使用替代类语法在构造函数中添加代码

问题描述

type Foo = 
    class
        inherit Bar

        val _stuff : int

        new (stuff : int) = {
            inherit Bar()
            _stuff = stuff
        }
    end

我想在上面的构造函数中添加以下代码：

I want to add this code in above constructor:

if (stuff < 0) then raise (ArgumentOutOfRangeException "Stuff must be positive.")
else ()

我该如何在F＃中实现此目标？

How can I achieve this in F# ?

推荐答案

您可以执行此操作，而无需任何变通方法，但是初始左卷曲的位置非常敏感（或者解析器有错误？）。首先要做效果：

You can do this without needing any workarounds, but the placement of the initial left curly is fairly sensitive (or maybe the parser is buggy?). To do the effect first:

type Foo =
  class
    inherit Bar
    val _stuff : int
    new (stuff : int) = 
      if stuff < 0 then raise (System.ArgumentOutOfRangeException("Stuff must be positive"))
      { 
        inherit Bar() 
        _stuff = stuff 
      }
  end

第二个效果：

type Foo =
  class
    inherit Bar
    val _stuff : int
    new (stuff : int) = 
      { 
        inherit Bar() 
        _stuff = stuff 
      }
      then if stuff < 0 then raise (System.ArgumentOutOfRangeException("Stuff must be positive"))
  end

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