Question

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?

Answer 1

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)   
       [||]