C#反射总结
C#反射總結(jié)
Reflection,中文翻譯為反射。這是.Net中獲取運(yùn)行時(shí)類(lèi)型信息的方式,.Net的應(yīng)用程序由幾個(gè)部分:‘程序集(Assembly)’、‘模塊(Module)’、‘類(lèi)型(class)’組成,而反射提供一種編程的方式,讓程序員可以在程序運(yùn)行期獲得這幾個(gè)組成部分的相關(guān)信息,例如:Assembly類(lèi)可以獲得正在運(yùn)行的裝配件信息,也可以動(dòng)態(tài)的加載裝配件,以及在裝配件中查找類(lèi)型信息,并創(chuàng)建該類(lèi)型的實(shí)例。Type類(lèi)可以獲得對(duì)象的類(lèi)型信息,此信息包含對(duì)象的所有要素:方法、構(gòu)造器、屬性等等,通過(guò)Type類(lèi)可以得到這些要素的信息,并且調(diào)用之。MethodInfo包含方法的信息,通過(guò)這個(gè)類(lèi)可以得到方法的名稱(chēng)、參數(shù)、返回值等,并且可以調(diào)用之。諸如此類(lèi),還有FieldInfo、EventInfo等等,這些類(lèi)都包含在System.Reflection命名空間下。
一、Type類(lèi)于獲取類(lèi)型信息
System.Type 類(lèi)對(duì)于反射起著核心的作用。當(dāng)反射請(qǐng)求加載的類(lèi)型時(shí),公共語(yǔ)言運(yùn)行庫(kù)將為它創(chuàng)建一個(gè) Type。您可以使用 Type 對(duì)象的方法、字段、屬性和嵌套類(lèi)來(lái)查找有關(guān)該類(lèi)型的所有信息。
大家運(yùn)行一下下面的代碼根據(jù)結(jié)果分析一下就能比較清楚的理解Type了
?
獲取類(lèi)型信息namespace?ConsoleApplication2
{
????class?Program
????{
????????static?void?Main(string[]?args)
????????{
????????????MyClass?m?=?new?MyClass();
????????????Type?type?=?m.GetType();
????????????Console.WriteLine("類(lèi)型名:"?+?type.Name);
????????????Console.WriteLine("類(lèi)全名:"+type.FullName);
????????????Console.WriteLine("命名空間名:"+type.Namespace);
????????????Console.WriteLine("程序集名:"+type.Assembly);
????????????Console.WriteLine("模塊名:"+type.Module);
????????????Console.WriteLine("基類(lèi)名:"+type.BaseType);
????????????Console.WriteLine("是否類(lèi):"+type.IsClass);
????????????Console.WriteLine("類(lèi)的公共成員:");
????????????MemberInfo[]?memberInfos?=?type.GetMembers();//得到所有公共成員
????????????foreach?(var?item?in?memberInfos)
????????????{
????????????????Console.WriteLine("{0}:{1}",item.MemberType,item);
????????????}
????????}
????????
????}
????class?MyClass
????{
????????public?string?m;
????????public?void?test()
????????{?}
????????public?int?MyProperty?{?get;?set;?}
????}
}
?
二、獲取程序集元數(shù)據(jù)
Assembly類(lèi)定義了一個(gè)程序集,它是一個(gè)可重用、無(wú)版本沖突并且可自我描述的公共語(yǔ)言運(yùn)行庫(kù)應(yīng)用程序構(gòu)造塊。因?yàn)槌绦蚣惺鞘褂迷獢?shù)據(jù)進(jìn)行自我描述的,所以我們就能通過(guò)其元數(shù)據(jù)得到程序集內(nèi)部的構(gòu)成。結(jié)合Assembly和反射能夠獲取程序集的元數(shù)據(jù),但是首先要將程序集裝入內(nèi)存中。可以使用Assembly類(lèi)的多種靜態(tài)Load方法加載程序集。
下面的程序顯示程序集的信息
?
Codepublic?static?void?Main()
????????{
????????????//獲取當(dāng)前執(zhí)行代碼的程序集
????????????Assembly?assem?=?Assembly.GetExecutingAssembly();
????????????Console.WriteLine("程序集全名:"+assem.FullName);
????????????Console.WriteLine("程序集的版本:"+assem.GetName().Version);
????????????Console.WriteLine("程序集初始位置:"+assem.CodeBase);
????????????Console.WriteLine("程序集位置:"+assem.Location);
????????????Console.WriteLine("程序集入口:"+assem.EntryPoint);
????????????Type[]?types?=?assem.GetTypes();
????????????Console.WriteLine("程序集下包含的類(lèi)型:");
????????????foreach?(var?item?in?types)
????????????{
????????????????Console.WriteLine("類(lèi):"+item.Name);
????????????}
????????????
????????}
?
三、動(dòng)態(tài)加載類(lèi)型
早綁定是在編譯時(shí)綁定對(duì)象類(lèi)型,而晚綁定是在運(yùn)行時(shí)才綁定對(duì)象的類(lèi)型。利用反射可以實(shí)現(xiàn)晚綁定,即動(dòng)態(tài)加載類(lèi)型,并調(diào)用他們的方法,下邊是MSDN中的一個(gè)例子,詳細(xì)的解釋信息見(jiàn)注釋
?
動(dòng)態(tài)加載類(lèi)型namespace?ConsoleApplication2
{
????public?class?Example
????{
????????private?int?factor;
????????public?Example(int?f)
????????{
????????????factor?=?f;
????????}
????????public?int?SampleMethod(int?x)
????????{
????????????Console.WriteLine("\nExample.SampleMethod({0})?executes.",?x);
????????????return?x?*?factor;
????????}
????????public?static?void?Main()
????????{
????????????//獲取當(dāng)前執(zhí)行代碼的程序集
????????????Assembly?assem?=?Assembly.GetExecutingAssembly();
????????????Console.WriteLine("Assembly?Full?Name:");
????????????Console.WriteLine(assem.FullName);
????????????//?The?AssemblyName?type?can?be?used?to?parse?the?full?name.
????????????AssemblyName?assemName?=?assem.GetName();
????????????Console.WriteLine("\nName:?{0}",?assemName.Name);
????????????Console.WriteLine("Version:?{0}.{1}",
????????????????assemName.Version.Major,?assemName.Version.Minor);
????????????Console.WriteLine("\nAssembly?CodeBase:");
????????????Console.WriteLine(assem.CodeBase);
????????????//?從程序集眾創(chuàng)建一個(gè)Example實(shí)例并且用object類(lèi)型的引用o指向它,同時(shí)調(diào)用一個(gè)輸入?yún)?shù)的構(gòu)造函數(shù)
????????????Object?o?=?assem.CreateInstance("ConsoleApplication2.Example",?false,
????????????????BindingFlags.ExactBinding,
????????????????null,?new?Object[]?{?2?},?null,?null);
????????????//構(gòu)造Example類(lèi)的一個(gè)晚綁定的方法SampleMethod??
????????????MethodInfo?m?=?assem.GetType("ConsoleApplication2.Example").GetMethod("SampleMethod");
????????????//調(diào)用剛才實(shí)例化好的Example對(duì)象o中的SampleMethod方法,傳入的參數(shù)為42
????????????Object?ret?=?m.Invoke(o,?new?Object[]?{?42?});
????????????Console.WriteLine("SampleMethod?returned?{0}.",?ret);
????????????Console.WriteLine("\nAssembly?entry?point:");
????????????Console.WriteLine(assem.EntryPoint);
????????}
????}
?
反射特性:
[Table(Name="dbo.[User]")]
public partial class User
{
當(dāng)C#編譯器發(fā)現(xiàn)這個(gè)屬性有一個(gè)特性Table時(shí),首先會(huì)把字符串Attribute添加到這個(gè)名稱(chēng)的后面,形成一個(gè)組合名稱(chēng)TableAttribute,然后在其搜索路徑的所有命名空間中搜索有相同類(lèi)名的類(lèi)。但要注意,如果該特性名結(jié)尾是Attribute,編譯器就不會(huì)把該字符串加到組合名稱(chēng)中。所有的特性都是從System.Attribute類(lèi)型上面派生的。
接著我們來(lái)看一下Table特性的定制格式
[AttributeUsageAttribute(AttributeTargets.Class, Inherited=true,AllowMultiple=false)]
public class TalbeAttribute:Attribute
{
??? 在定義類(lèi)型時(shí)使用System.AttributeUsage特性來(lái)表明這個(gè)自定義特性的使用范圍,這里使用了Class樣式,表示TableAttribute特性只能用在其它的Class類(lèi)型前面,若放置在Interface或Struct類(lèi)型前面,或者放在對(duì)象成員的前面則會(huì)出現(xiàn)編譯錯(cuò)誤。這里還是用語(yǔ)句 AllowMultiple=false 語(yǔ)句來(lái)表明對(duì)于一個(gè)類(lèi)型,該特性只能用一次,若一個(gè)Class類(lèi)型前面出現(xiàn)多個(gè)TableAttribute,則會(huì)出現(xiàn)編譯錯(cuò)誤。若設(shè)置AllowMultiple=true,則該特性可以多次定義,也就是一個(gè)Class類(lèi)型前面可以出現(xiàn)多個(gè)相同類(lèi)型的特性。不過(guò)這里我們假設(shè)一個(gè)對(duì)象只能映射到一個(gè)數(shù)據(jù)表上,沒(méi)有多重映射,因此就指明對(duì)同一個(gè)類(lèi)型該特性不能多次使用。Inherited參數(shù)設(shè)定為true,就表示應(yīng)用到類(lèi)或接口上的特性也可以自動(dòng)應(yīng)用到所派生的類(lèi)或接口上。
我們?cè)倏匆幌露ㄖ芓albeAttribute特性的完整例子:
?
?[AttributeUsageAttribute(AttributeTargets.Class,?Inherited?=?false,?AllowMultiple?=?false)]????public?class?TableAttribute?:?Attribute
????{
????????//保存表名的字段
????????private?string?_tableName;
????????public?TableAttribute()
????????{
????????}
????????public?TableAttribute(string?tableName)
????????{
????????????this._tableName?=?tableName;
????????}
????????///?<summary>
????????///?映射的表名(表的全名:模式名.表名)
????????///?</summary>
????????public?string?TableName
????????{
????????????set
????????????{
????????????????this._tableName?=?value;
????????????}
????????????get
????????????{
????????????????return?this._tableName;
????????????}
????????}
????}
?
?特性也是一個(gè)Class類(lèi)型,可以有多個(gè)構(gòu)造函數(shù),就像C#的new語(yǔ)句一樣,我們向類(lèi)型附加特性時(shí)可以使用不同的初始化參數(shù)來(lái)指明使用特性的那個(gè)構(gòu)造函數(shù)。我們附加特性時(shí)還可以使用“屬性名=屬性值”的方法來(lái)直接指明特性的屬性值。該特性中定義了一個(gè)TableName屬性,該屬性就是被修飾的對(duì)象所映射的數(shù)據(jù)庫(kù)表的名稱(chēng)。
下面我們舉一個(gè)使用特性來(lái)進(jìn)行O/RMapping的例子,也就是將對(duì)象轉(zhuǎn)化成Sql語(yǔ)句
用戶類(lèi):
User類(lèi)????[Table("User")]
????public?class?User
????{
????????[Colum("userID",?DbType?=?DbType.Int32)]
????????public?int?UserID?{?get;?set;?}
????????[Colum("UserName",?DbType?=?DbType.String)]
????????public?string?UserName?{?get;?set;?}
????}
?
表特性
?
表特性[AttributeUsageAttribute(AttributeTargets.Class,?Inherited?=?false,?AllowMultiple?=?false)]
????public?class?TableAttribute?:?Attribute
????{
????????//保存表名的字段
????????private?string?_tableName;
????????public?TableAttribute()
????????{
????????}
????????public?TableAttribute(string?tableName)
????????{
????????????this._tableName?=?tableName;
????????}
????????///?<summary>
????????///?映射的表名(表的全名:模式名.表名)
????????///?</summary>
????????public?string?TableName
????????{
????????????set
????????????{
????????????????this._tableName?=?value;
????????????}
????????????get
????????????{
????????????????return?this._tableName;
????????????}
????????}
????}
?
列特性:
?
列特性?[AttributeUsageAttribute(AttributeTargets.Property,?Inherited?=?false,?AllowMultiple?=?false)]
????public?class?ColumAttribute?:?Attribute
????{
????????private?string?_columName;
????????private?DbType?_dbType?;
????????public?ColumAttribute()
????????{
????????}
????????public?ColumAttribute(string?columName)
????????????:?this()
????????{
????????????this._columName?=?columName;
????????}
?????
????????public?ColumAttribute(string?columName,?DbType?dbType)
????????????:?this(columName)
????????{
????????????this._dbType?=?dbType;
????????}
????????//列名
????????public?virtual?string?ColumName
????????{
????????????set
????????????{
????????????????this._columName?=?value;
????????????}
????????????get
????????????{
????????????????return?this._columName;
????????????}
????????}
????????//描述一些特殊的數(shù)據(jù)庫(kù)類(lèi)型
????????public?DbType?DbType
????????{
????????????get?{?return?_dbType;?}
????????????set?{?_dbType?=?value;?}
????????}
????}
?
?
ORMHelp?public?class?ORMHelp
????{
????????public?void?Insert(object?table)
????????{
????????????Type?type?=?table.GetType();
????????????//定義一個(gè)字典來(lái)存放表中字段和值的對(duì)應(yīng)序列
????????????Dictionary<string,?string>?columValue?=?new?Dictionary<string,?string>();
????????????StringBuilder?SqlStr=new?StringBuilder();
????????????SqlStr.Append("insert?into?");
????????????//得到表名子
????????????TableAttribute?temp?=?(TalbeAttribute)type.GetCustomAttributes(typeof(TalbeAttribute), false).First();
????????????SqlStr.Append(temp.TableName);
????????????SqlStr.Append("(");
????????????PropertyInfo[]?Propertys=type.GetProperties();
????????????foreach?(var?item?in?Propertys)
????????????{
????????????????object[]?attributes?=?item.GetCustomAttributes(false);
????????????????foreach?(var?item1?in?attributes)
????????????????{
????????????????????//獲得相應(yīng)屬性的值
???????????????????string?value=?table.GetType().InvokeMember(item.Name,?System.Reflection.BindingFlags.GetProperty,?null,?table,?null).ToString();
????????????????????ColumAttribute?colum?=?item1?as?ColumAttribute;
????????????????????if?(colum?!=?null)
????????????????????{
????????????????????????columValue.Add(colum.ColumName,value);
????????????????????}
????????????????}
????????????}
????????????//拼插入操作字符串
????????????foreach?(var?item?in?columValue)
????????????{
????????????????SqlStr.Append(item.Key);
????????????????SqlStr.Append(",");
????????????}
????????????SqlStr.Remove(SqlStr.Length-1,?1);
????????????SqlStr.Append(")?values('");
????????????foreach?(var?item?in?columValue)
????????????{
????????????????SqlStr.Append(item.Value);
????????????????SqlStr.Append("','");
????????????}
????????????SqlStr.Remove(SqlStr.Length?-?2,?2);
????????????SqlStr.Append(")");
????????????Console.WriteLine(SqlStr.ToString());
????????}
????}
SqlStr中的內(nèi)容為insert into User(userID,UserName) values('1','lfm')
前端使用代碼:
?
前端代碼static?void?Main(string[]?args)
????????{
????????????ORMHelp?o?=?new?ORMHelp();
????????????User?u?=?new?User()?{?UserID=1,UserName="lfm"};
????????????o.Insert(u);
????????}
?
應(yīng)用
?
例子這個(gè)東西其實(shí)挺難弄得,弄個(gè)簡(jiǎn)單的,雖然能說(shuō)明問(wèn)題但卻容易讓人覺(jué)得沒(méi)實(shí)用價(jià)值,弄個(gè)有實(shí)用價(jià)值卻又往往牽扯很多別的技術(shù)甚至牽扯很多業(yè)務(wù)邏輯,看起來(lái)很復(fù)雜很難懂。在這里我盡量追求幾個(gè)有實(shí)用價(jià)值又不復(fù)雜的例子。
1、使用反射通過(guò)讀取配置文件來(lái)動(dòng)態(tài)的創(chuàng)建相關(guān)類(lèi)的對(duì)象
我們先來(lái)看看Main函數(shù)和需要?jiǎng)討B(tài)加載的對(duì)象在同一個(gè)程序集的情況
結(jié)構(gòu)圖:
接口
?
?
接口interface?ILog
????{
????????bool?Write(string?message);
????????bool?Write(Exception?ex);
????}
?
?
?
?
TextFileLogclass?TextFileLog?:?ILog
????{
????????public?bool?Write(string?message)
????????{
????????????string?fileDir?=?ConfigurationManager.AppSettings["LogTarget"].ToString();
????????????using?(StreamWriter?w?=?File.AppendText(fileDir))
????????????{
????????????????//?w.Write("?Log?Entry?:?");
????????????????w.WriteLine("發(fā)生時(shí)間{0}",?DateTime.Now.ToLocalTime().ToString());
????????????????w.WriteLine("日志內(nèi)容為:{0}",?message);
????????????????w.WriteLine("-------------------------------");
????????????????//?Update?the?underlying?file.
????????????????w.Flush();
????????????????w.Close();
????????????}
????????????return?true;
????????}
????????public?bool?Write(Exception?ex)
????????{
????????????Write(ex.Message);
????????????return?true;
????????}
????}
?
?
?
?
XmlFileLogclass?XmlFileLog?:?ILog
????{
????????public?bool?Write(string?message)
????????{
????????????string?xmlFilePath?=?ConfigurationManager.AppSettings["LogTarget"].ToString();
????????????if?(File.Exists(xmlFilePath))
????????????{
????????????????XmlDocument?doc?=?new?XmlDocument();
????????????????doc.Load(xmlFilePath);
????????????????XmlDocumentFragment?docFrag?=?doc.CreateDocumentFragment();
????????????????XmlNode?nod?=?doc.SelectSingleNode("Logs");
????????????????docFrag.InnerXml?=?"<Log><Time>"?+?DateTime.Now.ToLocalTime().ToString()
????????????????????+?"</Time><Message>"?+?message?+?"</Message></Log>";
????????????????nod.AppendChild(docFrag);
????????????????doc.Save(xmlFilePath);
????????????????return?true;
????????????}
????????????else
????????????{
????????????????XmlWriterSettings?settings?=?new?XmlWriterSettings();
????????????????settings.Indent?=?true;?????//設(shè)置縮進(jìn)???????
????????????????settings.ConformanceLevel?=?ConformanceLevel.Auto;
????????????????settings.IndentChars?=?"?";
????????????????settings.OmitXmlDeclaration?=?false;
????????????????using?(XmlWriter?writer?=?XmlWriter.Create(xmlFilePath,?settings))
????????????????{
????????????????????//Start?writing?the?XML?document
????????????????????writer.WriteStartDocument(false);
????????????????????//Start?with?the?root?element
????????????????????writer.WriteStartElement("Logs");
????????????????????writer.WriteStartElement("Log");
????????????????????writer.WriteStartElement("Time");
????????????????????writer.WriteString(DateTime.Now.ToLocalTime().ToString());
????????????????????writer.WriteEndElement();
????????????????????writer.WriteStartElement("Message");
????????????????????writer.WriteString(message);
????????????????????writer.WriteEndElement();
????????????????????writer.WriteEndElement();
????????????????????writer.WriteEndDocument();
????????????????????//Flush?the?object?and?write?the?XML?data?to?the?file
????????????????????writer.Flush();
????????????????????return?true;
????????????????}
????????????}
????????}
????????public?bool?Write(Exception?ex)
????????{
????????????Write(ex.Message);
????????????return?true;
????????}
????}
?
?
?
?
App.config配置<?xml?version="1.0"?encoding="utf-8"??>
<configuration>
??<appSettings>
????<add?key="LogType"?value="LogClassLibrary.TextFileLog"/>
????<!--
????本程序集配置
????<add?key="LogType"?value="ConsoleApplication2.Log例子.TextFileLog"/>
????-->
????<!--?XmlFileLog??TextFileLog-->
????<add?key="LogTarget"?value="c:\log.txt"/>
??</appSettings>
</configuration>
?
?
?
?
主程序?public?static?void?Main()
????????{
????????????#region?同程序集下
????????????System.Type?type?=?System.Type.GetType(ConfigurationManager.AppSettings["LogType"].ToString());
????????????ILog?log?=?(ILog)Activator.CreateInstance(type);
????????????log.Write(new?Exception("異常測(cè)試"));
????????????#endregion
????????}
?
?
如果在不同的程序集下,那主函數(shù)和配置會(huì)略有不同
?
?
不同程序集主函數(shù)?public?static?void?Main()
????????{
????????????#region?不同程序集
????????????string?assemblyPath?=?Path.Combine(Environment.CurrentDirectory,?"LogClassLibrary.dll");
????????????Assembly?a?=?Assembly.LoadFrom(assemblyPath);
????????????Type?type?=?a.GetType(ConfigurationManager.AppSettings["LogType"].ToString());
????????????LogClassLibrary.ILog?log?=?(LogClassLibrary.ILog)type.InvokeMember(null,BindingFlags.CreateInstance,null,null,null);
????????????log.Write(new?Exception("異常測(cè)試"));
????????????#endregion
????????}
?
?
這部分源碼下載
源碼下載
2、插件編程技術(shù)
插件是指遵循一定的接口規(guī)范、可以動(dòng)態(tài)加載和運(yùn)行的程序模塊。從上面的例子可以看出,通過(guò)反射可以非常方便的動(dòng)態(tài)加載程序集。因此,利用反射的動(dòng)態(tài)加載代碼能力,可以很容易的實(shí)現(xiàn)插件。插件編程的要點(diǎn)是使用接口來(lái)定義插件的功能特征。插件的宿主程序通過(guò)接口來(lái)確認(rèn)、裝載和執(zhí)行插件的功能,實(shí)現(xiàn)插件功能的所有類(lèi)都必須實(shí)現(xiàn)定義插件的接口。
這里只是選貼一部分代碼,詳細(xì)分析請(qǐng)看源碼
結(jié)構(gòu)圖
?
接口部分
?
?
接口public?interface?IHost
????{
????????List<ILog>?Plugins?{?get;?}
????????int?LoadPlugins(string?path);
????????ILog?GetLog(string?name);
????}
?public?interface?ILog
????{
????????bool?Write(string?message);
????????bool?Write(Exception?ex);
????}
?
?
宿主實(shí)現(xiàn)
?
?
宿主實(shí)現(xiàn)?public?class?Host?:?IHost
????{
????????private?List<ILog>?plugins?=?new?List<ILog>();
????????#region?IHost?成員
????????public?List<ILog>?Plugins
????????{
????????????get?{?return?plugins;?}
????????}
????????public?int?LoadPlugins(string?path)
????????{
????????????string[]?assemblyFiles?=?Directory.GetFiles(path,?"*.dll");
????????????foreach?(var?file?in?assemblyFiles)
????????????{
????????????????Assembly?assembly?=?Assembly.LoadFrom(file);
????????????????foreach?(var?type?in?assembly.GetExportedTypes())
????????????????{
????????????????????if?(type.IsClass?&&?typeof(ILog).IsAssignableFrom(type))
????????????????????{
????????????????????????ILog?plugin?=?Activator.CreateInstance(type)?as?ILog;
????????????????????????plugins.Add(plugin);
????????????????????}
????????????????}
????????????}
????????????return?plugins.Count;
????????}
????????public?ILog?GetLog(string?name)
????????{
????????????foreach?(var?item?in?plugins)
????????????{
????????????????if?(item.GetType().ToString()==name)
????????????????{
????????????????????return?item;
????????????????}
????????????????
????????????}
????????????return?null;
????????}
????????#endregion
????}
?
?
ILog的實(shí)現(xiàn)和上例基本一樣,請(qǐng)參考
主程序代碼
?
?
主程序代碼static?void?Main(string[]?args)
????????{
????????????Host.Host?host?=?new?Host.Host();
????????????host.LoadPlugins(".");
????????????InterfaceLayer.ILog?log?=?host.GetLog(ConfigurationManager.AppSettings["LogType"].ToString());
????????????log.Write(new?Exception("異常測(cè)試"));
????????}
?
?
插件編程源碼下載源碼下載
3、分析對(duì)象,得到對(duì)象中的屬性值
大家使用應(yīng)都用過(guò)asp.net中的DropdownList,在綁定其值的時(shí)候絕大多數(shù)情況下我們做的都是同樣的事情,獲得數(shù)據(jù)源,根據(jù)數(shù)據(jù)源中的某些列綁定控件,下邊我們來(lái)說(shuō)說(shuō)通用情況的處理方式。我們只需要提供數(shù)據(jù)集合,以及需要綁定到控件的兩個(gè)屬性(text,value)名即可。
?
?
Code轉(zhuǎn)載于:https://www.cnblogs.com/strivers/archive/2010/11/27/1889744.html
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