Portable Executable File Format
PE Format 微软官方的
What is a .PE file in the .NET framework? [closed]
The PE file you are talking about is the "Portable Executable" format. Almost every EXE and DLL on the Windows platform is formatted in PE format. To answer your question, it's a general format and every assembly generated after compilation of your project will be a PE file. You will have a PE file for every .NET project you compile. You can read more about it here: http://en.wikipedia.org/wiki/Portable_Executable
And no, not every class in a project results in a new DLL. Every project in a solution will result in a new DLL or Executable.
A .NET assembly viewer
For PE/.NET file format information, I would suggest reading sections 21-24 of ECMA-335 Partition II, available all over the web. Inside Microsoft .NET IL Assembler is also a good book, despite the occasional inaccuracy.
If you want to go further and understand the actual CIL instructions in your assembly, Compiling for the .NET Common Language Runtime is an excellent book.
If you want to examine your binary files in comfort, may I humbly plug my own AXE program.
http://jilc.sourceforge.net/ecma_p2_cil.shtml
Anatomy of a .NET Assembly red-gate上的博客
Anatomy of a .NET Assembly – PE Headers
Anatomy of a .NET Assembly – CLR metadata 1
Anatomy of a .NET Assembly – CLR metadata 2
大概有10篇左右的文章，可以用以下语法，搜索
Anatomy of a .NET Assembly site:https://www.red-gate.com/simple-talk