是否存在“命令行参数异常不足”？

Question

What exception should I throw if I wrote a program that expects more than 2 command line parameters and the user gave it an insufficient amount of arguments? I want to use the integrated exception handling.

Answer 1

You shouldn't use an exception.

Indeed, as answered by @Jennifer, ArgumentException is the standard exception for invalid arguments. But this isn't quite what it's normally used for, not what other programmers will expect reading your code, and not what users will expect running your program.

ArgumentException normally indicates a programmer error, where you pass in an invalid argument. It indicates a bug in your code: you should fix the code to either pass in a valid argument, or avoid the call if you know you don't have a valid argument.

In this case, that's not possible. Getting invalid arguments into Main is a user error, not a programmer error, and user errors should be handled differently. Throwing an exception makes for a bad user experience: unhandled exceptions crash the program and get Windows to search online for a solution. All that should be done here is to print an error message, and ideally exit with a non-zero status code. There is no exception type that has that effect.

Answer 2

ArgumentException is the standard for invalid arguments.

The exception that is thrown when one of the arguments provided to a method is not valid.