获取IP的字符串 ：HttpContext.Current.Request.UserHostAddress
/// <summary>
/// 是否为ip
/// </summary>
/// <param name="ip"></param>
/// <returns></returns>
public static bool IsIP（string ip）
{
return Regex.IsMatch（HttpContext.Current.Request.UserHostAddress, @"^（（2[0-4]\d|25[0-5]|[01]?\d\d?）\.）{3}（2[0-4]\d|25[0-5]|[01]?\d\d?）$"）;
}
public static bool IsIPSect（string ip）
{
return Regex.IsMatch（HttpContext.Current.Request.UserHostAddress, @"^（（2[0-4]\d|25[0-5]|[01]?\d\d?）\.）{2}（（2[0-4]\d|25[0-5]|[01]?\d\d?|\*）\.）（2[0-4]\d|25[0-5]|[01]?\d\d?|\*）$"）;
}
/// <summary>
/// 判断字符串是否是yy-mm-dd字符串
/// </summary>
/// <param name="str">待判断字符串</param>
/// <returns>判断结果</returns>
public static bool IsDateString（string str）
{
return Regex.IsMatch（str, @"（\d{4}）-（\d{1,2}）-（\d{1,2}）"）;
}
