做 ASP.NET 程序的时候，常常要重复许多代码，如果把它们抽取出来，能极大的提高开发效率，整理了一些自己常用的代码，算法贴出来，以后再补充。
1 using System;
2 using System.Web.Security;
3
4 /// <summary>
5 ///
6 /// ** asp.net(C#) 常用代码 **
7 ///
8 /// File: Common.cs
9 ///
10 /// Author: 周振兴 (Zxjay 飘遥)
11 ///
12 /// E-Mail: tda7264@163.com
13 ///
14 /// Date: 07-05-19
15 ///
16 /// http://www.cnblogs.com/zxjay
17 ///
18 /// </summary>
19 public class Common
20 {
21 private static string CurrentUser = string.Empty;
22
23 /// <summary>
24 /// ASP.NET 常用算法
25 /// </summary>
26 public Common()
27 {
28 }
29
30 /// <summary>
31 /// 获取或设置当前用户名称
32 /// </summary>
33 public static string GetCurrentUser
34 {
35 set { CurrentUser = value; }
36 get { return CurrentUser; }
37 }
38
39 /// <summary>
40 /// 限制字符串长度,清除特殊字符
41 /// </summary>
42 /// <param name="str"> 待处理的字符串 </param>
43 /// <param name="maxlength"> 最大长度 </param>
44 /// <returns> 处理后的字符串 </returns>
45 public static string ClearString(string str,int maxlength)
46 {
47 if (string.IsNullOrEmpty(str))
48 {
49 return string.Empty;
50 }
51 str=str.Trim();
52 if(str==string.Empty)
53 {
54 return string.Empty;
55 }
56 if(str.Length>maxlength)
57 {
58 str=str.Substring(0,maxlength);
59 }
60 str=str.Replace("'","''");
61 return str;
62 }
63
64 /// <summary>
65 /// 密码字符串散列加密( MD5算法 )
66 /// </summary>
67 /// <param name="inputstr"> 待加密的字符串 </param>
68 /// <returns> 加密后字符串 </returns>
69 public static string MD5(string inputstr)
70 {
71 return FormsAuthentication.HashPasswordForStoringInConfigFile
(inputstr, "MD5").ToLower().Substring(0, 15);
72 }
73
74 /// <summary>
75 /// 插入Flash或图像
76 /// </summary>
77 /// <param name="filename"> 媒体文件名称 </param>
78 /// <param name="width"> 宽度 </param>
79 /// <param name="height"> 高度 </param>
80 /// <returns> 能展示媒体的 HTML 代码 </returns>
81 public static string ShowMedia(string filename, int width, int height)
82 {
83 string fname = filename.Trim();
84 if (filename == string.Empty)
85 {
86 return string.Empty;
87 }
88
89 string fileext = fname.Substring(fname.LastIndexOf("."));
90 //flash文件
91 if (fileext.ToLower() == ".swf")
92 {
93 string swfObject = @"<object classid='clsid:D27CDB6E-AE6D-11cf-96B8-444553540000'
codebase='http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,19,0' width='" + width + @"' height='" + height + @"'>
94 <param name='movie' value='" + filename + @"' />
95 <param name='quality' value='high' />
96 <param name='wmode' value='transparent'>
97 <embed src='" + filename + @"' quality='high'
pluginspage='http://www.macromedia.com/go/getflashplayer' type='application/x-shockwave-flash'
width='" + width + @"' height='" + height + @"'></embed>
98 </object> ";
99 return swfObject;
100 }
101 //图像文件
102 else
103 {
104 string imgObject = @"<img alt='' width='" + width + @"px' height='" +
height + @"px' src='" + filename + @"' />";
105 return imgObject;
106 }
107 }
108
109 /// <summary>
110 /// 弹出提示框
111 /// </summary>
112 /// <param name="message"> 提示信息 </param>
113 /// <returns> 提示框的JS代码 </returns>
114 public static string ShowMessage(string message)
115 {
116 return "<script>alert('" + message + "');</script>";
117 }
118
119 /// <summary>
120 /// 弹出提示框并且重定向到另一链接
121 /// </summary>
122 /// <param name="message"> 提示信息 </param>
123 /// <param name="urlToRedirect"> 重定向到的链接 </param>
124 /// <returns> 提示框的JS代码 </returns>
125 public static string ShowMessageAndRedirect(string message, string urlToRedirect)
126 {
127 return "<script>alert('" + message + "');document.location.href='" +
urlToRedirect + "'</script>";
128 }
129
130 /// <summary>
131 /// 打开可调节大小的窗口
132 /// </summary>
133 /// <param name="url"> 待打开的链接 </param>
134 /// <param name="width"> 宽度 </param>
135 /// <param name="height"> 高度 </param>
136 /// <param name="locationX"> 距屏幕左端的距离 </param>
137 /// <param name="locationY"> 据屏幕上端的距离 </param>
138 /// <returns> 可调节大小的窗口JS代码 </returns>
139 public static string OpenResizableWindow(string url, int width, int height,
int locationX, int locationY)
140 {
141 string jsString = @"width={0}, height={1}, left={2}, top={3},location=no,
menubar=no, resizable=yes, scrollbars=yes, status=yes, titlebar=no, toolbar=no, directories=no";
142 return OpenWindow(url, string.Format(jsString, width, height, locationX, locationY));
143 }
144
145 /// <summary>
146 /// 打开固定大小的窗口
147 /// </summary>
148 /// <param name="url"> 待打开的链接 </param>
149 /// <param name="width"> 宽度 </param>
150 /// <param name="height"> 高度 </param>
151 /// <param name="locationX"> 距屏幕左端的距离 </param>
152 /// <param name="locationY"> 据屏幕上端的距离 </param>
153 /// <returns> 固定大小的窗口JS代码 </returns>
154 public static string OpenFixedWindow(string url, int width, int height,
int locationX, int locationY)
155 {
156 string jsString = @"width={0}, height={1}, left={2}, top={3},location=no,
menubar=no, resizable=no, scrollbars=no, status=no, titlebar=no, toolbar=no, directories=no";
157 return OpenWindow(url, string.Format(jsString, width, height, locationX, locationY));
158 }
159
160 /// <summary>
161 /// 打开窗口
162 /// </summary>
163 /// <param name="url"> 待打开的链接 </param>
164 /// <param name="sFeatures"> 定义窗口格式 </param>
165 /// <returns> 打开窗口的JS代码 </returns>
166 public static string OpenWindow(string url, string sFeatures)
167 {
168 string jsString = @"<script type='text/javascript'>" +
169 @"window.open('{0}','','{1}');"+
170 @"</script>";
171 return string.Format(jsString, url, sFeatures);
172 }
173
174 /// <summary>
175 /// 打开可调节大小的模态对话框
176 /// </summary>
177 /// <param name="url"> 待打开的链接 </param>
178 /// <param name="width"> 模态对话框宽度 </param>
179 /// <param name="height"> 模态对话框高度 </param>
180 /// <returns> 模态对话框的JS代码 </returns>
181 public static string ShowResizableModalDialog(string url, int width, int height)
182 {
183 string sFeatures = "dialogWidth:{0}px;dialogHeight:{1}px;center:yes;
resizable:yes;status:yes;scroll:yes;edge:sunken; ";
184 return ShowModalDialog(url, string.Format(sFeatures, width, height));
185 }
186
187 /// <summary>
188 /// 打开固定大小的模态对话框
189 /// </summary>
190 /// <param name="url"> 待打开的链接 </param>
191 /// <param name="width"> 模态对话框宽度 </param>
192 /// <param name="height"> 模态对话框高度 </param>
193 /// <returns> 模态对话框的JS代码 </returns>
194 public static string ShowFixedModalDialog(string url, int width, int height)
195 {
196 string sFeatures = "dialogWidth:{0}px;dialogHeight:{1}px;center:yes;
resizable:no;status:no;scroll:no;";
197 return ShowModalDialog(url, string.Format(sFeatures, width, height));
198 }
199
200 /// <summary>
201 /// 打开模式对话框
202 /// </summary>
203 /// <param name="url"> 待打开的链接 </param>
204 /// <param name="sFeatures"> 定义模态对话框格式 </param>
205 /// <returns> 模态对话框的JS代码 </returns>
206 public static string ShowModalDialog(string url, string sFeatures)
207 {
208 string jsString = @"<script type='text/javascript'>" +
209 @"showModalDialog('{0}','','{1}'" +
210 @"</script>";
211 return string.Format(jsString, url, sFeatures);
212 }
213
214
215 }
216
