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Object-oriented Programming in C# Exception Handling * Fundamental Questions about Exception Handling What is the motivation? What is an error? What is normal? What is exceptional? Examples of normal and exceptional aspects When are errors detected? How are errors handled? Where are errors handled? * Conventional Exception Handling Exception Handling Approaches Mixing normal and exceptional cases * Object-oriented Exception Handling Errors as Objects Classification of Errors * Exceptions and Exception Handling in C# Exceptions in a C# program The try-catch statement C# Handling exceptions in C# The hierarchy of exceptions in C# The class System.Exception in C# Handling more than one type of exception in C# Propagation of exceptions in C# Raising and throwing exceptions in C# Try-catch with a finally clause Rethrowing an exception Raising an exception in an exception handler Comparison with exception handling in Java * Recommendations about exception handling Recommendations about exception handling Recommendations about exception handling

Use of the Console class for redirection of the error stream

Returning error codes Like in many C programs In conflict with a functional programming style, where we need to return data

Set global error status variables Almost never attractive

Raise and handle exceptions A special language mechanism to raise an error Rules for propagation of errors Special language mechanisms for handling of errors