f# 处理多种异常类型的异常

Question

我正在尝试根据 c# 中的异常类型捕获异常，但是当我执行以下操作时出现编译器错误This type test or downcast will always在线 | :? System.Exception as genericException ->F# 中不能有多个“catch”块吗？

try
    ......
with
| :? System.AggregateException as aggregateException ->
   for innerException in aggregateException.InnerExceptions do
                log message
| :? System.Exception as genericException ->
           log message

Answer 1

因为:? System.Exception as是多余的，代码可以简化为:

try
    // ...
with
| :? System.AggregateException as aggregateException ->
    for innerException in aggregateException.InnerExceptions do
        log message
| genericException -> log message

有关更多示例，请参阅此答案: How to catch any exception (System.Exception) without a warning in F#?