NET开发中你可能会用到的常用方法总结.doc

将文件转换成字符串,常用于读取网站模板/将文件转换成字符串,常用于读取网站模板/publicstaticstringGetTempleContent(stringpath)stringresult=string.Empty;stringsFileName=HttpContext.Current.Server.MapPath(path);if(File.Exists(sFileName)tryusing(StreamReadersr=newStreamReader(sFileName)result=sr.ReadToEnd();catchresult=读取模板文件(+path+)出错;elseresult=找不到模板文件：+path;returnresult;读取,添加，修改xml文件/读取,添加，修改xml文件/Xml路径/新的子节点名称/新节点对应的值/1：读取，否则为修改或者添加/1：修改添加成功，为空字符串表示修改添加成功，否则是读取成功publicstaticstringgetXML(stringXmlpath,stringNode,stringValue,intflag)trystringfilepath=HttpContext.Current.Server.MapPath(Xmlpath);XmlDocumentxmlDoc=newXmlDocument();if(!File.Exists(filepath)XmlDeclarationxn=xmlDoc.CreateXmlDeclaration(1.0,utf-8,null);XmlElementroot=xmlDoc.CreateElement(rss);XmlElementroot1=xmlDoc.CreateElement(item);root.AppendChild(root1);xmlDoc.AppendChild(xn);xmlDoc.AppendChild(root);xmlDoc.Save(filepath);/本地路径名字xmlDoc.Load(filepath);/你的xml文件stringReStr=string.Empty;XmlElementxmlObj=xmlDoc.DocumentElement;XmlNodeListxmlList=xmlDoc.SelectSingleNode(xmlObj.Name.ToString().ChildNodes;foreach(XmlNodexmlNoinxmlList)if(xmlNo.NodeType!=XmlNodeType.Comment)/判断是不是注释类型XmlElementxe=(XmlElement)xmlNo;if(xe.Name=xmlObj.FirstChild.Name)XmlNodeListxmlNList=xmlObj.FirstChild.ChildNodes;foreach(XmlNodexmldinxmlNList)XmlElementxe1=(XmlElement)xmld;if(xe1.Name=Node)if(flag=1)/读取值if(xmld.InnerText!=null&xmld.InnerText!=)ReStr=xmld.InnerText;else/修改值xmld.InnerText=Value;/给节点赋值xmlDoc.Save(filepath);ReStr=Value.Trim();if(ReStr=string.Empty)/添加节点XmlNodenewNode;newNode=xmlDoc.CreateNode(element,Node,Value);/创建节点newNode.InnerText=Value;/给节点赋值xe.AppendChild(newNode);/把节点添加到docxmlDoc.Save(filepath);ReStr=Value.Trim();returnReStr;catchreturnstring.Empty;取得文件扩展名/取得文件扩展名/文件名/扩展名publicstaticstringGetFileEXT(stringfilename)if(string.IsNullOrEmpty(filename)return;if(filename.IndexOf(.)=-1)return;intpos=-1;if(!(filename.IndexOf()=-1)pos=filename.LastIndexOf();strings=filename.Substring(pos+1).Split(.);returns1;替换文本中的空格和换行/替换文本中的空格和换行/publicstaticstringReplaceSpace(stringstr)strings=str;s=s.Replace(, );s=s.Replace(n,);returns;验证码实现方法protectedvoidPage_Load(objectsender,EventArgse)stringcheckCode=CreateRandomCode(4);SessionCheckCode=checkCode;CreateImage(checkCode);privatestringCreateRandomCode(intcodeCount)/函数功能:产生数字和字符混合的随机字符串stringallChar=0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ;charallCharArray=allChar.ToCharArray();stringrandomCode=;Randomrand=newRandom();for(inti=0;icodeCount;i+)intr=rand.Next(61);randomCode+=allCharArray.GetValue(r);returnrandomCode;privatevoidCreateImage(stringcheckCode)/生成图象验证码函数intiwidth=(int)(checkCode.Length*11.5);System.Drawing.Bitmapimage=newSystem.Drawing.Bitmap(iwidth,20);Graphicsg=Graphics.FromImage(image);Fontf=newSystem.Drawing.Font(Arial,10,System.Drawing.FontStyle.Bold);Brushb=newSystem.Drawing.SolidBrush(Color.Azure);/字母白色/g.FillRectangle(newSystem.Drawing.SolidBrush(Color.Blue),0,0,image.Width,image.Height);g.Clear(Color.Brown);/背景灰色g.DrawString(checkCode,f,b,3,3);PenblackPen=newPen(Color.Black,0);Randomrand=newRandom();System.IO.MemoryStreamms=newSystem.IO.MemoryStream();image.Save(ms,System.Drawing.Imaging.ImageFormat.Jpeg);Response.ClearContent();Response.ContentType=image/Jpeg;Response.BinaryWrite(ms.ToArray();g.Dispose();image.Dispose();文件创建、复制、移动、删除FileStreamfs;/创建文件fs=File.Create(Server.MapPath(a.txt);fs.Close();fs=File.Create(Server.MapPath(b.txt);fs.Close();fs=File.Create(Server.MapPath(c.txt);fs.Close();/复制文件File.Copy(Server.MapPath(a.txt),Server.MapPath(aa.txt);/移动文件File.Move(Server.MapPath(b.txt),Server.MapPath(ab.txt);File.Move(Server.MapPath(c.txt),Server.MapPath(ac.txt);/删除文件File.Delete(Server.MapPath(a.txt);去掉结尾，/去掉结尾，/publicstaticstringLostDot(stringinput)if(string.IsNullOrEmpty(input)returnstring.Empty;elseif(input.IndexOf(,)-1)intintLast=input.LastIndexOf(,);if(intLast+1)=input.Length)returninput.Remove(intLast);elsereturninput;elsereturninput;生成任意位数的随机数/生成随机数/最小值/最大值/privateintgetRandom(intminValue,intmaxValue)Randomri=newRandom(unchecked(int)DateTime.Now.Ticks);intk=ri.Next(minValue,maxValue);returnk;/想定一个三位的随机数：stringThreeRandom=this.getRandom(100,999).Tostring();/类似的，四位随机数：stringFourRandom=this.getRandom(1000,9999).Tostring();实现文件的上传publicclassUploadprivateSystem.Web.HttpPostedFilepostedFile=null;privatestringsavePath=;privatestringextension=;privateintfileLength=0;privatestringfilename=;/上传组件/publicSystem.Web.HttpPostedFilePostedFilegetreturnpostedFile;setpostedFile=value;/保存路径/publicstringSavePathgetif(savePath!=)returnsavePath;returnc:;setsavePath=value;/文件大小/publicintFileLengthgetif(fileLength!=0)returnfileLength;return1024;setfileLength=value*1024;/文件护展名/publicstringExtensiongetif(extension!=)returnextension;returntxt;setextension=value;/文件名/publicstringFileNamegetreturnfilename;setfilename=value;publicstringPathToName(stringpath)intpos=path.LastIndexOf();returnpath.Substring(pos+1);/上传文件/publicstringUploadStart()booltf=false;stringreturnvalue=;if(PostedFile!=null)trystringfileName=PathToName(PostedFile.FileName);if(filename!=)fileName=filename;string_fileName=;stringExten=Extension.Split(,);if(Exten.Length=0)returnvalue=你未设置上传文件类型,系统不允许进行下一步操作!;elsefor(inti=0;iFileLength)returnvalue=上传文件限制大小:+FileLength/1024+kb!;stringIsFileex=SavePath+fileName;if(!Directory.Exists(SavePath)Directory.CreateDirectory(SavePath);PostedFile.SaveAs(IsFileex);_fileName=fileName;tf=true;returnvalue=IsFileex;if(tf=false)returnvalue=只允许上传+Extension+文件!;catch(System.Exceptionexc)returnvalue=exc.Message;elsereturnvalue=上文件失败!;returnreturnvalue;判断输入是否为日期类型/判断输入是否为日期类型/待检查数据/publicstaticboolIsDate(strings)if(s=null)returnfalse;elsetryDateTimed=DateTime.Parse(s);returntrue;catchreturnfalse;MD5加密字符串处理/MD5加密字符串处理/加密是16位还是32位；如果为true为16位publicstaticstringMD5(stringInput,boolHalf)stringoutput=System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(Input,MD5).ToLower();if(Half)output=output.Substring(8,16);returnoutput;publicstaticstringMD5(stringInput)returnMD5(Input,true);过滤非法字符，防止注入式攻击等/过滤字符/publicstaticstringFilter(stringsInput)if(sInput=null|sInput.Trim()=string.Empty)returnnull;stringsInput1=sInput.ToLower();stringoutput=sInput;stringpattern=*|and|exec|insert|select|delete|update|count|master|truncate|declare|char(|mid(|chr(|;if(Regex.Match(sInput1,Regex.Escape(pattern),RegexOptions.Compiled|RegexOptions.IgnoreCase).Success)thrownewException(字符串中含有非法字符!);elseoutput=output.Replace(,);returnoutput;常用的加密解密（DES，RSA）usingSystem.Security.Cryptography;usingSystem.Text;/DES加密/待加密的字符串/加密密钥/publicstaticstringEncrypt(stringEncryptString,byteKey,byteIV)/bytergbKey=Encoding.UTF8.GetBytes(key.Substring(0,8);byteinputByteArray=Encoding.UTF8.GetBytes(EncryptString);DESCryptoServiceProviderdes=newDESCryptoServiceProvider();MemoryStreammStream=newMemoryStream();CryptoStreamcStream=newCryptoStream(mStream,des.CreateEncryptor(Key,IV),CryptoStreamMode.Write);cStream.Write(inputByteArray,0,inputByteArray.Length);cStream.FlushFinalBlock();returnConvert.ToBase64String(mStream.ToArray();/DES解密/待解密的字符串/解密密钥,要求为8位,和加密密钥相同/解密成功返回解密后的字符串,失败返源串publicstaticstringDecrypt(stringDecryptString,byteKey,byteIV)try/bytergbKey=Encoding.UTF8.GetBytes(Key);byteinputByteArray=Convert.FromBase64String(DecryptString);DESCryptoServiceProviderdes=newDESCryptoServiceProvider();MemoryStreammStream=newMemoryStream();CryptoStreamcStream=newCryptoStream(mStream,des.CreateDecryptor(Key,IV),CryptoStreamMode.Write);cStream.Write(inputByteArray,0,inputByteArray.Length);cStream.FlushFinalBlock();returnEncoding.UTF8.GetString(mStream.ToArray();catchreturn;/RSA加解密算法/publicclassRSA/RSA加密函数/说明KEY必须是XML的行式,返回的是字符串/publicstringEncrypt(stringxmlPublicKey,stringEncryptString)bytePlainTextBArray;byteCypherTextBArray;stringResult;RSACryptoServiceProviderrsa=newRSACryptoServiceProvider();rsa.FromXmlString(xmlPublicKey);PlainTextBArray=(newUnicodeEncoding().GetBytes(EncryptString);CypherTextBArray=rsa.Encrypt(PlainTextBArray,false);Result=Convert.ToBase64String(CypherTextBArray);returnResult;/RSA解密函数/publicstringDecrypt(stringxmlPrivateKey,stringDecryptString)bytePlainTextBArray;byteDypherTextBArray;stringResult;RSACryptoServiceProviderrsa=newRSACryptoServiceProvider();rsa.FromXmlString(xmlPrivateKey);PlainTextBArray=Convert.FromBase64St