C# 常用方法

 using System; using System.Security.Cryptography; using System.IO; namespace Nature.Common { /// <summary> /// 常用函数。 /// </summary> public sealed class Functions { static Int32 index; #region 前面补零 /// <summary> /// 不住位数的数字，前面补零 /// </summary> /// <param name="value">要补足的数字</param> /// <param name="size">不齐的位数</param> /// <returns></returns> public static string Zerofill(string value, int size) { string tmp = ""; for (int i = 0; i < size - value.Length; i++) { tmp += "0"; } return tmp + value; } #endregion #region 过滤掉 html代码 /// <summary> /// 过滤html标签 /// </summary> /// <param name="strHtml">html的内容</param> /// <returns></returns> public static string StripHTML(string strHtml) { string[] aryReg ={ @"<mce:script[^><!-- ]*?>.*? // --></mce:script>", @"<(///s*)?!?((/w+:)?/w+)(/w+(/s*=?/s*(([""'])(//[""'tbnr]|[^/7])*?/7|/w+)|.{0})|/s)*?(///s*)?>", @"([/r/n])[/s]+", @"&(quot|#34);", @"&(amp|#38);", @"&(lt|#60);", @"&(gt|#62);", @"&(nbsp|#160);", @"&(iexcl|#161);", @"&(cent|#162);", @"&(pound|#163);", @"&(copy|#169);", @"&#(/d+);", @"-->", @"<!--.*/n" }; string[] aryRep = { "", "", "", "/"", "&", "<", ">", " ", "/xa1",//chr(161), "/xa2",//chr(162), "/xa3",//chr(163), "/xa9",//chr(169), "", "/r/n", "" }; string newReg = aryReg[0]; string strOutput = strHtml; for (int i = 0; i < aryReg.Length; i++) { System.Text.RegularExpressions.Regex regex = new System.Text.RegularExpressions.Regex(aryReg[i], System.Text.RegularExpressions.RegexOptions.IgnoreCase); strOutput = regex.Replace(strOutput, aryRep[i]); } //strOutput.Replace("<", ""); //strOutput.Replace(">", ""); strOutput = strOutput.Replace("/r/n", ""); return strOutput; } #endregion #region 全角半角转换 /// <summary> /// 转全角的函数(SBC case) /// </summary> /// <param name="input">任意字符串</param> /// <returns>全角字符串</returns> ///<remarks> ///全角空格为12288，半角空格为32 ///其他字符半角(33-126)与全角(65281-65374)的对应关系是：均相差65248 ///</remarks> public static string ToSBC(string input) { //半角转全角： char[] c = input.ToCharArray(); for (int i = 0; i < c.Length; i++) { if (c[i] == 32) { c[i] = (char)12288; continue; } if (c[i] < 127) c[i] = (char)(c[i] + 65248); } return new string(c); } /// <summary> 转半角的函数(DBC case) </summary> /// <param name="input">任意字符串</param> /// <returns>半角字符串</returns> ///<remarks> ///全角空格为12288，半角空格为32 ///其他字符半角(33-126)与全角(65281-65374)的对应关系是：均相差65248 ///</remarks> public static string ToDBC(string input) { char[] c = input.ToCharArray(); for (int i = 0; i < c.Length; i++) { if (c[i] == 12288) { c[i] = (char)32; continue; } if (c[i] > 65280 && c[i] < 65375) c[i] = (char)(c[i] - 65248); } return new string(c); } #endregion #region 传入URL返回网页的html代码 /// <summary> /// 传入URL返回网页的html代码 /// </summary> /// <param name="Url">URL</param> /// <returns></returns> public static string GetUrltoHtml(string Url) { try { System.Net.WebRequest wReq = System.Net.WebRequest.Create(Url); // Get the response instance. System.Net.WebResponse wResp = wReq.GetResponse(); // Read an HTTP-specific property //if (wResp.GetType() ==HttpWebResponse) //{ //DateTime updated =((System.Net.HttpWebResponse)wResp).LastModified; //} // Get the response stream. System.IO.Stream respStream = wResp.GetResponseStream(); // Dim reader As StreamReader = New StreamReader(respStream) System.IO.StreamReader reader = new System.IO.StreamReader(respStream, System.Text.Encoding.GetEncoding("gb2312")); return reader.ReadToEnd(); } catch (System.Exception ex) { //errorMsg = ex.Message; } return ""; } #endregion #region MD5加密字符串。截取字符串 /// <summary> /// 传入明文，返回用MD%加密后的字符串 /// </summary> /// <param name="str">要加密的字符串</param> /// <returns>用MD5加密后的字符串</returns> public static string ToMD5(string str) { return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "md5"); } /// <summary> /// 截取字符串。 /// </summary> /// <param name="str">要接取得字符串</param> /// <param name="number">保留的字节数。按半角计算</param> /// <returns>指定长度的字符串</returns> public static string StringCal(string str, int number) { Byte[] tempStr = System.Text.Encoding.Default.GetBytes(str); if (tempStr.Length > number) { return System.Text.Encoding.Default.GetString(tempStr, 0, number - 2) + ".."; } else return str; } #endregion #region 删除文件 /// <summary> /// 删除文件 /// </summary> /// <param name="FilePath">文件的物理地址</param> /// <returns></returns> public static bool DeleteFile(string FilePath) { try { System.IO.File.Delete(FilePath); return true; } catch { //errorMsg = "删除不成功！"; return false; } } #endregion #region 验证——数字部分 /// <summary> /// 判断是否是实数，是返回true 否返回false。可以传入null。 /// </summary> /// <param name="strVal">要验证的字符串</param> /// <returns></returns> public static bool IsNumeric(string strVal) { //System.Text.RegularExpressions.Regex reg1 = new System.Text.RegularExpressions.Regex("-?([0]|([1-9]+//d{0,}?))(.[//d]+)?$"); //return reg1.IsMatch(strVal); //string tmp=""; //判断是否为null 和空字符串 if (strVal == null || strVal.Length == 0) return false; //判断是否只有.、-、 -. if (strVal == "." || strVal == "-" || strVal == "-.") return false; //记录是否有多个小数点 bool isPoint = false; //是否有小数点 //去掉第一个负号，中间是不可以有负号的 strVal = strVal.TrimStart('-'); foreach (char c in strVal) { if (c == '.') if (isPoint) return false; else isPoint = true; if ((c < '0' || c > '9') && c != '.') return false; } return true; } /// <summary> /// 判断是否为整数。是返回true 否返回false。可以传入null。 /// </summary> /// <param name="strVal">要判断的字符</param> /// <returns></returns> public static bool IsInt(string strVal) { if (strVal == null || strVal.Length == 0) return false; //判断是否只有.、-、 -. if (strVal == "." || strVal == "-" || strVal == "-.") return false; //去掉第一个负号，中间是不可以有负号的 if (strVal.Substring(0, 1) == "-") strVal = strVal.Remove(0, 1); foreach (char c in strVal) { if (c < '0' || c > '9') return false; } return true; } /// <summary> /// 判断是否为ID串。是返回true 否返回false。可以传入null。 /// </summary> /// <example > /// ,1,2,3,4,5,6,7, /// </example> /// <param name="strVal">要判断的字符串</param> /// <returns></returns> public static bool IsIDString(string strVal) { bool flag = false; if (strVal == null) return false; if (strVal == "") return true; //判断是否只有 , if (strVal == ",") return false; //判断第一位是否是,号 if (strVal.Substring(0, 1) == ",") return false; //判断最后一位是否是,号 if (strVal.Substring(strVal.Length - 1, 1) == ",") return false; foreach (char c in strVal) { if (c == ',') if (flag) return false; else flag = true; else if ((c >= '0' && c <= '9')) flag = false; else return false; } return true; } /// <summary> /// 转换为整数。不是整数的话，返回“-1” /// </summary> /// <param name="str">要转换的字符</param> /// <returns></returns> public static int StringToInt(string str) { //判断是否是数字，是数字返回数字，不是数字返回-1 if (IsInt(str)) return Int32.Parse(str); else return -1; } /// <summary> /// 转换为实数。不是实数的话，返回“-1” /// </summary> /// <param name="str"></param> /// <returns></returns> public static float StrTofloat(string str) { //判断是否是数字，是数字返回数字，不是数字返回-1 if (IsNumeric(str)) return float.Parse(str); else return -1; } /// <summary> /// 验证是否是GUID /// 6454bc76-5f98-de11-aa4c-00219bf56456 /// </summary> /// <returns></returns> public static bool IsGUID(string strVal) { if (strVal == null) return false; if (strVal == "") return false; strVal = strVal.TrimStart('{'); strVal = strVal.TrimEnd('}'); //长度必须是36位 if (strVal.Length != 36) return false; foreach (char c in strVal) { if (c == '-') continue; else if (c >= 'a' && c <= 'f') continue; else if (c >= 'A' && c <= 'F') continue; else if ((c >= '0' && c <= '9')) continue; else return false; } return true; } #endregion #region 验证——处理字符串部分 /// <summary> /// 去掉两边的空格，把“'”替换为“＇”SBC /// </summary> /// <param name="str">要处理的字符串</param> /// <returns></returns> public static string StringReplaceToSBC(string str) { //过滤不安全的字符 string tstr; tstr = str.Trim(); return tstr.Replace("'", "＇"); } /// <summary> /// 去掉两边的空格，把“'”替换为“''”DBC /// </summary> /// <param name="str">要验证的字符串</param> /// <returns></returns> public static string StringReplaceToDBC(string str) { //过滤不安全的字符 string tstr; tstr = str.Trim(); return tstr.Replace("'", "''"); } /// <summary> /// 去掉两边的空格，把“'”替换为“” /// </summary> /// <param name="str">要验证的字符串</param> /// <returns></returns> public static string StringReplaceToEmpty(string str) { //过滤不安全的字符 string tstr; tstr = str.Trim(); return tstr.Replace("'", ""); } #endregion #region 验证——时间部分 /// <summary> /// 转换时间。不正确的话，返回当前时间 /// </summary> /// <param name="isdt">要转换的字符串</param> /// <returns></returns> public static DateTime StringToDateTime(string isdt) { //判断时间是否正确 DateTime mydt; try { mydt = Convert.ToDateTime(isdt); } catch { //时间格式不正确 return mydt = DateTime.Now; } return mydt; } /// <summary> /// 判断是否是正确的时间格式。正确返回“true”，不正确返回提示信息。 /// /// </summary> /// <param name="isdt">要判断的字符串</param> /// <returns></returns> public static bool IsDateTime(string isdt) { //判断时间是否正确 DateTime mydt; try { mydt = Convert.ToDateTime(isdt); return true; } catch { //时间格式不正确 //errorMsg = "您填的时间格式不正确，请按照2004-1-1的形式填写。"; return false; } } #endregion #region 输出信息 Response.Write /// <summary> /// 输出信息 Response.Write("消息") /// </summary> /// <param name="str"></param> public static void ResponseWrite(string str) { System.Web.HttpContext.Current.Response.Write(str); } #endregion #region 输出提示信息 /// <summary> /// 输出提示信息 /// </summary> /// <param name="title">提示信息</param> /// <param name="isEnd">true:结束运行；false:继续运行</param> public static void MsgBox(string title, bool isEnd) { System.Web.HttpContext.Current.Response.Write(title); if (isEnd) System.Web.HttpContext.Current.Response.End(); //System.Web.HttpContext.Current.ApplicationInstance.CompleteRequest(); } #endregion #region 弹出Alert窗口(静态) ///// <summary> ///// 返回js脚本——alert() ///// </summary> ///// <param name="str">提示信息</param> ///// <returns></returns> //public static string myAlert(string str) //{ // //输出提示信息 // return "<mce:script langue=javascript><!-- alert('" + str + "') // --></mce:script>"; //} /// <summary> /// (Descript) 弹出Alert窗口(静态) /// (Author) 谈伟 /// (Date) 2005-1-18 /// </summary> /// <param name="page">调用页面(一般为this.Page)</param> /// <param name="str_Message">弹出消息</param> public static void PageRegisterAlert(System.Web.UI.Page page, string str_Message) { //调用Page.RegisterStartupScript方法 page.ClientScript.RegisterStartupScript(page.GetType(), "a" + index, "<mce:script langue=javascript><!-- alert('" + str_Message + "') // --></mce:script>"); index++; if (index > 1000) index = 1; } /// <summary> /// /// </summary> /// <param name="page"></param> /// <param name="str_Message"></param> public static void PageRegisterJavascript(System.Web.UI.Page page, string str_Message) { //调用Page.RegisterStartupScript方法 page.ClientScript.RegisterStartupScript(page.GetType(), "a" + index, "<mce:script langue=javascript><!-- " + str_Message + " // --></mce:script>"); index++; if (index > 1000) index = 1; } /// <summary> /// /// </summary> /// <param name="page"></param> /// <param name="str_Message"></param> public static void PageRegisterString(System.Web.UI.Page page, string str_Message) { //调用Page.RegisterStartupScript方法 page.ClientScript.RegisterStartupScript(page.GetType(), "a" + index, str_Message); index++; if (index > 1000) index = 1; } #endregion #region 关闭当前窗口(静态) /// <summary> /// (Descript) 关闭当前窗口(静态) /// (Author) 谈伟 /// (Date) 2005-1-18 /// </summary> public static void CloseWindow() { System.Web.HttpContext.Current.Response.Write("<SCRIPT LANGUAGE=JAVASCRIPT>window.close()</SCRIPT>"); } #endregion #region 打开没有Toolbar的新窗口(静态) /// <summary> /// 返回js脚本——window.open('','') /// </summary> /// <param name="url">网址</param> /// <param name="name">目标</param> /// <returns></returns> public static string OpenWeb(string url, string name) { //输出提示信息 return "<mce:script language=javascript><!-- window.open('" + url + "','" + name + "') // --></mce:script>"; } /// <summary> /// (Descript) 打开没有Toolbar的新窗口(静态) /// (Author) 谈伟 /// (Date) 2005-1-18 /// </summary> /// <param name="str_Url">页面路径</param> /// <param name="int_Height">窗口高度</param> /// <param name="int_Width">窗口宽度</param> /// <param name="str_WebName">窗口名称</param> public static void OpenWindow(string str_Url, int int_Height, int int_Width, string str_WebName) { //构造JAVASCRIPT string str_JavaScript = @"<Script language='JavaScript'> window.open('" + str_Url + @"','" + str_WebName + @"','height=" + int_Height + @"','width=" + int_Width + @"','top=0,left=0,location=no,menubar=no,resizable=yes,scrollbars=yes,status=yes,titlebar=yes,toolbar=no,directories=no'); </Script>"; System.Web.HttpContext.Current.Response.Write(str_JavaScript); } #endregion #region 生成查询条件 /// <summary> /// 组成查询字符串 /// </summary> /// <param name="columnName">字段名</param> /// <param name="keyword">查询条件</param> /// <param name="hasContent">是否已经有查询条件了，true：加and；false：不加and</param> /// <param name="colType">1：数字；2：字符串，精确查询；3：字符串，模糊查询，包括时间查询</param> /// <returns></returns> public static string GetSearchString(string columnName, string keyword, ref bool hasContent, int colType) { if (keyword == "" || keyword == "0") { return ""; } else { System.Text.StringBuilder tmp = new System.Text.StringBuilder(); switch (colType) { case 1: //数字 tmp.Append(columnName); tmp.Append(" = "); tmp.Append(keyword); break; case 2: //字符串，精确查询 tmp.Append(columnName); tmp.Append(" = '"); tmp.Append(keyword); tmp.Append("' "); break; case 3: //字符串，模糊查询，包括时间查询 tmp.Append(columnName); tmp.Append(" like '% "); tmp.Append(keyword); tmp.Append("%' "); break; } if (hasContent) tmp.Insert(0, " and "); hasContent = true; return tmp.ToString(); } } #endregion } #region 加密、解密字符串 /// <summary> /// 加密字符串。可以解密 /// </summary> public class Encryptor { #region 加密，固定密钥 /// <summary> /// 加密 /// </summary> /// <param name="sourceData">原文</param> /// <returns></returns> public static string Encrypt(string sourceData) { //set key and initialization vector values //Byte[] key = new byte[] {0x21, 2, 0x88, 4, 5, 0x56, 7, 0x99}; //Byte[] iv = new byte[] {0x21, 2, 0x88, 4, 5, 0x56, 7, 0x99}; Byte[] key = new byte[] {1, 2, 3, 4, 5, 6, 7, 8}; Byte[] iv = new byte[] {1, 2, 3, 4, 5, 6, 7, 8}; try { //convert data to byte array Byte[] sourceDataBytes = System.Text.ASCIIEncoding.UTF8.GetBytes(sourceData); //get target memory stream MemoryStream tempStream = new MemoryStream(); //get encryptor and encryption stream DESCryptoServiceProvider encryptor = new DESCryptoServiceProvider(); CryptoStream encryptionStream = new CryptoStream(tempStream,encryptor.CreateEncryptor(key,iv),CryptoStreamMode.Write); //encrypt data encryptionStream.Write(sourceDataBytes,0,sourceDataBytes.Length); encryptionStream.FlushFinalBlock(); //put data into byte array Byte[] encryptedDataBytes = tempStream.GetBuffer(); //convert encrypted data into string return System.Convert.ToBase64String(encryptedDataBytes, 0,(int)tempStream.Length); } catch (Exception ex) { throw(ex); } } #endregion #region 加密，可以设置密钥 /// <summary> /// 可以设置密钥的加密方式 /// </summary> /// <param name="sourceData">原文</param> /// <param name="key">密钥，8位数字，字符串方式</param> /// <returns></returns> public static string Encrypt(string sourceData,string key) { //set key and initialization vector values //Byte[] key = new byte[] {0x21, 2, 0x88, 4, 5, 0x56, 7, 0x99}; //Byte[] iv = new byte[] {0x21, 2, 0x88, 4, 5, 0x56, 7, 0x99}; #region 检查密钥是否符合规定 if (key.Length > 8) { key = key.Substring(0, 8); } #endregion char[] tmp = key.ToCharArray(); Byte[] keys = new byte[8]; //Byte[] keys = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 }; Byte[] iv = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 }; //设置密钥 for (int i = 0; i < 8; i++) { if (tmp.Length > i) { keys[i] = (byte)tmp[i]; } else { keys[i] = (byte)i; } } try { //convert data to byte array Byte[] sourceDataBytes = System.Text.ASCIIEncoding.UTF8.GetBytes(sourceData); //get target memory stream MemoryStream tempStream = new MemoryStream(); //get encryptor and encryption stream DESCryptoServiceProvider encryptor = new DESCryptoServiceProvider(); CryptoStream encryptionStream = new CryptoStream(tempStream, encryptor.CreateEncryptor(keys, iv), CryptoStreamMode.Write); //encrypt data encryptionStream.Write(sourceDataBytes, 0, sourceDataBytes.Length); encryptionStream.FlushFinalBlock(); //put data into byte array Byte[] encryptedDataBytes = tempStream.GetBuffer(); //convert encrypted data into string return System.Convert.ToBase64String(encryptedDataBytes, 0, (int)tempStream.Length); } catch (Exception ex) { throw (ex); } } #endregion #region 解密，固定密钥 /// <summary> /// 解密 /// </summary> /// <param name="sourceData">密文</param> /// <returns></returns> public static string Decrypt(string sourceData) { //set key and initialization vector values //Byte[] key = new byte[] {0x21, 2, 0x88, 4, 5, 0x56, 7, 0x99}; //Byte[] iv = new byte[] {0x21, 2, 0x88, 4, 5, 0x56, 7, 0x99}; Byte[] keys = new byte[] {1, 2, 3, 4, 5, 6, 7, 8}; Byte[] iv = new byte[] {1, 2, 3, 4, 5, 6, 7, 8}; try { //convert data to byte array Byte[] encryptedDataBytes = System.Convert.FromBase64String(sourceData); //get source memory stream and fill it MemoryStream tempStream = new MemoryStream(encryptedDataBytes,0,encryptedDataBytes.Length); //get decryptor and decryption stream DESCryptoServiceProvider decryptor = new DESCryptoServiceProvider(); CryptoStream decryptionStream = new CryptoStream(tempStream, decryptor.CreateDecryptor(keys, iv),CryptoStreamMode.Read); //decrypt data StreamReader allDataReader = new StreamReader(decryptionStream); return allDataReader.ReadToEnd(); } catch (Exception ex) { throw(ex); } } #endregion #region 解密，固定密钥 /// <summary> /// 解密 /// </summary> /// <param name="sourceData">密文</param> /// <param name="key">密钥，8位数字，字符串方式</param> /// <returns></returns> public static string Decrypt(string sourceData, string key) { //set key and initialization vector values //Byte[] key = new byte[] {0x21, 2, 0x88, 4, 5, 0x56, 7, 0x99}; //Byte[] iv = new byte[] {0x21, 2, 0x88, 4, 5, 0x56, 7, 0x99}; #region 检查密钥是否符合规定 if (key.Length > 8) { key = key.Substring(0, 8); } #endregion char[] tmp = key.ToCharArray(); Byte[] keys = new byte[8]; //Byte[] keys = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 }; Byte[] iv = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 }; //设置密钥 for (int i = 0; i < 8; i++) { if (tmp.Length > i) { keys[i] = (byte)tmp[i]; } else { keys[i] = (byte)i; } } try { //convert data to byte array Byte[] encryptedDataBytes = System.Convert.FromBase64String(sourceData); //get source memory stream and fill it MemoryStream tempStream = new MemoryStream(encryptedDataBytes, 0, encryptedDataBytes.Length); //get decryptor and decryption stream DESCryptoServiceProvider decryptor = new DESCryptoServiceProvider(); CryptoStream decryptionStream = new CryptoStream(tempStream, decryptor.CreateDecryptor(keys, iv), CryptoStreamMode.Read); //decrypt data StreamReader allDataReader = new StreamReader(decryptionStream); return allDataReader.ReadToEnd(); } catch (Exception ex) { throw (ex); } } #endregion } #endregion }