How to generate unique alphanumeric max 50 character string?

Cenk

Hello,

I would like to know how to create unique alphanumeric max 50 character string. What is the chance of getting the same string by the way? I have more than one client, I don't want strings to be overlapped.

Best Regards.

3 Replies

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Mario Scheeren7y ago
Accepted answer
A really simple solution is this:
static Random _Random = new Random();
static char[] _AllowedChars =
    Enumerable.Range(48, 10).Select(x => (char)x)
    .Concat(Enumerable.Range(65, 26).Select(x => (char)x))
    .Concat(Enumerable.Range(97, 26).Select(x => (char)x))
    .ToArray();
static string PseudoUniqueString(int maxLength = 50)
    => new string(Enumerable.Range(1, Math.Max(1, maxLength))
                .Select(x => _AllowedChars[_Random.Next(_AllowedChars.Length)])
                .ToArray());
+1
Mario Scheeren7y ago
I am not good in calculating this, but if you really want to narrow it down further, you could put them in a static list, having an expiring timestamp so that you could look up values for duplicates. But actually I don't think you will get that much overlaps. You could possibly add an useralias before that also, making it even more impossible to get dups.
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Cenk7y ago
Hi Mario,

Thanks for your reply. What is the chance of generating the same string? I am planning to use this unique string for transactions in my web api.
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