1.反射创建类型
//3 列排序 Type t = data.ElementType; //var pcs = Activator.CreateInstance(t, new object[] { // "addTime", // Common.ListSortDirection.Ascending //}); Type type = typeof(PropertySortCondition<>); type = type.MakeGenericType(t); var pcs = Activator.CreateInstance(type, new object[] { "addTime", Common.ListSortDirection.Ascending });
2.写入TXT文件
#region 写文件（.txt-添加） /// <summary> /// 写文件 /// </summary> /// <param name="FileName">文件路径,相对路径，不需要写扩展名</param> /// <param name="Strings">文件内容</param> private void WriteFile(string FileName, string Strings) { string Path = System.Web.HttpContext.Current.Server.MapPath("~/" + FileName + ".txt"); if (!System.IO.File.Exists(Path)) { System.IO.FileStream f = System.IO.File.Create(Path); f.Close(); f.Dispose(); } System.IO.StreamWriter f2 = new System.IO.StreamWriter(Path, true, System.Text.Encoding.UTF8); f2.WriteLine(Strings); f2.Close(); f2.Dispose(); } #endregion
3.参数对比与赋值
System.Threading.Interlocked.CompareExchange(ref "参数1","参数3","参数2");
参数1与参数2对比，一样就把参数3复制给参数1.不一样就把参数2赋值给参数1.这个方法返回的是原始的参数1，即返回值在此方法没有赋值前已经确认。
4.操作xml文件
//创建xml文件 string mPath = Application.StartupPath + "/record.xml";//创建位置 if (!File.Exists(mPath)) { CreateXMLDoc(); mXmlDoc.Load(mPath); } //添加节点 public void CreateXMLDoc() { if (!File.Exists(mPath)) { XmlDocument xmldoc = new XmlDocument(); //加入XML的声明段落 xmldoc.AppendChild(xmldoc.CreateXmlDeclaration("1.0", "UTF-8", null)); XmlElement rMainNode = xmldoc.CreateElement("", "settings", ""); rMainNode.IsEmpty = false; xmldoc.AppendChild(rMainNode); XmlElement rIp = xmldoc.CreateElement("", "ips", ""); rIp.IsEmpty = false; rMainNode.AppendChild(rIp); XmlElement rPort = xmldoc.CreateElement("", "ports", ""); rPort.IsEmpty = false; rMainNode.AppendChild(rPort); XmlElement rName = xmldoc.CreateElement("", "names", ""); rName.IsEmpty = false; rMainNode.AppendChild(rName); XmlElement rPreviousRecord = xmldoc.CreateElement("", "previousreocrd", ""); rPreviousRecord.IsEmpty = false; rMainNode.AppendChild(rPreviousRecord); xmldoc.Save(mPath); } } /////删除节点 XmlNode rMainNode = mXmlDoc.SelectSingleNode("settings"); XmlNode rNode = rMainNode.SelectSingleNode("names"); XmlNodeList rList = rNode.ChildNodes; List<string> list = new List<string>(); foreach (XmlNode r in rList) { XmlElement rElem = (XmlElement)r; list.Add(rElem.GetAttribute("value").ToString().Split(',')[0]); if (rElem.GetAttribute("value").ToString().Split(',')[0] == tb_name.Text) { rNode.RemoveChild(rElem); } }
5.读写ini文件
#region 读Ini文件 /// <summary> /// /// </summary> /// <param name="Section">节名</param> /// <param name="Key">键名</param> /// <param name="NoText">读取失败返回值</param> /// <param name="iniFilePath">路径</param> /// <returns>读取值</returns> public static string ReadIniData(string Section, string Key, string NoText, string iniFilePath) { if (File.Exists(iniFilePath)) { StringBuilder temp = new StringBuilder(1024); GetPrivateProfileString(Section, Key, NoText, temp, 1024, iniFilePath); return temp.ToString(); } else { return String.Empty; } } #endregion #region 写Ini文件 /// <summary> /// /// </summary> /// <param name="Section">节名</param> /// <param name="Key">键名</param> /// <param name="Value">值</param> /// <param name="iniFilePath">路径</param> /// <returns></returns> public static bool WriteIniData(string Section, string Key, string Value, string iniFilePath) { if (File.Exists(iniFilePath)) { long OpStation = WritePrivateProfileString(Section, Key, Value, iniFilePath); if (OpStation == 0) { return false; } else { return true; } } else { return false; } } #endregion
6.读写web.config文件
//定义对象 static Configuration config =System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration("~"); //读取 string access_token = config.AppSettings.Settings["access_token"].Value; //写入 AppSettingsSection app = config.AppSettings; app.Settings["access_token"].Value = token.access_token; config.Save(ConfigurationSaveMode.Modified);
7.拼接json字符串
//参数拼接 string param = "";//这里是开始位置 param += "{"; param += "\"" + "touser" + "\":\"" + openid + "\","; param += "\"" + "template_id" + "\":\"" + "xa-8MK5i0UI3rv-icn_7WTaE3mytLvti0bfoLW1hJFo" + "\","; param += "\"" + "url" + "\":\"" + JumpUrl + "\","; param += "\"" + "data" + "\""; param += ":"; param += "{"; param += "\"" + "content" + "\""; param += ":"; param += "{"; param += "\"" + "value" + "\":\"" + msg + "\","; param += "\"" + "color" + "\":\"" + "#173177" + "\""; param += "}"; param += "},"; param = param.TrimEnd(','); param += "}";
8.反射创建类并运行其中一个方法
//Type[] mytypes = Assembly.GetExecutingAssembly().GetTypes(); Type type= typeof(User);//user 是类 var methom = Activator.CreateInstance(type);//反射创建类 MethodInfo methodinfo = type.GetMethod(_mess);//获取方法 _mess参数是自定义字符串为方法名称 methodinfo.Invoke(methom, null);//运行方法
9.多级linq关联存在关联数据不存在的情况
(from a in childData //主关联文件 join bj in bjCostData //副关联文件数据可能存在数据没有对应关联 on a.id equals bj.childId //关联键 into bj from bje in bj.DefaultIfEmpty() //存在没有关系对应关联是的处理 join bjt in bjRefundData on a.id equals bjt.childId into bjt from bjte in bjt.DefaultIfEmpty()select new H_ChildStatistics { id = a.id, parkId = a.parkId, parkName = a.parkName, childName = a.childName, childNameEng = a.childNameEng, gradeNo = a.gradeNo, classNo = a.classNo, modifyTime = a.modifyTime, bjfTotalReceive = bje == null ? 0 : bje.payTotalMoney, bjfTotalRefund = bjte == null ? 0 : bjte.payTotalMoney, childTotalReceive =0 , childTotalRefund =0 , });
作者：YanBigFeg —— 颜秉锋
出处：http://www.cnblogs.com/yanbigfeg
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