如何在c＃中将中间4信用卡号转换为xxxx？ [英] how to convert middle 4 credit card no to xxxx in c#?

问题描述

如何在c＃中将中间4信用卡号转换为xxxx？

how to convert middle 4 credit card no to xxxx in c#?

推荐答案

试试这个：

Try this:

string carditCardNumber = "4477468697203003";
            int halfPoint = carditCardNumber.Length / 2;
            string carditCard = carditCardNumber.Substring((halfPoint - 2), 4);
            string updateCarditCardNumber = carditCardNumber.Replace(carditCard, "xxxx");
            Response.Write(updateCarditCardNumber);

试试这个..

Try this..

string creditcardno = "1234567891011125";
        List<char> temp = creditcardno.ToList();

        int which4ToBeMadeasXXX = 4;
        int end = (which4ToBeMadeasXXX) * 4;
        int start = end - 4;

        for (int i = start; i < end; i++)
            temp[i] = 'X';


        creditcardno = string.Join("", temp);

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