如何生成在C＃中的优惠券代码？

问题描述

我需要生成一个优惠券代码[5〜10位]仅一次使用。什么是生成并检查所使用的最佳方法

I need to generate a voucher code[ 5 to 10 digit] for one time use only. what is the best way to generate and check if been used?

编辑：？我宁愿字母数字字符 - 亚马逊样的礼品券代码必须是唯一的

edited: I would prefer alpha-numeric characters - amazon like gift voucher codes that must be unique.

推荐答案

在生成优惠券代码 - 你应该考虑有一个序列是可以预见的是你要真的是。

When generating voucher codes - you should consider whether having a sequence which is predictable is really what you want.

例如，优惠券代码：ABC101，ABC102，ABC103等都是相当的可预见性。用户可以很轻易地猜到优惠券代码。

For example, Voucher Codes: ABC101, ABC102, ABC103 etc are fairly predictable. A user could quite easily guess voucher codes.

要防止这一点 - 你需要防止随机猜测，从工作的一些方法。

To protect against this - you need some way of preventing random guesses from working.

有两种方法：

• 嵌入您的优惠券代码校验。

• Embed a checksum in your voucher codes.

信用卡上的最后一个数字是校验（校验位） - 当你以某种方式加起来的对方号码，可以让你确保有人输入的数字正确。请参阅：（第一链接出谷歌）为如何为信用卡完成。

The last number on a credit card is a checksum (Check digit) - when you add up the other numbers in a certain way, lets you ensure someone has entered a number correctly. See: http://www.beachnet.com/~hstiles/cardtype.html (first link out of google) for how this is done for credit cards.

有一个大的密钥空间，这只是人烟稀少。

Have a large key-space, that is only sparsely populated.

例如，如果要生成凭证1000 - 然后1,000,000关键空间意味着你应该能够使用随机生成（有重复和顺序检查），以确保它是很难猜测另一个券代码。

For example, if you want to generate 1,000 vouchers - then a key-space of 1,000,000 means you should be able to use random-generation (with duplicate and sequential checking) to ensure it's difficult to guess another voucher code.

下面是一个使用的大型骨干空间方法一个示例应用程序：

Here's a sample app using the large key-space approach:

    static Random random = new Random();

    static void Main(string[] args)
    {
        int vouchersToGenerate = 10;
        int lengthOfVoucher = 10; 


        List<string> generatedVouchers = new List<string>();
        char[] keys = "ABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890".ToCharArray();


        Console.WriteLine("Vouchers: ");
        while(generatedVouchers.Count < vouchersToGenerate)
        {
            var voucher = GenerateVoucher(keys, lengthOfVoucher); 
            if (!generatedVouchers.Contains(voucher))
            {
                generatedVouchers.Add(voucher);
                Console.WriteLine("\t[#{0}] {1}", generatedVouchers.Count, voucher);
            }
        }

        Console.WriteLine("done");

        Console.ReadLine();
    }

    private static string GenerateVoucher(char[] keys, int lengthOfVoucher)
    {
        return Enumerable
            .Range(1, lengthOfVoucher) // for(i.. ) 
            .Select(k => keys[random.Next(0, keys.Length - 1)])  // generate a new random char 
            .Aggregate("", (e, c) => e + c); // join into a string
    }

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