本文强调了在编程中使用throw语句而不是throw ex的重要性。如果使用throw ex，则异常的堆栈跟踪将从重新抛出的位置开始，这通常不是期望的效果。
Note: It is very important to just use the throw statement, rather than throw ex. If you have "throw ex", then the stack trace of the exception will be replaced with a stack trace starting at the re-throw point, which is usually not the desired effect.
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