如何在C＃中创建值生成器ala十六进制

Question

I would like to create unique value generator that would work like this: I have 8 places for chars and it would create values like this:

00000001 . 0000000z . 00000010 . 0000001z

etc. so it would create values from 00000001 to zzzzzzzz.

I have only 8 places because this is the size of the field in the database and I can't change it.

Thanks in advance

Answer 1

使用bultin random（）函数，然后在完成后将结果转换为十六进制。

Answer 2

Are you sure you're not looking for a GUID?

Same number of chars, different structure: 550e8400-e29b-41d4-a716-446655440000 You can create a new GUID:

System.Guid.NewGuid().ToString(""N"")

Split it every 8 chars and append a dot, like this:

string getUnique()
{
    char[] initial = System.Guid.NewGuid().ToString("N").ToCharArray();
    string result="";

    for(int i=0; i<initial.Count(); i++){
        result=result + initial[i];
        if((i+1)%4==0 && (i+1)!=initial.Count()){
            result = result + ".";
        }
    }
    return result;
}

Answer 3

something like this

public class UniqueKeyMaker
{
    private int[] keys = new int[8];

    public void Reset()
    {
        for (int i = 0; i < keys.Length; i++)
            keys[i] = 0;
    }

    public string NextKey()
    {       
        string key = getCurrentKey();
        increment();
        return key;
    }

    private void increment()
    {
        int i = 7;
        while (keys[i] == 35)
        {
            keys[i] = 0;
            i--;
        }

        keys[i]++;
    }

    private string getCurrentKey()
    {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < 8; i++)
        {
            if (keys[i] < 10)
                sb.Append((char)(keys[i] + (int)'0'));
            else
                sb.Append((char)(keys[i] - 10 + (int)'a'));
        }
        return sb.ToString();
    }
}

Answer 4

You just want to encode an int into a base 36 system. This might work like like following(probably has a few small mistakes since it's notepad code):

string IntToID(long id)
{
    string result="";
    Contract.Require(id>=0);
    while(id>0)
    {
       int digit=id%36;
       char digitChar;
       if(digit<10)
         digitChar='0'+digit;
       else
         digitChar='a'+(digit-10);
       result+=digitChar;
       id/=36;
    }
    result=result.PadLeft('0',8);
    return result;
}