目录try..catch..finally未捕获的异常多个catch块 捕获所有异常引发异常重新抛出异常（throw）标准例外用户定义的异常设计准则try中的return语句先于finally中的函数执行结论C#中的异常处理是一种检测和处理代码
I have a model for which I want to retrieve the next record(s) and previous record(s).I want to do this via a named_scope on the model, and also pass in as an argument the X number of next/previous re
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