custom-exceptions

问题 What are industry standard best practices for implementing custom exceptions in C#? I have checked Google and there's a great number of recommendations, however I don't know which ones hold more credibility. If anybody has any links to authoritative articles, that would also be helpful. 回答1: The standard for creating custom exceptions is to derive from Exception. You can then introduce your own properties/methods and overloaded constructors (if applicable). Here is a basic example of a custom

问题 I have read a few of the other questions regarding C# Exception Handling Practices but none seem to ask what I am looking for. If I implement my own custom Exception for a particular class or set of classes. Should all errors that relate to those classes be encapsulated into my exception using inner exception or should I let them fall through? I was thinking it would be better to catch all exceptions so that the exception can be immediately recognized from my source. I am still passing the

问题 Is it possible to create user-defined exceptions and be able to change the SQLERRM? For example: DECLARE ex_custom EXCEPTION; BEGIN RAISE ex_custom; EXCEPTION WHEN ex_custom THEN DBMS_OUTPUT.PUT_LINE(SQLERRM); END; / The output is \"User-Defined Exception\". Is it possible to change that message? EDIT: Here is some more detail. I hope this one illustrates what I\'m trying to do better. DECLARE l_table_status VARCHAR2(8); l_index_status VARCHAR2(8); l_table_name VARCHAR2(30) := \'TEST\'; l

问题 What\'s the proper way to declare custom exception classes in modern Python? My primary goal is to follow whatever standard other exception classes have, so that (for instance) any extra string I include in the exception is printed out by whatever tool caught the exception. By \"modern Python\" I mean something that will run in Python 2.5 but be \'correct\' for the Python 2.6 and Python 3.* way of doing things. And by \"custom\" I mean an Exception object that can include extra data about the

问题 Is there some way I can show custom exception messages as an alert in my jQuery AJAX error message? For example, if I want to throw an exception on the server side via Struts by throw new ApplicationException(\"User name already exists\"); , I want to catch this message (\'user name already exists\') in the jQuery AJAX error message. jQuery(\"#save\").click(function () { if (jQuery(\'#form\').jVal()) { jQuery.ajax({ type: \"POST\", url: \"saveuser.do\", dataType: \"html\", data: \"userId=\" +