常用函数集介绍

/// <summary>
/// 检验日期格式是否正确
/// </summary>
#region public string IsDateFormat(string strDate)
public string IsDateFormat(string strDate)
{
strDate = strDate.Trim();

Regex r1 = new Regex(@"^(?<year>[1-9][0-9]{0,3})/(?<month>[0-9]{1,2})/(?<day>[0-9]{1,2})$");
Regex r2 = new Regex(@"^(?<year>[1-9][0-9]{0,3})-(?<month>[0-9]{1,2})-(?<day>[0-9]{1,2})$");
Regex r3 = new Regex(@"^(?<year>[1-9][0-9]{0,3})年(?<month>[0-9]{1,2})月(?<day>[0-9]{1,2})日$");
Regex r4 = new Regex(@"^(?<month>[0-9]{1,2})/(?<day>[0-9]{1,2})/(?<year>[1-9][0-9]{0,3})$");

// 取得日期的年，月，日
string year, month, date;

if(Regex.IsMatch(strDate,@"^(?<month>[0-9]{1,2})/(?<day>[0-9]{1,2})/(?<year>[1-9][0-9]{3})$"))
{
year = r4.Match(strDate).Result("${year}");
month = r4.Match(strDate).Result("${month}");
date = r4.Match(strDate).Result("${day}");
}
else if (Regex.IsMatch(strDate,@"^(?<year>[1-9][0-9]{0,3})/(?<month>[0-9]{1,2})/(?<day>[0-9]{1,2})$"))
{
year = r1.Match(strDate).Result("${year}");
month = r1.Match(strDate).Result("${month}");
date = r1.Match(strDate).Result("${day}");
}
else if(Regex.IsMatch(strDate,@"^(?<year>[1-9][0-9]{0,3})-(?<month>[0-9]{1,2})-(?<day>[0-9]{1,2})$"))
{
year = r2.Match(strDate).Result("${year}");
month = r2.Match(strDate).Result("${month}");
date = r2.Match(strDate).Result("${day}");
}
else if(Regex.IsMatch(strDate,@"^(?<year>[1-9][0-9]{0,3})年(?<month>[0-9]{1,2})月(?<day>[0-9]{1,2})日$"))
{
year = r3.Match(strDate).Result("${year}");
month = r3.Match(strDate).Result("${month}");
date = r3.Match(strDate).Result("${day}");
}
else
{
return "error";
}

// 最后检查日期的正确性
try
{
System.DateTime dt = new DateTime(Convert.ToInt32(year), Convert.ToInt32(month), Convert.ToInt32(date));
return dt.ToString("yyyy-MM-dd");
}
catch
{
return "error";
}
}
#endregion

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/// <summary>
/// 检验Email字符串格式是否正确
/// </summary>
#region public bool IsEmailFormat(string strEmail)
public bool IsEmailFormat(string strEmail)
{
return Regex.IsMatch(strEmail, @"^([/w-/.]+)@((/[[0-9]{1,3}/.[0-9]{1,3}/.[0-9]{1,3}/.)|(([/w-]+/.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(/]?)$");
}
#endregion

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/// <summary>
/// 转换十五位身份证为十八位的函数。
/// </summary>
#region public string ConvertIDCard15to18(string strTemp)
public string ConvertIDCard15to18(string strTemp)
{
int[] arrInt = new int[]{7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2};
string arrCh="10X98765432";
int nTemp = 0;
if(strTemp.Length==15)
{
strTemp = strTemp.Substring(0,6) + "19" + strTemp.Substring(6,strTemp.Length-6);
for(int i = 0; i < strTemp.Length; i++)
{
nTemp += int.Parse(strTemp.Substring(i, 1).ToString()) * arrInt[i];
}
strTemp += arrCh[nTemp % 11];
}
char dd=arrCh[nTemp % 11];
return strTemp;
}
#endregion

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下在为判断ASCII码的函数组，仅支持中英文

/// <summary>
/// 是否为双字节字符。
/// </summary>
public static bool IsTwoBytesChar(char chr)
{
string str =chr.ToString();
// 使用中文支持编码
Encoding ecode = Encoding.GetEncoding("GB18030");
if (ecode.GetByteCount(str) == 2)
{
return true;
}
else
{
return false;
}
}

/// <summary>
/// 得到字符的ASCII码
/// </summary>
public static int ASCII(char chr)
{
Encoding ecode = Encoding.GetEncoding("GB18030");
Byte[] codeBytes = ecode.GetBytes(chr.ToString());
if ( IsTwoBytesChar(chr) )
{
// 双字节码为高位乘256，再加低位
// 该为无符号码，再减65536
return (int)codeBytes[0] * 256 + (int)codeBytes[1] - 65536;
}
else
{
return (int)codeBytes[0];
}
}

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