C#中华人民共和国身份证验证

规则见http://www.zhanglihai.com/article/2004/11/29/H176H3G0100200G0M060HE8DKUXYWJNE.html

#region 大陸身份證號碼驗證

private bool CheckIDCard_CHS(string IDCard)

{

        string[] arrVarifyCode=("1,0,x,9,8,7,6,5,4,3,2").Split(',');

        string[] Wi=("7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2").Split(',');

        string[] Checker=("1,9,8,7,6,5,4,3,2,1,1").Split(',');

        int intLength=IDCard.Length;

 

        int i=0,TotalmulAiWi=0;

        int modValue=0;

        string strVerifyCode="";

        string Ai="";

        string BirthDay="";

        int intYear=0;

        int intMonth=0;

        int intDay=0;

 

        if(intLength<15||intLength==16||intLength==17||intLength>18)

        {

                return false;

        }

        if(intLength==18)

        {

                Ai=IDCard.Substring(0,17);

        }

        else if(intLength==15)

        {

                Ai=IDCard;

                Ai=Ai.Substring(0,6)+"19"+Ai.Substring(6,9);

        }

        if(!IsNumeric(Ai))return false;

 

        intYear=Convert.ToInt32(Ai.Substring(6,4));

        intMonth=Convert.ToInt32(Ai.Substring(10,2));

        intDay=Convert.ToInt32(Ai.Substring(12,2));

 

        BirthDay=intYear.ToString()+"-"+intMonth.ToString()+"-"+intDay.ToString();

        if(IsDateTime(BirthDay))

        {

                DateTime DateBirthDay=DateTime.Parse(BirthDay);

                if(DateBirthDay>DateTime.Now)

                {

                        return false;

                }

 

                int intYearLength=DateBirthDay.Year-DateBirthDay.Year;

                if(intYearLength<-140)

                {

                        return false;

                }

        }

 

        if(intMonth>12||intDay>31)

        {

                return false;

        }

 

        for(i=0;i<17;i++)

        {

                TotalmulAiWi=TotalmulAiWi+(Convert.ToInt32(Ai.Substring(i,1))*Convert.ToInt32(Wi[i].ToString()));

        }

        modValue=TotalmulAiWi % 11;

 

        strVerifyCode=arrVarifyCode[modValue].ToString();

        Ai=Ai + strVerifyCode;

        if(intLength==18&&IDCard!=Ai)

        {

                return false;

        }

        return true;

}

#endregion

/// <summary>

/// 判斷字符串是否可轉換為DateTime

/// </summary>

/// <param name="s">要判斷的字符串</param>

/// <returns>true=可以轉換;false=無法轉換</returns>

private bool IsDateTime(string s)

{ 

        try

        {

                System.DateTime.Parse(s);

        } 

        catch

        {

                return   false;

        }

        return true; 

}

 

/// <summary>

/// 判斷字符串是否可以轉換為數字

/// </summary>

/// <param name="value">要判斷的字符串</param>

/// <returns>true=可以轉換;false=無法轉換</returns>

private bool IsNumeric(object value)

{

        try

        {

                double i = Convert.ToDouble (value.ToString());

                return true;

        }

        catch (FormatException)

        {

                return false;

        }

}