当前文件路径：AcomStore/Components/StrHelper.cs 
1
using System;
2using System.Drawing;
3using System.Web;
4using System.Web.UI;
5using System.Web.UI.WebControls;
6using System.Text.RegularExpressions;
7using System.IO;
8using System.Drawing.Imaging;
9using System.Text;
10using System.Web.Security;
11using System.Net;
12using System.Collections;
13//该源码下载自www.51aspx.com(５１ａｓｐｘ．ｃｏｍ)
14
15using AcomLb.Components;
16
17namespace AcomLb.Components
18
...{
19
public class StrHelper
20
...{
21 private static string passWord; //加密字符串
22
23 /**//// <summary>
24 /// 判断输入是否数字
25 /// </summary>
26 /// <param name="num">要判断的字符串</param>
27
/// <returns></returns>
28 static public bool VldInt(string num)
29 ...{
30 ...#region
31 int ResultNum;
32 return int.TryParse(num, out ResultNum);
33 #endregion
34 }
35
36 /**//// <summary>
37 /// 返回文本编辑器替换后的字符串
38 /// </summary>
39 /// <param name="str">要替换的字符串</param>
40 /// <returns></returns>
41 static public string GetHtmlEditReplace(string str)
42 ...{
43 ...#region
44 return str.Replace("'", "’").Replace(" ", " ").Replace(",", "，").Replace("%", "％").
45 Replace("script", "").Replace(".js", "");
46 #endregion
47 }
48
49 /**//// <summary>
50 /// 截取字符串函数
51 /// </summary>
52 /// <param name="str">所要截取的字符串</param>
53 /// <param name="num">截取字符串的长度</param>
54 /// <returns></returns>
55 static public string GetSubString(string str, int num)
56 ...{
57 ...#region
58 return (str.Length > num) ? str.Substring(0, num) + "..." : str;
59 #endregion
60 }
61
62 /**//// <summary>
63 /// 截取字符串优化版
64 /// </summary>
65 /// <param name="stringToSub">所要截取的字符串</param>
66 /// <param name="length">截取字符串的长度</param>
67 /// <returns></returns>
68 public static string GetFirstString(string stringToSub, int length)
69 ...{
70 ...#region
71 Regex regex = new Regex("[\u4e00-\u9fa5]+", RegexOptions.Compiled);
72 char[] stringChar = stringToSub.ToCharArray();
73 StringBuilder sb = new StringBuilder();
74 int nLength = 0;
75 bool isCut = false;
76 for (int i = 0; i < stringChar.Length; i++)
77 ...{
78 if (regex.IsMatch((stringChar[i]).ToString()))
79 ...{
80 sb.Append(stringChar[i]);
81 nLength += 2;
82 }
83 else
84 ...{
85 sb.Append(stringChar[i]);
86 nLength = nLength + 1;
87 }
88
89 if (nLength > length)
90 ...{
91 isCut = true;
92 break;
93 }
94 }
95 if (isCut)
96 return sb.ToString() + "..";
97 else
98 return sb.ToString();
99 #endregion
100 }
101
102 /**//// <summary>
103 /// 过滤输入信息
104 /// </summary>
105 /// <param name="text">内容</param>
106 /// <param name="maxLength">最大长度</param>
107 /// <returns></returns>
108 public static string InputText(string text, int maxLength)
109 ...{
110 ...#region
111 text = text.Trim();
112 if (string.IsNullOrEmpty(text))
113 return string.Empty;
114 if (text.Length > maxLength)
115 text = text.Substring(0, maxLength);
116 text = Regex.Replace(text, "[\\s]{2,}", " "); //two or more spaces
117 text = Regex.Replace(text, "(<[b|B][r|R]/*>)+|(<[p|P](.|\\n)*?>)", "\n"); //<br>
118 text = Regex.Replace(text, "(\\s*&[n|N][b|B][s|S][p|P];\\s*)+", " "); //
119 text = Regex.Replace(text, "<(.|\\n)*?>", string.Empty); //any other tags
120 text = text.Replace("'", "''");
121 return text;
122 #endregion
123 }
124
125 /**//// <summary>
126 /// 生成随机数
127 /// </summary>
128 /// <returns></returns>
129 private string GenerateCheckCode()
130 ...{
131 ...#region
132 int number;
133 char code;
134 string checkCode = String.Empty;
135
136 System.Random random = new Random();
137
138 for (int i = 0; i < 5; i++)
139 ...{
140 number = random.Next();
141
142 if (number % 2 == 0)
143 code = (char)('0' + (char)(number % 10));
144 else
145 code = (char)('A' + (char)(number % 26));
146
147 checkCode += code.ToString();
148 }
149
150 HttpContext.Current.Response.Cookies.Add(new HttpCookie("CheckCode", checkCode));
151
152 return checkCode;
153 #endregion
154 }
155
156
157 /**//// <summary>
158 /// 生成验证码图片
159 /// </summary>
160 public void CreateCheckCodeImage()
161 ...{
162 ...#region
163 string checkCode = GenerateCheckCode();
164 if (checkCode == null || checkCode.Trim() == String.Empty)
165 return;
166
167 System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22);
168 Graphics g = Graphics.FromImage(image);
169
170 try
171 ...{
172 //生成随机生成器
173 Random random = new Random();
174
175 //清空图片背景色
176 g.Clear(Color.White);
177
178 //画图片的背景噪音线
179 for (int i = 0; i < 25; i++)
180 ...{
181 int x1 = random.Next(image.Width);
182 int x2 = random.Next(image.Width);
183 int y1 = random.Next(image.Height);
184 int y2 = random.Next(image.Height);
185
186 g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
187 }
188
189 Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
190 System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
191 g.DrawString(checkCode, font, brush, 2, 2);
192
193 //画图片的前景噪音点
194 for (int i = 0; i < 150; i++)
195 ...{
196 int x = random.Next(image.Width);
197 int y = random.Next(image.Height);
198
199 image.SetPixel(x, y, Color.FromArgb(random.Next()));
200 }
201
202 //画图片的边框线
203 g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
204
205 System.IO.MemoryStream ms = new System.IO.MemoryStream();
206 image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
207 HttpContext.Current.Response.ClearContent();
208 HttpContext.Current.Response.ContentType = "image/Gif";
209 HttpContext.Current.Response.BinaryWrite(ms.ToArray());
210 }
211 finally
212 ...{
213 g.Dispose();
214 image.Dispose();
215 }
216 #endregion
217 }
218
219 生成指定位数随机数#region 生成指定位数随机数
220 private static char[] constant =
221 ...{
222 '0','1','2','3','4','5','6','7','8','9',
223 'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',
224 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'
225 };
226
227 public static string GenerateRandom(int Length)
228 ...{
229 System.Text.StringBuilder newRandom = new System.Text.StringBuilder(62);
230 Random rd = new Random();
231 for (int i = 0; i < Length; i++)
232 ...{
233 newRandom.Append(constant[rd.Next(62)]);
234 }
235 return newRandom.ToString();
236 }
237
238 public static string GetNumRandom(int Length)
239 ...{
240 System.Text.StringBuilder newRandom = new System.Text.StringBuilder(10);
241 char[] NumStr=...{'0','1','2','3','4','5','6','7','8','9'};
242 Random rd = new Random();
243 for (int i = 0; i < Length; i++)
244 ...{
245 newRandom.Append(constant[rd.Next(10)]);
246 }
247 return newRandom.ToString();
248 }
249 #endregion
250
251 /**//// <summary>
252 /// 获取汉字第一个拼音
253 /// </summary>
