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Throwing Exceptions
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Throwing exceptions is the same in C# as in Java. For example:
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throw new ExceptionClass();
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C# introduces a shorthand syntax for rethrowing caught exceptions: the throw statement with no parameters. This is required when using the new catch syntax described in the preceding section. For example:
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try { // Some code } catch { // Some exception handling code // Rethrow the caught exception throw; }
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6. Advanced Language Features
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The same performance issues with exceptions exist in C# as in Java. Throwing exceptions can be expensive and should not be used as a general flow control mechanism.
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The Exception Hierarchy
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The java.lang.Throwable class is the root of the Java exception class hierarchy. Two classes derive directly from Throwable: java.lang.Exception and java.lang.Error. Derived from Exception is a class named java.lang.RuntimeException. The Exception, Error, and RuntimeException subclasses of Throwable are central to the Java classification of exceptions into the checked and unchecked categories. Unchecked exceptions are those derived from either the Error or RuntimeException class. The compiler makes no attempt to ensure that these exceptions are handled by the developer since they generally occur because of a run-time or program error that should be fixed. Checked exceptions are those that the compiler ensures are caught and handled within the code or are declared in the throws clause of the method declaration. Checked exceptions include all exceptions derived from java.lang.Exception, excluding RuntimeException and its subclasses. Because C# function members cannot declare exceptions, the compiler makes no attempt to ensure that exceptions are caught and handled correctly. All .NET exceptions can be considered to be unchecked exceptions in Java terminology. .NET takes a simpler approach to classifying exceptions based on whether it is a system or an application-related exception. This is merely a convention and is not enforced by the compiler or the runtime. The root of the exception hierarchy in .NET is System.Exception. System exceptions are represented by System.SystemException and application exceptions by System.ApplicationException, both of which are derived from System.Exception.
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The System.Exception Class
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Table 6-1 compares the functionality of .NET's System.Exception class with that of the Java java.lang.Throwable class. Although not a part of either language specification, the use of exceptions is tightly integrated with both Java and C# and is appropriate to this chapter. Java and .NET both rely on the exception inheritance hierarchy as a classification mechanism to support the use of the catch clause.
Exception Chaining
Both .NET and Java version 1.4 support a standardized approach to exception chaining. This allows exceptions to be created and store a reference to another exception internally.
6. Advanced Language Features
The inner exception would usually be a reference to an exception that prompted the outer exception to be raised.
Table 6-1. Comparison of Java and C# Exception Members
Java Constructors Throwable() Throwable(String)
C# Exception() Exception(string)
Comments
Constructs a new exception instance. Constructs an exception with the specified message. Throwable(String, Exception(string, Exception) Constructs an exception with the specified message and chained Throwable) exception. Not supported in .NET; use the Throwable(Throwable) N/A previous constructor. N/A Exception(SerializationInfo, Constructs an exception from a previously serialized exception. See StreamingContext) GetObjectData near the end of this table. Member N/A Not supported. (Although fillInStackTrace() Environment.StackTrace can be used if only a stack trace is needed.) Gets the chained exception, or null if getCause() InnerException one has not been specified. .NET recommends that the message getLocalizedMessage() N/A available through the Message property be localized. Java provides this second method, which should be overridden by deriving classes to return a localized version of the message. Gets a message that describes the getMessage() Message exception. Gets the stack trace from the exception getStackTrace() StackTrace as a string. N/A Sets the chained exception reference. initCause() .NET allows this reference to be set only during construction. N/A Not supported. Use the ToString printStackTrace() method followed by the appropriate Stream or Console method. N/A Not supported. setStackTrace() N/A Gets or sets a link to related help HelpLink information. Should be in the form of a URN or URL.
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