try, catch, ﬁnally, throw C# with Example
try, catch, finally, and throw allow you to handle exceptions in your code.
var processor = new InputProcessor();
// The code within the try block will be executed. If an exception occurs during execution of
// this code, execution will pass to the catch block corresponding to the exception type.
// If a FormatException is thrown during the try block, then this catch block
// will be executed.
catch (FormatException ex)
// Throw is a keyword that will manually throw an exception, triggering any catch block that is
// waiting for that exception type.
throw new InvalidOperationException("Invalid input", ex);
// catch can be used to catch all or any specific exceptions. This catch block,
// with no type specified, catches any exception that hasn't already been caught
// in a prior catch block.
throw; // Re-throws the original exception.
// The finally block is executed after all try-catch blocks have been; either after the try has
// succeeded in running all commands or after all exceptions have been caught.
Note: The return keyword can be used in try block, and the finally block will still be executed (just before
returning). For example:
The statement connection.Close() will execute before the result of connection.Get(query) is returned.