从列表中选择任何随机字符串 [英] Select any random string from a list

问题描述

如何从给定的字符串列表中选择任何随机字符串?示例:

How can I select any random string from a given list of strings? Example:

List1: banana, apple, pineapple, mango, dragon-fruit
List2: 10.2.0.212, 10.4.0.221, 10.2.0.223

当我调用诸如 randomize(List1) = somevar 之类的函数时，它只会从该特定列表中获取任何字符串.somevar 中的结果将是完全随机的.怎么做到呢?非常感谢:)

When I call some function like randomize(List1) = somevar then it will just take any string from that particular list. The result in somevar will be totally random. How can it be done? Thank you very much :)

推荐答案

使用 随机

Dim rnd = new Random()
Dim randomFruit = List1(rnd.Next(0, List1.Count))

请注意，如果要在循环中执行此代码，则必须重用随机实例.否则这些值会重复，因为 random 是用当前时间戳初始化的.

Note that you have to reuse the random instance if you want to execute this code in a loop. Otherwise the values would be repeating since random is initialized with the current timestamp.

所以这是有效的:

Dim rnd = new Random()
For i As Int32 = 1 To 10
    Dim randomFruit = List1(rnd.Next(0, List1.Count))
    Console.WriteLine(randomFruit)
Next

因为总是使用相同的随机实例.

since always the same random instance is used.

但这行不通:

For i As Int32 = 1 To 10
    Dim rnd = new Random()
    Dim randomFruit = List1(rnd.Next(0, List1.Count))
    Console.WriteLine(randomFruit)
Next

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