C#手机号换成111XXXX1111 这种显示解决思路

String subStr=phone.Substring(3,4);
oldcellphone.Text = phone.Replace(subStr,"****");

 

 

/// <summary>
    /// 替换手机号中间四位为*
    /// </summary>
    /// <param name="phoneNo"></param>
    /// <returns></returns>
    protected string ReturnPhoneNO(string phoneNo)
    {              
        Regex re = new Regex("(\\d{3})(\\d{4})(\\d{4})", RegexOptions.None);
        phoneNo = re.Replace(phoneNo, "$1****$3");
        return phoneNo;
    }