using System;

/// <summary>
/// Summary description for IDCardValid
/// </summary>
public class IDCardValid
{
public IDCardValid()
{
//
// TODO: Add constructor logic here
//
}

/// <summary>
/// 驗證身份證號碼
/// </summary>
/// <param name="Id">身份證號碼</param>
/// <returns>驗證成功為True，否則為False</returns>
public static bool CheckIDCard(string Id)
{
if (Id.Length == 18)
{
bool check = CheckIDCard18(Id);
return check;
}
else if (Id.Length == 15)
{
bool check = CheckIDCard15(Id);
return check;
}
else
{
return false;
}
}
#region 身份證號碼驗證

/// <summary>
/// 驗證15位身份證號
/// </summary>
/// <param name="Id">身份證號</param>
/// <returns>驗證成功為True，否則為False</returns>
private static bool CheckIDCard18(string Id)
{
long n = 0;
if (long.TryParse(Id.Remove(17), out n) == false || n < Math.Pow(10, 16) || long.TryParse(Id.Replace('x', '0').Replace('X', '0'), out n) == false)
{
return false;//數字驗證
}
string address = "11x22x35x44x53x12x23x36x45x54x13x31x37x46x61x14x32x41x50x62x15x33x42x51x63x21x34x43x52x64x65x71x81x82x91";
if (address.IndexOf(Id.Remove(2)) == -1)
{
return false;//省份驗證
}
string birth = Id.Substring(6, 8).Insert(6, "-").Insert(4, "-");
DateTime time = new DateTime();
if (DateTime.TryParse(birth, out time) == false)
{
return false;//生日驗證
}
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(',');
char[] Ai = Id.Remove(17).ToCharArray();
int sum = 0;
for (int i = 0; i < 17; i++)
{
sum += int.Parse(Wi[i]) * int.Parse(Ai[i].ToString());
}
int y = -1;
Math.DivRem(sum, 11, out y);
if (arrVarifyCode[y] != Id.Substring(17, 1).ToLower())
{
return false;//校驗碼驗證
}
return true;//符合GB11643-1999標準
}

/// <summary>
/// 驗證18位身份證號
/// </summary>
/// <param name="Id">身份證號</param>
/// <returns>驗證成功為True，否則為False</returns>
private static bool CheckIDCard15(string Id)
{
long n = 0;
if (long.TryParse(Id, out n) == false || n < Math.Pow(10, 14))
{
return false;//數字驗證
}
string address = "11x22x35x44x53x12x23x36x45x54x13x31x37x46x61x14x32x41x50x62x15x33x42x51x63x21x34x43x52x64x65x71x81x82x91";
if (address.IndexOf(Id.Remove(2)) == -1)
{
return false;//省份驗證
}
string birth = Id.Substring(6, 6).Insert(4, "-").Insert(2, "-");
DateTime time = new DateTime();
if (DateTime.TryParse(birth, out time) == false)
{
return false;//生日驗證
}
return true;//符合15位身份證標準
}
#endregion
}