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Gracefully Recovering from an Exception
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Sometimes you call a method knowing in advance some of the exceptions that the method might throw. Because you expect these exceptions, you might want to have some code that allows your application to recover gracefully from the situation and continue running. Here s an example in pseudocode.
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public String CalculateSpreadsheetCell(Int32 row, Int32 column) { String result; try { result = /* Code to calculate value of a spreadsheet s cell */ } catch (DivideByZeroException) { result = "Can t show value: Divide by zero"; } return result; }
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This pseudocode calculates the contents of a cell in a spreadsheet and returns a string representing the value back to the caller so that the caller can display the string in the application s window. However, a cell s contents might be the result of dividing one cell by another cell. If the cell containing the denominator contains 0, the CLR will throw a DivideByZeroException exception. In this case, the method catches this specific exception and returns a special string that will be displayed to the user. When you catch specific exceptions, fully understand the circumstances that cause the exception to be thrown and know what exception types are derived from the exception type you re catching. Don t catch and handle System.Exception because it s not feasible for you to know all the possible 325
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exceptions that could be thrown within your try block (especially if you consider OutOfMemoryException, OverflowException, StackOverflowException, or even ExecutionEngineException, to name a few).
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Backing Out of a Partially Completed Operation When an Unrecoverable Exception Occurs
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Usually methods call several other methods to perform a single abstract operation. Some of the individual methods might complete successfully, and some might not. For example, a method that transfers money from one account to another account might first add money to one account and then subtract money from the second account. If the first operation completes successfully but the second operations fails (for any reason), the money must be subtracted from the first account so that the accounts balance. Here is another, perhaps more meaningful, example: Let s say that you re serializing a set of objects to a disk file. After serializing 10 objects, an exception is thrown. (Perhaps the disk is full or the next object to be serialized isn t marked with the Serializable custom attribute.) At this point, the exception should filter up to the caller, but what about the state of the disk file The file is now corrupt because it contains a partially serialized object graph. It would be great if the application could back out of the partially completed operation so that the file would be in the state it was before any objects were serialized into it. The following code demonstrates the correct way to implement this:
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public void SerializeObjectGraph(FileStream fs, IFormatter formatter, Object rootObj) { // Save the current position of the file. Int64 beforeSerialization = fs.Position; try { // Attempt to serialize the object graph to the file. formatter.Serialize(fs, rootObj); } catch { // Catch all CLS and non CLS exceptions. // If ANYTHING goes wrong, reset the file back to a good state. fs.Position = beforeSerialization; // Truncate the file. fs.SetLength(fs.Position); // NOTE: The preceding code isn t in a finally block because // the stream should be reset only when serialization fails. // Let the caller(s) know what happened by // rethrowing the SAME exception. throw; } }
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To properly back out of the partially completed operation, write code that catches all exceptions. Yes, catch all exceptions here because you don t care what kind of error occurred; you need to put your data structures back into a consistent state. After you ve caught and handled the exception, don t swallow it let the caller know that the exception occurred. You do this by rethrowing the same exception. In fact, C# and many other languages make this easy. Just use C# s throw keyword without specifying anything after throw, as shown in the previous code.
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Notice that the catch block in the previous example doesn t specify any exception type because I want to catch non CLS compliant exceptions and CLS compliant exceptions. Fortunately, C# lets me do this easily by just not specifying any exception type and by making the throw statement rethrow whatever object is caught.
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