1 /// <summary>
2 /// 字符帮助类
3 /// </summary>
4 public class StringHelper
5 {
6 private static readonly Regex RegEmail = new Regex("^\\s*([A-Za-z0-9_-]+(\\.\\w+)*@([\\w-]+\\.)+\\w{2,3})\\s*$", RegexOptions.IgnoreCase); //验证邮箱正则
7 private static readonly Regex RegHasCHZN = new Regex("[\u4e00-\u9fa5]", RegexOptions.IgnoreCase);//验证是否含中文正则
8 private static readonly Regex RegCHZN = new Regex(@"^[\u4e00-\u9fa5]{1,}$", RegexOptions.IgnoreCase);//验证是否为中文正则
9 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
10 private static readonly Regex RegUrl = new Regex(@"http(s)?://([\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?",RegexOptions.IgnoreCase);//验证Url正则
11 private static readonly Regex RegNumber = new Regex(@"^[0-9]*$", RegexOptions.IgnoreCase);//验证纯数字l正则
12
13 #region 判断IP格式
14
15 /// <summary>
16 /// 判断是否是IP地址格式 0.0.0.0
17 /// </summary>
18 /// <param name="input">待判断的IP地址</param>
19 /// <returns>true or false</returns>
20 public static bool IsIPAddress(string input)
21 {
22 if (input.IsNullOrEmpty() || input.Length < 7 || input.Length > 15) return false;
23
24 const string regFormat = @"^d{1,3}[.]d{1,3}[.]d{1,3}[.]d{1,3}$";
25
26 var regex = new Regex(regFormat, RegexOptions.IgnoreCase);
27 return regex.IsMatch(input);
28 }
29
30 #endregion
31
32 #region 判断邮箱格式
33
34 /// <summary>
35 /// 判断邮箱格式
36 /// </summary>
37 /// <param name="input">文本信息</param>
38 /// <returns>验证结果</returns>
39 public static bool IsEmail(string input)
40 {
41 if (input.IsNullOrEmpty())
42 return false;
43 Match m = RegEmail.Match(input);
44 return m.Success;
45 }
46 #endregion
47
48 #region 中文字符检测
49
50 /// <summary>
51 /// 检测是否有中文字符
52 /// </summary>
53 /// <param name="input">文本信息</param>
54 /// <returns>检测结果</returns>
55 public static bool IsContainCHZN(string input)
56 {
57 if (input.IsNullOrEmpty())
58 return false;
59 Match m = RegHasCHZN.Match(input);
60 return m.Success;
61 }
62 #endregion
63
64 #region 判断是否中文
65 /// <summary>
66 /// 判断参数是否为中文字符
67 /// </summary>
68 /// <param name="input">文本信息</param>
69 /// <returns></returns>
70 public static bool IsChinese(string input)
71 {
72 if (input.IsNullOrEmpty())
73 return false;
74 Match m = RegCHZN.Match(input);
75 return m.Success;
76 }
77 #endregion
78
79 #region 判断电话号码
80 // 电话号码和手机号码检查
81 /// <summary>
82 /// 电话号码和手机号码检查
83 /// </summary>
84 /// <param name="input">电话号码或手机号码</param>
85 /// <returns>匹配结果</returns>
86 public static bool IsPhone(string input)
87 {
88 if (input.IsNullOrEmpty())
89 return false;
90 Match m = RegPhone.Match(input);
91 return m.Success;
92 }
93 #endregion
94
95 #region 判断Url合法性
96 /// <summary>
97 /// 验证请求的url是否合法
98 /// </summary>
99 /// <param name="input">输入参数</param>
100 /// <returns></returns>
101 public static bool IsUrl(string input)
102 {
103 if (input.IsNullOrEmpty())
104 return false;
105 Match m = RegUrl.Match(input);
106 return m.Success;
107 }
108 #endregion
109
110 #region 判断是否数字
111 /// <summary>
112 /// 验证参数是否为数字
113 /// </summary>
114 /// <param name="input">输入字符串</param>
115 /// <returns></returns>
116 public static bool IsNumberic(string input)
117 {
118 if (input.IsNullOrEmpty())
119 return false;
120 Match m = RegNumber.Match(input);
121 return m.Success;
122 }
123 #endregion
124
125 #region 字符串截取
126 /// <summary>
127 /// 检查字符串最大长度，返回指定长度的串
128 /// </summary>
129 /// <param name="input">输入字符串</param>
130 /// <param name="maxLength">最大长度</param>
131 /// <returns></returns>
132 public static string TextSbustring(string input, int maxLength)
133 {
134 if (input.IsNullOrEmpty())
135 return null;
136 input = input.Trim();
137 if (input.Length > maxLength)//按最大长度截取字符串
138 input = input.Substring(0, maxLength);
139 return input;
140 }
141 #endregion
142
143 #region 判断是否含关键词
144 /// <summary>
145 /// 检查是否包含SQL关键字
146 /// </summary>
147 /// <param name="input">被检查的字符串</param>
148 /// <returns>存在SQL关键字返回true，不存在返回false</returns>
149 public static bool IsContainSQLKeyWord(string input)
150 {
151 if (input.IsNullOrEmpty())
152 return false;
153 string strKeyWord = @"select|insert|delete|from|count(|drop table|update|truncate|asc(|mid(|char(|xp_cmdshell|exec master|netlocalgroup administrators|:|net user|""|or|and";
154 string strRegex = @"[-|;|,|/|(|)|[|]|}|{|%|@|*|!|']";
155 if (Regex.IsMatch(input, strKeyWord, RegexOptions.IgnoreCase) || Regex.IsMatch(input, strRegex))
156 return true;
157 return false;
158 }
159
160 /// <summary>
161 /// 检查是否含有关键字
162 /// </summary>
163 /// <param name="input">被检查的字符串</param>
164 /// <returns></returns>
165 public static bool IsContainKeywords(string input)
166 {
167 if (input.IsNullOrEmpty())
168 return false;
169 string sLowerStr = input.ToLower();
170 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)";
171 Regex sRx = new Regex(sRxStr);
172 return sRx.IsMatch(sLowerStr, 0);
173 }
174 #endregion
175
176 #region 判断是否包含空格
177 /// <summary>
178 /// 检查是否包含空格
179 /// </summary>
180 /// <param name="input">被检查的字符串</param>
181 /// <returns>存在空格返回true，不存在返回false</returns>
182 public static bool IsContainSpace(string input)
183 {
184 if (input.IsNullOrEmpty())
185 return false;
186 if (input.IndexOf(" ") >= 0)
187 return true;
188 else
189 return false;
190 }
191 #endregion
192 }
/// <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 = 0;
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 = 0;
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);
}
