C # Generate Promotion invitation code

Requirements Description

1 Generate a unique invitation code according to the user ID;

2) The user ID is pushed back according to the invitation code;

Main steps

1 Set the invitation code number Len, custom random sequence string sourcecode, user ID;

Note: The random sequence string increases its security, excluding the complement "0" and the confusing "i,o" in SourceCode;

2 The user ID is converted into 16;

3) to the converted string high up to complement 0;

4 the interval inserts the random character;

Code implementation

Using System; Namespace Invitedcode {class Program {static void Main (string[] args) {int len = 10    ; Code even digit//custom scrambled string, ' 0-9-A-Z ', excluding easily confused characters ' i,o ', excluding high-level complement ' 0 ' string sourcecode = ' Mwx89fcdg3j2rs1tuklyze5     
            V67HQA4BNP ";      int uid = 12345;
            User ID String code = Createcode (Len,sourcecode, UID);

            String decode = decode (code);
            Console.WriteLine (code);

            Console.WriteLine (decode);
        Console.readkey ();
            private static string Decode (string code) {//extract user ID string str = "";
            String uid = ""; for (int i = 0; i < code. Length; i + + 2) {str = code.
            Substring (i, 1); //Remove high 0 for (int i = 0; i < str.) Length; i++) {if (!STR). Substring (i, 1). Equals ("0")) {str = str. Substring (i, str.)
                    LENGTH-I);
                Break The UID = Convert.ToInt32 (str, 16).

            ToString ();
        return UID;
            private static string Createcode (int len, string sourcecode, int uid) {//decimal turn hexadecimal

            String hexid = Convert.ToString (uid,16);

            High up 0 String str = ""; for (int i = LEN/2 i > Hexid.) Length;
            i--) {str = "0";

            STR + + Hexid;
            Insert Random character Random ran = new Random (); for (int i = 1; i < Str. length+1; i + 2) {str = str. Insert (i, sourcecode. Substring (ran. Next (0, SourceCode.
            Length-1), 1);
        return str;
 }
    }
}