F＃用户定义的异常

在F＃中, 你可以创建用户定义的异常。它提供了根据需求定义自定义异常的灵活性。让我们来看一个例子。

exception InvalidAgeException of string
let validate x = 
   if (x < 18) then 
     raise (InvalidAgeException "Sorry, Age must be greater than 18")
 
let TestUserDefinedException =
   try 
      validate 15
   with 
      | InvalidAgeException(e) -> printfn "%s" e
   printfn "Rest of the code"

TestUserDefinedException

输出：

Sorry, Age must be greater than 18
Rest of the code