Deeply understand the difference between throw and throw new Exception()] In exception handling, there are significant differences in the use effects of

and throw new Exception(). Let's dive into their respective behaviors:

throw: retain the original exception information] The

statement retrolls the currently active exception. When used in the catch block, it retains the type, message, and stack trace of the original exception. This allows the exception to continue to propagate without being modified.

try { ... }
catch { throw }

block, the catch block will re-throw the same exception, with its original information intact.

throw new Exception(): Reset stack trace] On the other hand,

creates a new exception instance and uses the specified message. This action resets the stack trace, deleting all trace information that occurred before the catch block.

try{ ... }
catch(Exception e) {throw new Exception(e.message) }

block, the catch block will create a new exception with the message of the original exception, but the stack trace starts from the catch block itself.

throw ex Highly recommend not to use

in the catch block. Doing so will cause the original exception to propagate, but the stack trace will be reset. This makes debugging the source of exceptions very difficult.

] In some cases, it may be necessary to wrap all exceptions in a custom exception object to provide additional information. To do this, define a new exception class inherited from

, including all four exception constructors. Optionally, you can add an additional constructor that accepts the original exception and extra information. When throwing a custom exception, be sure to pass the original exception as an internal exception parameter to preserve its stack trace and other properties.