declare methods, it is time to discuss defining your own types This is the core construct of any C# program, and the complete support for classes
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OU BRIEFLY SAW IN CHAPTER
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Partial classes Nested classes
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Extension Methods
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Defining and Instantiating a Class
Special Classes
Declaring a property Naming conventions Using properties with validation Read-only and write-only properties Access modifiers on getters and setters Properties as virtual fields Properties and method calls not allowed as ref or out parameter values Static fields Static methods Static constructors Static classes
2 Classes
Instance Fields
Declaring an instance field Accessing an instance field Const and readonly modifiers
Properties
Instance Methods
Access Modifiers
Static
Constructors & Finalizers
Declaring a constructor Default constructors Overloading constructors Calling one constructor using this Finalizers