从类库中抛出单个自定义异常

Question

How can I write a catch all exception handler in a Class Library project in C#, which will give the outside caller only one Custom Exception on any exception occurring in the library.

Most nearest solution I found is to implement a Facade class, call low level classes from it, and write try..catch in every call from Facade which will throw single custom exception if any exception occurs underneath.

I searched for solutions, but got it only for Web Applications (using Application context for catching exceptions) eg How to implement one "catch'em all" exception handler with resume?

I need to implement it at Class Library level or at consumer of library level, but good if that can be done by write minimum exception handling statements.

Answer 1

You could use:

AppDomain.CurrentDomain.UnhandledException += (sender, e) =>
    {
        var exception = e.ExceptionObject as Exception;
        if (exception != null && exception.Source == "MyLib")
        {
            // Do stuff here
        }
    };

But seriously, don't do it. Exceptions shouldn't be handled this way, you should catch them locally.

Answer 2

您可以使用AppDomain.UnhandledException但请确保彻底阅读文档 - 有一些您无法处理的异常，它还取决于您使用的框架版本。