[英]How to generate a string with less than / more than length
I would like to allow users to choose the exact length, or less than / more than count o characters to be generated (in a password generator).我想允许用户选择确切的长度,或者小于/大于要生成的 count 个字符(在密码生成器中)。
For example i have done:例如我做过:
// the longivity of the generated string
var stringChars = new char[int.Parse(TextBox2.Text)];
var random = new Random();
for (int i = 0; i < stringChars.Length; i++)
{
// abc has been declared before, it is simply ABCD... for character generation
stringChars[i] = abc[random.Next(abc.Length)];
}
var finalString = new String(stringChars);
// this is the result box
TextBox1.Text = finalString;
Now my problem is if user enters for eg.现在我的问题是如果用户输入例如。 10 and wants less than 10 characters of generated string, what should I do? 10 并且想要生成的字符串少于 10 个字符,我该怎么办?
You could do for example something like this (with the power of Linq):例如,您可以执行以下操作(借助 Linq 的功能):
public string GeneratePassword(string abc, int minLenght, int maxLenght)
{
var random = new Random();
var chars = Enumerable
.Range(0, random.Next(minLenght, maxLenght + 1)) // Generate a range between the min and max.
.Select(x => abc[random.Next(abc.Length)]) // Select a random character from the abc.
.ToList();
// Concatenate the string.
return string.Join(string.Empty, chars);
}
You have to using the System.Linq
你必须使用System.Linq
Usage:用法:
var input = 10;
var abc = "abcde";
var maxPasswordLength = 100;
var minPasswordLength = 1;
// More than the input.
GeneratePassword(abc, input + 1, maxPasswordLength);
// Less than the input.
GeneratePassword(abc, minPasswordLength, input - 1);
// Exact length.
GeneratePassword(abc, input, input);
public class Program
{
private const int MAX_LENGTH = 50;
static void Main(string[] args)
{
var less = GeneratedLessThan(12);
var more = GeneratedMoreThan(12);
Console.WriteLine($"Less Than : {less} ({less.Length})");
Console.WriteLine($"More Than : {more} ({more.Length})");
Console.ReadLine();
}
static char[] ABC()
{
List<char> list = new List<char>();
for (char i = 'A'; i <= 'Z'; i++)
{
list.Add(i);
}
return list.ToArray();
}
static string GeneratedLessThan(int max) => GeneratedString(0, max);
static string GeneratedMoreThan(int min) => GeneratedString(min, MAX_LENGTH);
static string GeneratedString(int min, int max)
{
StringBuilder builder = new StringBuilder();
var abc = ABC();
var rnd = new Random();
for (int i = 0; i <= rnd.Next(min, max); i++)
{
builder.Append(abc[rnd.Next(abc.Length)]);
}
return builder.ToString();
}
}
Maybe you dont need ABC function.也许你不需要 ABC 功能。
Ouput :输出:
Less Than : IORS (4)
More Than : BSVPFZVQRWZTSPYDI (17)
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