blocks|key|799948|text|反射允许您以编程方式加载程序集，获取程序集中所有类型的列表，获取这些类型中所有属性和方法的列表，等等。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|799949|举个例子：|799950|myobject.GetType().GetProperty("MyProperty").SetValue(myobject,+"wicked!",+null)|code-block|syntax|javascript|799951|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Reflection lets you programmatically load an assembly, get a list of all the types in an assembly, get a list of all the properties and methods in these types, etc.

As an example:

<pre><code>myobject.GetType().GetProperty("MyProperty").SetValue(myobject, "wicked!", null)
</code></pre>

blocks|key|5349893|text|反射是如何探索不同类型的内部结构，而无需正常访问(即。私有的、受保护的等成员)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5349894|它还用于动态加载DLL并访问其中定义的类型和方法，而无需将它们静态编译到您的项目中。|5349895|简而言之:反射是您的工具包，用于窥探一段代码的内部。|5349896|至于你为什么要使用它，它通常只在复杂的情况下使用，或者代码分析。另一个常见的用途是将预编译的插件加载到项目中。|5349897|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

Reflection is how you can explore the internals of different Types, without normally having access (ie. private, protected, etc members).

It's also used to dynamically load DLL's and get access to types and methods defined in them without statically compiling them into your project.

In a nutshell: Reflection is your toolkit for peeking under the hood of a piece of code.

As to why you would use it, it's generally only used in complex situations, or code analysis. The other common use is for loading precompiled plugins into your project.

blocks|key|5349973|text|它允许对象的内部结构反映给外部世界(使用所述对象的代码)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5349974|静态类型语言如C#+(和Java)的一个实际用途是允许在运行时通过字符串调用方法/成员(例如，方法的名称-也许您不知道在编译时将使用的方法的名称)。|5349975|在动态语言的上下文中，我没有听说过这个术语(因为通常你不会担心上面的问题)，除了迭代方法/成员列表等之外……|5349976|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

It allows the internals of an object to be reflected to the outside world (code that is using said objects). 

A practical use in statically typed languages like C# (and Java) is to allow invocation of methods/members at runtime via a string (eg the name of the method - perhaps you don't know the name of the method you will use at compile time). 

In the context of dynamic languages I haven't heard the term as much (as generally you don't worry about the above), other then perhaps to iterate through a list of methods/members etc...

blocks|key|3940341|text|反射是.Net在运行时操作或提取程序集、类或方法信息的方法。例如，您可以在运行时创建一个类，包括它的方法。正如一氧化碳所说，反射用于动态加载程序集作为插件，或者在预先的情况下，它用于创建针对.Net的.Net编译器，如IronPython。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3940342|更新的：您可以参考有关metaprogramming的主题及其相关主题以了解更多详细信息。|3940343|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Metaprogramming^0|8|3|0|0|3|B|F|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@$9|V|A|W|1|X]]|E|$]]|$1|H|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

Reflection is .Net's means to manipulate or extract information of an assembly, class or method at run time. For example, you can create a class at runtime, including it's methods. As stated by monoxide, reflection is used to dynamically load assembly as plugins, or in advance cases, it is used to create .Net compiler targeting .Net, like IronPython. 

Updated: You may refer to the topic on <a href="http://en.wikipedia.org/wiki/Metaprogramming" rel="nofollow noreferrer">metaprogramming</a> and its related topics for more details.

blocks|key|799975|text|当你在.NET+(ASP.NET、Windows+Forms、命令行、类库等)中构建任何程序集时，也会在程序集中创建一些元数据“定义表”，其中存储了与您在代码中编写的类型、字段和方法相对应的方法、字段和类型的信息。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|799976|.NET中System.Reflection名称空间中的类允许您枚举和交互这些表，为您查询和访问这些表中的项提供了一个“对象模型”。|799977|反射的一个常见用法是为应用程序提供可扩展性(插件)。例如，反射允许您从文件路径动态加载程序集，在其类型中查询特定的有用类型(如应用程序可以调用的接口)，然后实际调用此外部程序集上的方法。|799978|自定义属性也与反射密切相关。例如，测试单元测试框架允许您通过将NUnit+{TestFixture]属性添加到您自己的代码中来指示测试类和测试方法。|799979|但是，NUnit测试运行器必须使用反射来加载程序集，搜索所有出现的具有测试属性的方法，然后实际调用您的测试。|799980|这大大简化了它，但是它为您提供了一个很好的实际示例，说明在哪些情况下反射是必不可少的。|799981|反射当然是强大的，但是要注意，它允许您完全忽略面向对象编程中访问修饰符(封装)的基本概念。|799982|例如，您可以很容易地使用它来检索类中的Private方法列表并实际调用它们。出于这个原因，您需要仔细考虑如何以及在何处使用它，以避免绕过封装和非常紧密耦合(坏)的代码。|799983|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|V|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|W|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|X|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|Y|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|Q|$]]

When you build any assembly in .NET (ASP.NET, Windows Forms, Command line, class library etc), a number of meta-data "definition tables" are also created within the assembly storing information about methods, fields and types corresponding to the types, fields and methods you wrote in your code. 

The classes in System.Reflection namespace in .NET allow you to enumerate and interate over these tables, providing an "object model" for you to query and access items in these tables.

One common use of Reflection is providing extensibility (plug-ins) to your application. For example, Reflection allows you to load an assembly dynamically from a file path, query its types for a specific useful type (such as an Interface your application can call) and then actually invoke a method on this external assembly.

Custom Attributes also go hand in hand with reflection. For example the NUnit unit testing framework allows you to indicate a testing class and test methods by adding [Test] {TestFixture] attributes to your own code. 

However then the NUnit test runner must use Reflection to load your assembly, search for all occurrences of methods that have the test attribute and then actually call your test.

This is simplifying it a lot, however it gives you a good practical example of where Reflection is essential.

Reflection certainly is powerful, however be ware that it allows you to completely disregard the fundamental concept of access modifiers (encapsulation) in object oriented programming. 

For example you can easily use it to retrieve a list of Private methods in a class and actually call them. For this reason you need to think carefully about how and where you use it to avoid bypassing encapsulation and very tightly coupling (bad) code.

blocks|key|3094621|text|反射是检查应用程序的元数据的过程。换句话说，在阅读属性时，您已经了解了反射提供的一些功能。反射使应用程序能够收集有关其自身的信息，并根据该信息采取行动。反射比正常执行静态代码要慢。但是，它可以为您提供静态代码无法提供的灵活性|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3094622|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Reflection is the process of inspecting the metadata of an application. In other words,When reading attributes, you’ve already looked at some of the functionality that reflection
offers. Reflection enables an application to collect information about itself and act on this in-
formation. Reflection is slower than normally executing static code. It can, however, give you 
a flexibility that static code can’t provide

I am VERY new to ASP.NET. I come from a VB6 / ASP (classic) / SQL Server 2000 background. I am reading a lot about Visual Studio 2008 (have installed it and am poking around). I have read about "reflection" and would like someone to explain, as best as you can to an older developer of the technologies I've written above, what exactly Reflection is and why I would use it... I am having trouble getting my head around that. Thanks!

What is Reflection?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

文章

问答

视频

教程

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云智能顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

EdgeOne AI 安全实战专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋

腾讯云AI代码助手

云原生构建

TAPD 敏捷项目管理

Cloud Studio

SDK中心

API中心

命令行工具

功能1上新10个字符

功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符。

功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符。

功能5描述100个字符功能5描述100个字符功能5描述100个字符功能5描述100个字符功能5描述100个字符功能5描述100个字符

功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符

功能4上新

文章&问答评论现已支持表情

全新交互，全新视觉，新增快捷键、悬浮工具栏、高亮块等功能并同时优化现有功能，全面提升创作效率和体验

社区富文本编辑器全新改版！诚邀体验～ 

精选全网热门MCP server，让你的AI更好用 🚀

💥开发者 MCP广场重磅上线！

涵盖代码开发、场景应用、自动测试全流程，助你从零构建专属AI助手

一站式MCP教程库，解锁AI应用新玩法

聚焦“写作效率、视觉美观与运行性能”三方面进行全面升级，为您提供更高效、稳定的创作环境

社区富文本&Markdown编辑器全新改版上线，欢迎大家体验!

诚挚邀请您参与本次调研，分享您的真实使用感受与建议。您的反馈至关重要，感谢您的支持与参与！

社区新版编辑器体验调研

我对ASP.NET非常陌生，我来自VB6 / ASP (经典)/ SQL Server2000背景。我读了很多关于Visual Studio2008的文章(我已经安装了它，并在四处摸索)。我读过关于“反射”的文章，并希望有人能尽可能地向我上面写过的技术的老开发者解释一下，反射到底是什么，以及我为什么要使用它……我很难想明白这一点。谢谢!

问什么是反射？
EN

回答 6

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问什么是反射？EN

回答 6

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问什么是反射？
EN