c# - 我可以从我的应用程序中抛出哪些内置 .NET 异常？

Question

如果我需要从我的应用程序中抛出异常，我可以使用哪些内置的 .NET 异常类？他们都是公平的游戏吗？我什么时候应该自己导出？

Answer 1

参见 Creating and Throwing Exceptions .

在抛出内置异常时，它说:

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

和

Do Not Throw General Exceptions

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.

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

这blog entry还有一些有用的指南。

此外，FxCop 代码分析将“不引发异常”列表定义为 described here .它建议:

The following exception types are too general to provide sufficient information to the user:

• System.Exception
• System.ApplicationException
• System.SystemException

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

• System.ExecutionEngineException
• System.IndexOutOfRangeException
• System.NullReferenceException
• System.OutOfMemoryException

因此理论上您可以引发任何其他框架异常类型，前提是您清楚地了解 Microsoft 描述的异常的意图(请参阅 MSDN 文档)。

请注意，这些是“准则”，正如其他一些人所说，围绕 System.IndexOutOfRangeException(即许多开发人员抛出此异常)存在争议。