log4net 和“with try” F#

发布于 2025-01-08 12:00:21 字数 296 浏览 1 评论 0原文

我正在尝试使用 log4net 表达，但它不起作用。我认为缺少了一些东西，但我不知道是什么。这是我的代码：

let clusterIDArray = try
                         myfunction
                     with
                         log.Fatal("my function is not working")   


log.Debug("my function is working")

有什么想法吗？

原文

I am using log4net in a try with expression and it is not working. I think something is missing but I don't know what.
Here is my code :

let clusterIDArray = try
                         myfunction
                     with
                         log.Fatal("my function is not working")   


log.Debug("my function is working")

Any ideas?

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櫻之舞 2025-01-15 12:00:21

您的代码片段中有两个错误：

您没有执行您的函数。我想你确实在真实的代码中执行了它；这是编造一个例子的问题。
您没有捕获异常，或者您的 try...with... 块在语法上不正确。

假设我们在任何情况下捕获异常并返回一个数组，更惯用的日志记录方式可能是：

let clusterIDArray =
    try
       let result = myfunction args // Assume args are arguments declared before
       log.Debug("my function is working")
       result
    with 
    | ex ->
       // ex is of type exception which can be parsed by log4net
       log.Fatal("my function is not working: ", ex)   
       [||]

There are two mistakes in your code snippet:

You didn't execute your function. I suppose that you did execute it in your real code; it's the matter of making up an example.
You didn't catch exceptions or your try...with... block is not syntactically correct.

Assuming that we catch exceptions and return an array in any case, a more idiomatic way of logging could be:

let clusterIDArray =
    try
       let result = myfunction args // Assume args are arguments declared before
       log.Debug("my function is working")
       result
    with 
    | ex ->
       // ex is of type exception which can be parsed by log4net
       log.Fatal("my function is not working: ", ex)   
       [||]

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怼怹恏 2025-01-15 12:00:21

如果不知道 myfunction 是什么，就很难说，但在您编写代码时，代码实际上并没有运行该函数。它只是将其作为值返回（从 try .. with 块）并将其分配给 clusterIDArray 值，因此代码永远不会抛出异常。

如果函数只接受一个 unit 参数，您可以在 try .. with 块内调用它，如下所示（如果它接受一些参数，您需要给它们块内的函数）：

let clusterIDarray = 
  try 
    myfunction ()
  with _ ->
    log.Fatal("not working")
    reraise() // You still need to return something here or rethrow the exception

log.Debug("my function is working")

编辑正如其他人指出的，语法 with e 无效。如果你想忽略异常，你需要编写 with e -> 或 with _ -> 。

It is hard to say without knowing what the myfunction is, but as you wrote it, the code does not actually run the function. It simply returns it as a value (from the try .. with block) and assigns it to the clusterIDArray value, so the code will never throw.

If the function takes just a unit argument, you can call it inside the try .. with block like this (if it takes some arguments, you'll need to give them to the function inside the block):

let clusterIDarray = 
  try 
    myfunction ()
  with _ ->
    log.Fatal("not working")
    reraise() // You still need to return something here or rethrow the exception

log.Debug("my function is working")

EDIT As others noted, the syntax with e is not valid. You need to write with e -> or with _ -> if you want to ignore the exception.

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