f# 处理多种异常类型的异常

Question

我正在尝试像在 c# 中一样根据异常类型捕获异常，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 在第 | :? System.Exception as genericException -> 行 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#?

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