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The out keyword is used the same and has the same effect as ref, but variables modified with the out keyword don't have to be initialized before they're passed into a function member. In the following example, without the use of the out keyword in the declaration and invocation of the OutParamTest method, a compiler error would be raised because the variable x is not initialized before it's used:
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public class MyClass { public static void OutParamTest(out int x) { x = 5; } public static void Main() { int x; MyClass.OutParamTest(out x); System.Console.WriteLine("x = " + x); } }
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Within the called function member (OutParamTest), any out parameters are initially unassigned, as the compiler does not assign them default values. Hence they must be manually initialized before they can be used; otherwise, a compile-time error will occur. A compile-time error will also occur if the out parameter is not assigned a value before the member returns.
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Java provides a set of data types suitable for the resolution of most contemporary business computing problems. However, the unified type system provided by the .NET Framework, as well as the extended selection of C# data and member types, offers greater flexibility and more control to the programmer.
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6. Advanced Language Features
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This chapter explores some advanced features of the C# language, including exception handling, attributes, preprocessor directives, and unsafe code. Although the Java programmer will be familiar with exception handling, many of these features have no analog in Java and demonstrate the strong C/C++ heritage of C#.
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C# and Microsoft .NET provide a richer set of threading and synchronization capabilities than Java. As with Java, most of these capabilities are exposed through the class libraries, not the language syntax. The lock keyword is the only C# statement related to threading and synchronization. See the "Statements" section in 4, "Language Syntax and Features," for a complete description of the lock statement.
More Information
For complete coverage of threading and synchronization, see 13, "Threading and Synchronization."
Exceptions and Exception Handling
The exception-handling features of C# will be familiar to the Java programmer; the exceptionhandling syntax is predominantly the same, although the languages differ significantly in their exception declaration requirements.
Declaring Exceptions
There is no requirement, and no ability, in C# for a function member to programmatically declare the exceptions it might throw. The only way to do so is in the API documentation. This has two consequences:
Java developers are accustomed to methods explicitly declaring the checked exceptions they might throw. The absence of a throws declaration means that the programmer is more reliant on API documentation than on the compiler. Interface members cannot specify which exceptions the member implementations are expected to throw. A full and accurate implementation of an interface member can be achieved only by a disciplined developer referring to and accurately interpreting the interface documentation.
Catching Exceptions
The following example demonstrates the familiar try catch finally exception-handling syntax, along with new catch syntax introduced by C#:
6. Advanced Language Features try { // code that might throw an exception } catch (ExceptionClass1 ex1) { // catch clause 1 // code to handle exceptions of class ExceptionClass1 // with access to the thrown exception named ex1 } catch (ExceptionClass2) { // catch clause 2 // code to handle exceptions of class ExceptionClass2 // but without access to the Exception instance } catch { // catch clause 3 // code to handle any Exception, but without access // to the Exception instance } finally { // code that executes no matter whether // the try block succeeds or fails }
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Catch clause 1 is exactly the same as the Java syntax. Catch clause 2 allows the programmer to catch an exception without declaring a local variable; there is no access to the exception caught. Catch clause 3, known as a general catch clause, is used to capture any previously unhandled exception regardless of type. Because all run-time exceptions inherit from System.Exception, it is simply a shorthand form of writing the following:
try { // Some code } catch (System.Exception) { // Some exception-handling code }
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