如何随机选择三个字符串之一？

Question

I have to create a password and I believe that I can do it, however I am stumped at the very beginning. I have 3 strings of characters, I would like to randomly select one of these three strings. Does anybody know how to do it?

  Dim sLowerCase As String = "qwertyuiopasdfghjklzxcvbnm"
        Dim sUpperCase As String = "MNBVCXZLKJHGFDSAPOIUYTREWQ"
        Dim sNumbers As String = "1234567890"

So I want to randomly select one of these three strings

Answer 1

I suggest you to use ListOf string instead for this. you can code like the following;

    Dim listofStrings As New List(Of String) ' Declaration of list of strings
    listofStrings.Add("qwertyuiopasdfghjklzxcvbnm") 'assign values to the list
    listofStrings.Add("MNBVCXZLKJHGFDSAPOIUYTREWQ")
    listofStrings.Add("1234567890")
    Dim rnd As New Random
    Dim randomString As String = listofStrings.Item(rnd.Next(0, 3))'select random string from the list

it will generate random numbers between 0 and 2 hence it will help you to select random string from the list of strings based on index referenced by the random number

Answer 2

The below code will help you generate a random number and then pick up the string at that position in the array

string[] arr= {"qwertyuiopasdfghjklzxcvbnm","MNBVCXZLKJHGFDSAPOIUYTREWQ","1234567890"};
               Random rnd = new Random();
               int cnt = rnd.Next(2);
               string r = arr[cnt];