什么是两者之间的区别是什么？我们能否用它们可以互换？

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

推荐答案

基类库（BCL）是从字面上说，该基地。它包含了基本的，基本的类型，如 System.String 和的System.DateTime 。

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

框架类库（FCL）是更广泛​​的库，它包含的全部：ASP.NET，WinForms的，在XML堆栈，ADO.NET等等。可以说，整箱包括BCL。

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.