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C#代码常见问题 By TerabyteX 薛江白
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C#代码常见问题
1.
性耽瀸倳＀ 1 耷倀请汀怰怮＀倫使瀨Request.Paramsï¼€Params伀什4ä¸ªé€€å€€é€€æ€¥è ¯
¢æ€°æ€®ã€€å¦€æ€€ç¡®å®€æ€¯post迀急瀀怰怮就使瀨Formï¼€get倀使瀨QueryStr ing＀以æ¤ç±»æ€¨ 2ã€€å¯¹è±¡å€ªæ€€å€¨ç€¨å€°ç€€æ€¶å€€æ€€å®€ä¾€å€€ï¼€ä¸€è¦€å®€ä¾€å€€æ€ ç€¨ç€€å ¯¹è±¡ï¼€å¼€ç€¨ç±»å€€å¯¹è±¡å€¨æ²¡æ€€å®€ä¾€å€€ä¹€å€€ï¼€ä¸€å¾€èμ€å€¼nullï¼€é€¿å€ €å€€é€€å¤€ä½€ç€€å€€å€ var mailMessage = new MailMessage(); if (!string.IsNullOrEmpty(tUser.Email)) { var toAddress = new MailAddress(tUser.Email, tUser.Fullname, Encoding.UTF8); mailMessage.To.Add(toAddress); ... } 怹怀 if (!string.IsNullOrEmpty(tUser.Email)) { var mailMessage = new MailMessage(); var toAddress = new MailAddress(tUser.Email, tUser.Fullname, Encoding.UTF8); mailMessage.To.Add(toAddress); ... } 3 倨倹退夀怀觀倀瀀å€ç¬¦ä¸²æ€¶ï¼€æ€€ä½¿ç€¨æ£å€€ï¼€æ- £å€€ä¼€å½±å€€æ€§è€½ï¼€å€¦å¤€string瀀怹泀绀倀＀往夀怶倀毀æ- £å€€ç€€æ€§è€½æ€´å¥½ 4 倻逤一忀覀瀀逻辀 if ((MessageName.Equals("mentioned", StringComparison.OrdinalIgnoreCase) || MessageName.Equals("comment", StringComparison.OrdinalIgnoreCase)) && !string.IsNullOrEmpty(MessageName)) Q: 倻怀倪个＀ return CurrentUser.UserID == member.UserID ? true : false; Q: 逮颀倨倪＀ 5 一覀一倳倰newå¯¹è±¡ï¼€å¾€å¤€ç€¸ä¼¼ç€€å¯¹è± ¡ï¼€å€¯ä»¥ä½¿ç€¨Clone倀æμ€å¤€å€¶ï¼€æ€€å€€æ€§è€½ var arr = new [] { "a", "b", "c" }; var cloneArr = arr.Clone(); Console.WriteLine(arr == cloneArr); //false 6 倨å€ç¬¦ä¸²è¢«å€€å¤€èμ€å€¼ã€€è¿€æ€¥ç€€æ€€å€μ一(尤倶倨循瀯è¯- 倥ä¸)＀使瀨StringBuilder怿怢string＀倀尀倀å€ä½¿ç€¨ï¼€æ€€å€€æ€§è€½ 线稀瀸倳＀ 1 一覀使瀨线稀瀀Sleep怹泀＀退常怀 å€μ一＀一庀该倻逻塀线稀 2 夀线稀倀æ¥ï¼€ä½¿ç€¨lock倀倀退怀怯 3ã€€ä¸€è¦€æ€€å€¨å€€å»ºçº¿ç¨€ï¼€åº€è¯¥ä½¿ç€¨çº¿ç¨€æ± æ€€è€€TPL 注退瀸倳＀ 1 倽怰 局性 类瀀注退＀使瀨XML注退＀类倀倽怰瀀倀 逨倀退 倽怰瀀倀逨倀耽使瀨怮退注退 2ã€€æ€ ç€¨ç€€ä»£ç €ï¼€ç€´æ€¥å€ æ€€ï¼€å¦€æ€€æ€€æ€ªå®€æ€€ç€€å€€è€½ï¼€ä½¿ç€¨t odo注退 3 todo注退瀀觀耀＀为亀大家瀀todo注退一混淀＀todoæ³¨é€€ä½¿ç€¨ä »¥ä¸€æ€¹å¼€ todo:瀨怷倀 倀耽
2.
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1㄄使焨Environment.NewLineæ„¿æ„¢rn 2㄄使焨string.Emptyæ„¿æ„¢"" 3㄄焨Lambda表达弄愿愢儿億愹泄 var isContain = calendar.Members.Exists(delegate(CalendarMember member) { return CurrentUser.UserID == member.UserID; }); 愹愄 var isContain = calendar.Members.Exists(member => CurrentUser.UserID == member.UserID ); 4㄄使焨string.Formatæ„¿æ„¢å„符串迄愥(æ„„è„„ 使焨StringBuilderç„„Appendå„„AppendFormat) var url = Common.MSServerIPath + "/notification/set?key=" + UserId.ToLower() + "&field=" + MessageName + "&type=" + Increment.ToString(); 愹愄 var url = string.Format("{0}/notification/set? key={1}&field={2}&type={3}", Common.MSServerIPath, UserId.ToLower(), MessageName, Increment.ToString()); 5㄄屄鄨億鄄丄径使焨射億å„毄弄头 6㄄丄覄儺焰HTMLå„ç¬¦ä¸²ç„„æ„¿æ„¢ã„„æ„¼æ„¥ç„ æ„„ä½„ï¼„åº„è¯¥ä½¿ç„¨æ¨¡æ„¿æ„¥ç„„æ„„HTML 7㄄愨脄使焨对象億姄億儨 8㄄鄄焨儽億规脄$尽鄄规鄿thiså„³é„®å„ ï¼„ç§„æ„„å„„é„„ä½¿ç„¨ä¸„å„„çº¿å¼„å¤´ï¼„å„¬æ„„å„„é„„å„„å±„æ„§ 大億å„毄弄头 9㄄棄愥类億转愢愯儦处佄$億愬强儶转愢億asè½¬æ„ ¢ï¼„迄愄丄覄对å„符串谄焨ToString愹泄 10㄄鄤亄DALå±„ï¼„å„¶ä»„ä»£ç „ä¸é„½ä¸„覄儺焰ADO.NETä»£ç „(å„„å±„ç„„é„ „覄愧㄄億脽億解) 11㄄愹泄焄億愰$妄愄趄迄3个$射迄亄億愰组億愄class 12㄄儨if愡件億愯ä¸ï¼„å§„ç»„ä½¿ç„¨å¤§æ„¬å„·ï¼„å„³ä½¿å„ªæ„„ä¸„è¡„ä»£ç „(Googleç„„ç¼„ç „æ „å„„)$dangling-else鄮预 http://baike.baidu.com/view/1338434.htm#3 13㄄愩屄愹泄组丄愾儰丄个儰愹 14㄄使焨var儳鄮å„ï¼„å„„å°„ä»£ç „å½„å„ ¥ï¼„new丄个屄鄨億鄄$丄径使焨var声愄 愄焄愳泄$使焨varæ„¥å„„å§„å„„å¯¹è±¡ï¼„å¯¹ä»¥å„„é„„æ„„ä»£ç „ä¼ „径愄好处$毄妄Cat cat = new Cat()对毄var cat = new Cat()$愹愄BlackCatï¼„å„„é„¢ç„„ä»£ç „å„ªé„„æ„¿æ„¢ä¸„å¤„ï¼„å°¤å„¶å„¨foreachè¯- å„¥ä¸ï¼„使焨var儳鄮å„$缄评儨伄脪儨愨æ„- ç±»å„„ï¼„å„³ä½¿ä¿®æ„¹äº„æ„°ç»„ç„„ç±»å„„ï¼„ä¹„ä¸„é„„è¦„ä¿®æ„¹ä»£ç „ 15㄄使焨億并愄佄符??愄宄黄认儼$鄿億使焨儤æ„- nullç„„ifè¯å„¥ 16ã„„ä»£ç „ä¸ä¸„覄儺焰ä¸æ„„億鄄㄄类億ç„儽億 17ã„„é„¿å„„ç¡¬ç¼„ç „ï¼„æ¯„å¦„å„符串焄ä¸æ„„ç¡¬ç¼„ç „ï¼„ä¸¥é„„å½±å„„æ„¬å„ °å„„ 18ã„„Responseæ·»å„ å¤´é„¨ã„„è¾„å„ºã„„æ¸„é„¤ç„愹泄愾儨丄èμ· 19㄄丄覄儺焰处佄焄修饰评$myResponseStream --> responseStream 20㄄妄愄儨switchè¯å„¥ä¸default丄億任佄处焄$焄焥愄default 21㄄愹泄億丄覄儺焰愰å„億丄億线$丄覄使焨 ReadAllSystemMessage2 è¿„æ ·ç„„æ„¹æ³„å„„ï¼„ä¸„è¦„é„„æ„„ç„„å®„ä¹„æ„¹æ³„å„„ï¼„ç„®å„„ç„„ä»£ç „å„ å„¨Addã„„Addedã„„Add2ã„„DoAddå„„ç§„æ¯«æ„ ç« æ³„ç„„æ„¹æ³„å„„ 22㄄类愾儰焹宄焄儽億空鄴$儫愾儨儨屄儽億空鄴ä¸- ï¼„å„„ç„„ä½¿ç„¨å„½å„„ç©ºé„´ï¼„é„¿å„„ä½¿ç„¨ç±»å„ ¨å„„$使焨using对丄億儽億空鄴焄
3.
相四类四四囫四;蛛丛曯使盨囨称 23㛛盨 case
宛盰夛路四曯;尤囶曯常雛盛相ç›æ¯›è¾› 24ã››é›μ循DRYå››å››ï¼›æ››é››å¤›ç››ä»£ç ›ï¼›å°±è¿›è¡›é››æ››ã››æ¯›å¦›å¯¹ä»£ ç ›å››ç››å›°å››ç»›ï¼›å›«æ››é›»è¾›å ›å›¨ä¸›ä¸ªæ›¹æ³›å››é››ï¼›é››æ››æ››å¤›ä¸ªå››ä¸ ›å››è›½ç››å›½æ›° 国四空雴相図; 1ã››å›»é›¤æ› ç›¨ç››å›½å››ç©ºé›´ 2㛛弛盨国四空雴曶;进衛四绛;馛四曯.NET Frameworkç››å›½å››ç©ºé›´ï¼›å›¶æ¬¡æ›¯ç¬¬ä¸›æ›¹ç»›ä»¶ç››å›½å››ç©ºé› ´ï¼›æ››å››æ›¯é¡¹ç›®ä¸ç››å›½å››ç©ºé›´ using System; using System.Collections.Generic; using ServiceStack; using ServiceStack.Text; using MD.Entity; using MD.Entity.PostImplement; 弛常夛盛相図; 1㛛盨throw雛曰曛固弛常;囫盨throw errï¼›ä¼›ç ´å››å ›æ ›ä¿¡æ›¯ http://www.cnblogs.com/JerryTian/archive/2012/09/24/2699459.html 2㛛妛曛丛盨catchè¯å›¥ï¼›æ›¨è››ä½¿ç›¨usingè¯å›¥ (雛盨些曛囡屛四丛囡電辛屛;盨曥雛曾èμ›æº›) 3ã››å›¨æ››å›¡å±›å››ä¸›å›¡é›»è¾›å±›ï¼›ä¸›è¦›å››å¼›å¸¸å¤›ç››ä»£ç ›ï¼›å¼›å¸¸å º›è¯¥æ››ç»›è°›ç›¨è››ï¼›ç›±è°›ç›¨è››æ›¥å¤›ç››(进雛盛谛盨蛛 ;主覛曯Web项目) 4㛛弛常夛盛catchè¯å›¥ä¸ï¼›ä¸›è¦›å››ç©ºè¯å›¥ï¼›è¿›æ ·å››ç›¸å½›äº›æ››å¼ ›å¸¸ç»›é››è››äº›ï¼›åº›è¯¥è®°å½›é››è¯¯æ›¥å¿›æ››è››throw固曥 囶仛建议; 1㛛使盨泛四曽象曰曮绛曛 2ã››å›ç¬¦ç¼›ç ›ä¸›å¾›ä½¿ç›¨System.Text.Encodingï¼›ä¸›è¦›ä½¿ç›¨è¿›æ›¶ç››å› ç¬¦ç¼›ç ›ç±»å›› UTF8Encoding.UTF8 3㛛四供模弛;丛宛覛四曛sealed寛尛类 4㛛四盛使盨强囶转曢四as曛佛符;囨转曢丛宛曛四盛曛 å›μ丛;使盨强囶转曢;囦四使盨as
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