如果我需要从我的应用程序，它的内置.NET异常类我可以用抛出一个异常？他们都是公平的游戏？我应该在什么时候得到我自己的？

If I need to throw an exception from within my application which of the built-in .NET exception classes can I use? Are they all fair game? When should I derive my own?

推荐答案

请参阅创建和引发异常的。

在投掷内置例外，它说：

On throwing built-in exceptions, it says:

不要从你自己的源$ C ​​$ C抛出System.Exception的，System.SystemException，System.NullReferenceException或System.IndexOutOfRangeException故意。

Do not throw System.Exception, System.SystemException, System.NullReferenceException, or System.IndexOutOfRangeException intentionally from your own source code.

和

不要扔一般例外

如果你把一个一般异常类型，如异常或SystemException的库或框架，它迫使消费者捕获所有异常，包括未知异常，他们不知道如何处理。

If you throw a general exception type, such as Exception or SystemException in a library or framework, it forces consumers to catch all exceptions, including unknown exceptions that they do not know how to handle.

相反，无论是抛出已存在的框架更派生类型，或者创建自己的类型，它源于例外。

Instead, either throw a more derived type that already exists in the framework, or create your own type that derives from Exception."

这博客条目也有一些有用的指导方针。

This blog entry also has some useful guidelines.

此外，FxCop的code分析定义的不抛出异常为的此处描述。它建议：

Also, FxCop code analysis defines a list of "do not raise exceptions" as described here. It recommends:

下面的异常类型过于笼统，以提供足够的信息给用户：

The following exception types are too general to provide sufficient information to the user:    System.Exception的    System.ApplicationException    System.SystemException    System.Exception System.ApplicationException System.SystemException

下面的异常类型被保留，应该由公共语言运行时只抛出：

The following exception types are reserved and should be thrown only by the common language runtime:

   System.ExecutionEngineException    System.IndexOutOfRangeException    System.NullReferenceException   的System.OutOfMemoryException    System.ExecutionEngineException System.IndexOutOfRangeException System.NullReferenceException System.OutOfMemoryException

所以理论上你可以提出任何其他的框架异常类型，为您提供清晰的了解异常的意图所描述的微软（参见MSDN文档）。

So in theory you can raise any other framework exception type, providing you clearly understand the intent of the exception as described by Microsoft (see MSDN documentation).

请注意，这些都是准则和其他一些人也表示，目前各地System.IndexOutOfRangeException是一个有争议（即不少开发商抛出此异常）。

Note, these are "guidelines" and as some others have said, there is debate around System.IndexOutOfRangeException (ie many developers throw this exception).