C# 手机号码隐藏中间四位

C# 隐藏手机号码中间四位数字

1. 使用正则表达式隐藏手机号中间四位

        if (!string.IsNullOrWhiteSpace(txtPhone.Text) &&
                txtPhone.Text.Length == 11)
            {
                txtPhoneDesendent.Text = Regex.Replace(txtPhone.Text, "(\\d{3})\\d{4}(\\d{4})", "$1****$2");
            }

2. 字符串判断处理

           /// <summary>
           /// 手机号脱敏
           /// </summary>
           /// <param name="phoneNo"></param>
           /// <returns></returns>
           private string ConvertPhonedNo(string phoneNo)
           {
               if (string.IsNullOrEmpty(phoneNo))
                   return phoneNo;
               if (phoneNo.Length < 11)
               {
                   return phoneNo;
               }
               StringBuilder sb = new StringBuilder(phoneNo.Substring(0, 3));
               for (int i = 0; i < phoneNo.Length - 5; i++)
               {
                   sb.Append('*');
               }
               sb.Append(phoneNo.Substring(phoneNo.Length - 2));
               return sb.ToString();
           }