获取F#中的随机数 [英] Get random numbers in F#

问题描述

我在F#中具有以下功能:

I have the following function in F#:

let randomCh () = 
        let random = Random()
        alph.Chars (random.Next (alph.Length - 1));

此函数每次都返回相同的值.我在C#中遇到了同样的问题，解决方法非常简单:仅创建一个Random对象，如下所示:

This function returns same value each time. I had same problem in C#, and solution very simple: create just one Random object like this:

    var rnd = new Random();

    for (int i = 0; i < 10; i++)
        Console.WriteLine(rnd.Next(10));

如何在F#中达到相同的行为:获取每次随机值?

How can I reach same behaviour in F#: get each time random value?

推荐答案

C#代码没有定义函数，而F#却定义了函数.您可能在C#中遇到相同的问题.您应该从randomCh函数中重构random定义，或者在初始化random之后将randomCh绑定到函数:

Well your C# code doesn't define a function whereas your F# does; you could have the same problem in C#. You should either refactor your random definition out of the randomCh function, or bind randomCh to a function after initializing random:

let alph = "abcdefg"

let randomCh = 
    let random = Random()
    fun () -> alph.Chars (random.Next (alph.Length - 1))

printfn "%O" <| randomCh()
printfn "%O" <| randomCh()

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