/// <summary>
/// 字符帮助类
/// </summary>
public class StringHelper
{
private static readonly Regex RegEmail = new Regex("^\\s*([A-Za-z0-9_-]+(\\.\\w+)*@([\\w-]+\\.)+\\w{2,3})\\s*$", RegexOptions.IgnoreCase); //验证邮箱正则
private static readonly Regex RegHasCHZN = new Regex("[\u4e00-\u9fa5]", RegexOptions.IgnoreCase);//验证是否含中文正则
private static readonly Regex RegCHZN = new Regex(@"^[\u4e00-\u9fa5]{1,}$", RegexOptions.IgnoreCase);//验证是否为中文正则
private static readonly Regex RegPhone = new Regex("(^(\\d{11})$|^((\\d{7,8})|(\\d{4}|\\d{3})-(\\d{7,8})|(\\d{4}|\\d{3})-(\\d{7,8})-(\\d{4}|\\d{3}|\\d{2}|\\d{1})|(\\d{7,8})-(\\d{4}|\\d{3}|\\d{2}|\\d{1}))$)", RegexOptions.IgnoreCase); //验证电话和手机号码正则
private static readonly Regex RegUrl = new Regex(@"http(s)?://([\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?",RegexOptions.IgnoreCase);//验证Url正则
private static readonly Regex RegNumber = new Regex(@"^[0-9]*$", RegexOptions.IgnoreCase);//验证纯数字l正则 #region 判断IP格式 /// <summary>
/// 判断是否是IP地址格式 0.0.0.0
/// </summary>
/// <param name="input">待判断的IP地址</param>
/// <returns>true or false</returns>
public static bool IsIPAddress(string input)
{
if (input.IsNullOrEmpty() || input.Length < || input.Length > ) return false; const string regFormat = @"^d{1,3}[.]d{1,3}[.]d{1,3}[.]d{1,3}$"; var regex = new Regex(regFormat, RegexOptions.IgnoreCase);
return regex.IsMatch(input);
} #endregion #region 判断邮箱格式 /// <summary>
/// 判断邮箱格式
/// </summary>
/// <param name="input">文本信息</param>
/// <returns>验证结果</returns>
public static bool IsEmail(string input)
{
if (input.IsNullOrEmpty())
return false;
Match m = RegEmail.Match(input);
return m.Success;
}
#endregion #region 中文字符检测 /// <summary>
/// 检测是否有中文字符
/// </summary>
/// <param name="input">文本信息</param>
/// <returns>检测结果</returns>
public static bool IsContainCHZN(string input)
{
if (input.IsNullOrEmpty())
return false;
Match m = RegHasCHZN.Match(input);
return m.Success;
}
#endregion #region 判断是否中文
/// <summary>
/// 判断参数是否为中文字符
/// </summary>
/// <param name="input">文本信息</param>
/// <returns></returns>
public static bool IsChinese(string input)
{
if (input.IsNullOrEmpty())
return false;
Match m = RegCHZN.Match(input);
return m.Success;
}
#endregion #region 判断电话号码
// 电话号码和手机号码检查
/// <summary>
/// 电话号码和手机号码检查
/// </summary>
/// <param name="input">电话号码或手机号码</param>
/// <returns>匹配结果</returns>
public static bool IsPhone(string input)
{
if (input.IsNullOrEmpty())
return false;
Match m = RegPhone.Match(input);
return m.Success;
}
#endregion #region 判断Url合法性
/// <summary>
/// 验证请求的url是否合法
/// </summary>
/// <param name="input">输入参数</param>
/// <returns></returns>
public static bool IsUrl(string input)
{
if (input.IsNullOrEmpty())
return false;
Match m = RegUrl.Match(input);
return m.Success;
}
#endregion #region 判断是否数字
/// <summary>
/// 验证参数是否为数字
/// </summary>
/// <param name="input">输入字符串</param>
/// <returns></returns>
public static bool IsNumberic(string input)
{
if (input.IsNullOrEmpty())
return false;
Match m = RegNumber.Match(input);
return m.Success;
}
#endregion #region 字符串截取
/// <summary>
/// 检查字符串最大长度，返回指定长度的串
/// </summary>
/// <param name="input">输入字符串</param>
/// <param name="maxLength">最大长度</param>
/// <returns></returns>
public static string TextSbustring(string input, int maxLength)
{
if (input.IsNullOrEmpty())
return null;
input = input.Trim();
if (input.Length > maxLength)//按最大长度截取字符串
input = input.Substring(, maxLength);
return input;
}
#endregion #region 判断是否含关键词
/// <summary>
/// 检查是否包含SQL关键字
/// </summary>
/// <param name="input">被检查的字符串</param>
/// <returns>存在SQL关键字返回true，不存在返回false</returns>
public static bool IsContainSQLKeyWord(string input)
{
if (input.IsNullOrEmpty())
return false;
string strKeyWord = @"select|insert|delete|from|count(|drop table|update|truncate|asc(|mid(|char(|xp_cmdshell|exec master|netlocalgroup administrators|:|net user|""|or|and";
string strRegex = @"[-|;|,|/|(|)|[|]|}|{|%|@|*|!|']";
if (Regex.IsMatch(input, strKeyWord, RegexOptions.IgnoreCase) || Regex.IsMatch(input, strRegex))
return true;
return false;
} /// <summary>
/// 检查是否含有关键字
/// </summary>
/// <param name="input">被检查的字符串</param>
/// <returns></returns>
public static bool IsContainKeywords(string input)
{
if (input.IsNullOrEmpty())
return false;
string sLowerStr = input.ToLower();
string sRxStr = @"(\sand\s)|(\sand\s)|(\slike\s)|(select\s)|(insert\s)|(delete\s)|(update\s[\s\S].*\sset)|(create\s)|(\stable)|(<[iframe|/iframe|script|/script])|(')|(\sexec)|(declare)|(\struncate)|(\smaster)|(\sbackup)|(\smid)|(\scount)|(cast)|(%)|(\sadd\s)|(\salter\s)|(\sdrop\s)|(\sfrom\s)|(\struncate\s)|(\sxp_cmdshell\s)";
Regex sRx = new Regex(sRxStr);
return sRx.IsMatch(sLowerStr, );
}
#endregion #region 判断是否包含空格
/// <summary>
/// 检查是否包含空格
/// </summary>
/// <param name="input">被检查的字符串</param>
/// <returns>存在空格返回true，不存在返回false</returns>
public static bool IsContainSpace(string input)
{
if (input.IsNullOrEmpty())
return false;
if (input.IndexOf(" ") >= )
return true;
else
return false;
}
#endregion
}
/// <summary>
/// 将对象转化为Int32类型
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
public static int GetInt(this object input)
{
return Convert.ToInt32(input);
}
/// <summary>
/// 将对象转化为Int64类型
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
public static long GetLong(this object input)
{
return Convert.ToInt64(input);
}
/// <summary>
/// 将对象转化为DateTime类型
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
public static DateTime GetDateTime(this object input)
{
return Convert.ToDateTime(input);
}
/// <summary>
/// 将对象转化为DateTime类型
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
public static DateTime? GetDateTimeNullable(this object input)
{
if (input == null||input.ToString().IsNullOrEmpty())
return null;
return Convert.ToDateTime(input);
}
/// <summary>
/// 将对象转化为Decimal类型
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
public static Decimal GetDecimal(this object input)
{
return Convert.ToDecimal(input);
}
/// <summary>
/// 将对象转化为Boolean类型
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
public static bool GetBool(this object input)
{
return Convert.ToBoolean(input);
}
/// <summary>
/// 字符串是否为空
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static bool IsNullOrEmpty(this string str)
{
return str == null || str == string.Empty || str == "";
}
/// <summary>
/// 字符串是否不为空
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static bool IsNotNullOrEmpty(this string str)
{
return str != null && str != string.Empty && str != "";
}
/// <summary>
/// 判断是否是大于或等于0的整数
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
public static bool IsNumeric(this string input)
{
int output = ;
return int.TryParse(input, out output);
}
/// <summary>
/// 判断是否是合法日期
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
public static bool IsDateTime(this string input)
{
DateTime tmp;
return DateTime.TryParse(input, out tmp);
}
/// <summary>
/// 判断字符串是否是Decimal
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
public static bool IsDecimal(this string input)
{
Decimal output = ;
return decimal.TryParse(input, out output);
}
/// <summary>
/// 判断对象是否是Boolean
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
public static bool IsBoolean(this string input)
{
bool output = false;
return Boolean.TryParse(input, out output);
}