blocks|key|5512309|text|基类库(BCL)从字面上讲就是基类。它包含基本的基本类型，如System.String和System.DateTime。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5512310|框架类库(FCL)是一个更宽泛的库，它包含了:+ASP.NET、WinForms、XML、ADO.NET等等。您可以说FCL包括BCL。|5512311|entityMap^0|U|D|18|F|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

The Base Class Library (BCL) is literally that, the base. It contains basic, fundamental types like <code>System.String</code> and <code>System.DateTime</code>.

The Framework Class Library (FCL) is the wider library that contains the totality: ASP.NET, WinForms, the XML stack, ADO.NET and more. You could say that the FCL includes the BCL.

blocks|key|1984441|text|BCL|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1984442|BCL是一个.NET框架库，它是C#运行时库的标准，也是公共语言基础结构标准库之一。BCL提供了表示内置CLI数据类型、基本文件访问、集合、自定义属性、格式化、安全属性、I/O流、字符串操作等的类型。|1984443|1984444|FCL|1984445|1984446|，.NET框架类库，正如它的名字所暗示的:一个类和其他类型的库，开发人员可以使用它来简化他们的工作。虽然这些类本身是用C#编写的，但可以在任何CLRbased语言中使用它们|blockquote|1984447|1984448|1984449|您将对每个项目类型的FCL的某些部分使用BCL。因此可以使用System.Windows.Forms+(一个单独的库)或System.Web，其中包含来自mscorlib和System.dll的BCL|1984450|entityMap|0|LINK|mutability|MUTABLE|url|https://web.archive.org/web/20100816131838/http://en.csharp-online.net/Glossary:Definition_-_Base_Class_Library|1|https://web.archive.org/web/20091118143949/http://en.csharp-online.net/Introducing_.NET%25E2%2580%2594The_.NET_Framework_Class_Library^0|0|3|0|0|0|0|0|3|1|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@$A|11|B|12|1|13]]|C|$]]|$1|D|3|E|5|6|7|14|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|15|8|@]|9|@]|C|$]]|$1|G|3|H|5|6|7|16|8|@]|9|@$A|17|B|18|1|19]]|C|$]]|$1|I|3|-4|5|6|7|1A|8|@]|9|@]|C|$]]|$1|J|3|K|5|L|7|1B|8|@]|9|@]|C|$]]|$1|M|3|-4|5|6|7|1C|8|@]|9|@]|C|$]]|$1|N|3|-4|5|6|7|1D|8|@]|9|@]|C|$]]|$1|O|3|P|5|6|7|1E|8|@]|9|@]|C|$]]|$1|Q|3|-4|5|6|7|1F|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]|Y|$5|T|U|V|C|$W|Z]]]]

<h3><a href="https://web.archive.org/web/20100816131838/http://en.csharp-online.net/Glossary:Definition_-_Base_Class_Library" rel="noreferrer">BCL</a>:</h3>
<blockquote>
A .NET Framework library, BCL is the standard for the C# runtime library and one of the Common Language Infrastructure (CLI) standard libraries. BCL provides types representing the built-in CLI data types, basic file access, collections, custom attributes, formatting, security attributes, I/O streams, string manipulation, and more.
</blockquote>
<h3><a href="https://web.archive.org/web/20091118143949/http://en.csharp-online.net/Introducing_.NET%E2%80%94The_.NET_Framework_Class_Library" rel="noreferrer">FCL</a>:</h3>
<blockquote>
The .NET Framework class library is exactly what its name suggests: a library of classes and other types that developers can use to make their lives easier. While these classes are themselves written in C#, they can be used from any CLRbased language
</blockquote>
You'll be using the BCL with some parts of the FCL with each project type. So System.Windows.Forms (a separate library) or System.Web, with the BCL from mscorlib and System.dll

blocks|key|1609172|text|BCL代表基类库，也称为类库(CL)。BCL是框架类库(FCL)的子集。类库是与CLR紧密集成的可重用类型的集合。基类库提供了有助于执行日常操作的类和类型，例如处理字符串和原语类型、数据库连接、IO操作。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1609173|而框架类库包含了数千个用于构建不同类型应用程序的类，并提供了应用程序所需的所有基本功能和服务。FCL包括支持不同种类的应用程序的类和服务，例如|1609174|1609175|桌面应用程序、|unordered-list-item|1609176|网络应用程序(ASP.Net、MVC、WCF)、|1609177|移动应用程序、|1609178|Xbox应用程序、|1609179|windows服务等。|1609180|1609181|有关更多细节，请访问What+is+BCL/+CL+in+.Net?|1609182|​|1609183|📷|atomic|1609184|1609185|entityMap|0|LINK|mutability|MUTABLE|url|https://modernpathshala.com/Forum/Thread/Interview/7307/what-is-base-class-library|1|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/e2df5bab07640acb4ef6f81404619187.jpeg|imageAlt^0|0|3|0|0|0|0|0|0|0|0|0|A|O|0|0|0|0|1|1|0|0^^$0|@$1|2|3|4|5|6|7|1G|8|@$9|1H|A|1I|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1J|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|1K|8|@]|D|@]|E|$]]|$1|I|3|J|5|K|7|1L|8|@]|D|@]|E|$]]|$1|L|3|M|5|K|7|1M|8|@]|D|@]|E|$]]|$1|N|3|O|5|K|7|1N|8|@]|D|@]|E|$]]|$1|P|3|Q|5|K|7|1O|8|@]|D|@]|E|$]]|$1|R|3|S|5|K|7|1P|8|@]|D|@]|E|$]]|$1|T|3|-4|5|6|7|1Q|8|@]|D|@]|E|$]]|$1|U|3|V|5|6|7|1R|8|@]|D|@$9|1S|A|1T|1|1U]]|E|$]]|$1|W|3|X|5|6|7|1V|8|@]|D|@]|E|$]]|$1|Y|3|Z|5|10|7|1W|8|@]|D|@$9|1X|A|1Y|1|1Z]]|E|$]]|$1|11|3|X|5|6|7|20|8|@]|D|@]|E|$]]|$1|12|3|-4|5|6|7|21|8|@]|D|@]|E|$]]]|13|$14|$5|15|16|17|E|$18|19]]|1A|$5|1B|16|1C|E|$1D|1E|1F|-4]]]]

BCL stands for Base class library also known as Class library (CL). BCL is a subset of Framework class library (FCL). Class library is the collection of reusable types that are closely integrated with CLR. Base Class library provides classes and types that are helpful in performing day to day operation e.g. dealing with string and primitive types, database connection, IO operations.

while Framework class library contains thousands of classes used to build different types of applications and provides all the basic functionalities and services that application needs. FCL includes classes and services to support different variety of application e.g.

<ul>
<li>Desktop application,</li>
<li>Web application (ASP.Net, MVC, WCF),</li>
<li>Mobile application,</li>
<li>Xbox application,</li>
<li>windows services etc.</li>
</ul>

More details at <a href="https://modernpathshala.com/Forum/Thread/Interview/7307/what-is-base-class-library" rel="noreferrer">What is BCL/ CL in .Net?</a>

<a href="https://i.stack.imgur.com/SxbSG.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/SxbSG.jpg" alt="enter image description here"></a>

blocks|key|4094709|text|基类库(BCL)是一组核心类，用作公共语言运行库的基本API。mscorlib.dll中的类以及System.dll和System.core.dll中的一些类被认为是BCL的一部分。它包括System、System.Diagnostics、System.Globalization、System.Resources、System.Text、System.Runtime.Serialization和System.Data等名称空间中的类。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4094710|框架类库(FCL)是BCL类的超集，它引用.NET框架附带的整个类库。它包括一组扩展的库，包括Windows+Forms、ADO.NET、ASP.NET、Language+Integrated+Query、Windows+Presentation+Foundation和Windows+Communication+Foundation等。|4094711|所以它们是有区别的，你不能把它们互换使用。|4094712|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|$]]

The Base Class Library (BCL) is the core set of classes that serve as the basic API of the Common Language Runtime. The classes in mscorlib.dll and some of the classes in System.dll and System.core.dll are considered to be a part of the BCL. It includes the classes in namespaces like System , System.Diagnostics , System.Globalization, System.Resources , System.Text , System.Runtime.Serialization and System.Data etc.

The Framework Class Library (FCL) is a superset of the BCL classes and refers to the entire class library that ships with .NET Framework. It includes an expanded set of libraries, including Windows Forms, ADO.NET, ASP.NET, Language Integrated Query, Windows Presentation Foundation, Windows Communication Foundation among others.

So there are differences and you must not use those interchangeably.

blocks|key|4094597|text|BCL是FCL的子集。BCL遵守公共语言基础结构的ECMA规范。然后，微软添加了它们的所有优点，如数据和xml，并将其称为框架类库。基本上，他们把BCL改成了11！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4094598|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|$]]

The BCL is a subset of the FCL. BCL honors the ECMA specification for the common language infrastructure. Then Microsoft added all their goodness like data and xml and called it the Framework Class Library. Basically they took the BCL and made it go to 11!

blocks|key|5512425|text|以下内容摘自“C#播放器指南”一书。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5512426|BCL包含所有的内置类型、数组、异常、数学库、基本文件I/O、安全性、集合、反射、联网、字符串操作、线程等等。虽然不是一个完美的指南，但一般规则是任何以System开头的名称空间都是BCL的一部分。|5512427|除了BCL之外，微软还随.NET框架提供了更多的类。通常，这些附加内容涵盖了广泛的功能领域，例如数据库访问或图形用户界面(Windows窗体或WPF)。包括BCL在内的整个集合被称为框架类库，或FCL。在随意的讨论中，有时人们会交替使用FCL和BCL，这不是严格意义上的正确，但它可能对大多数事情都足够好。|5512428|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|$]]

The following is cited from the book "The C# Player's Guide".

The BCL contains all of the built-in types, arrays, exceptions, math libraries, basic File I/O, security,
collections, reflection, networking, string manipulation, threading, and more. While not a perfect
guide, a general rule is that any namespace that start with System is a part of the BCL.

Beyond the BCL, there are many more classes that Microsoft ships with the .NET Framework. In
general, these additional things cover broad functional areas, such as database access or graphical
user interfaces (Windows Forms or WPF). This entire collection, including the BCL, is called the
Framework Class Library, or FCL. In casual discussion, sometimes people use FCL and BCL
interchangeably, which isn’t strictly correct, but it is perhaps good enough for most things.

What's the difference between the two? Can we use them interchangeably?

BCL (Base Class Library) vs FCL (Framework Class Library)

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。

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