f部分函数的异常处理

像这样?

// f <- foo(); bar(); etc...
// k <- unprotected continuation
let runProtected f k = 
    if try f(); true with _ -> false 
    then k()
    else null

// sample from the question 
let runProtected () = 
    if try 
        foo(); bar();
        true 
       with _ -> 
        false 
    then unprotected()
    else null

我认为最好的惯用代码是使用选项类型:

member t.MyMethod(x : string) : SomeType =
    let result =
        try
            foo()
            bar()
            Some(...)
        with :? SomeException ->
            None

    match(result)
    | Some(...) -> // do other work and return something
    | None -> // return something

怎么样:

let success =
    try
        foo ()
        bar ()
        true
    with :? SomeException ->
        false

if success then
    ...
else
    ()

好。。。你 能够 做…

type Test() =
    member this.MyMethod (x:string) =
        if try
            foo()
            bar()
            true
           with _ -> false
        then
            // do more work
            "blah"
        else
            null

或者,翻转“真/假”…

type Test() =
    member this.MyMethod (x:string) =
        if try
            foo();
            bar();
            false
           with _ -> true
        then
            // bail early
            null
        else
            // do more work
            "blah"

强烈建议从返回空值切换到返回选项类型(一些(x)/无)。让编译器捕获未处理空值的位置,而不是您的用户;-)