转载：程序集的问题
一直以来，学习c#有个问题困惑着我。到底是程序集，用vs.net生成的一个项目就是一个程序集吗？直到几天，我终于弄清楚了。谢谢，c# Primer Plus这本书，有它真好。
一个.cs的源文件构成了一个编译单元，而一个或几个编译单元可以生成一个程序集。程序集可以是.dll文件，也可以是.exe文件。一个编译单元可以引用程序集，来生成另外一个程序集。
如果这里有两个编译单元：
类1(a.cs)：
<div style="padding: 4px 5.4pt; width: 98%;"> 1http://www.cnblogs.com/Images/OutliningIndicators/None.gifusing System;
2http://www.cnblogs.com/Images/OutliningIndicators/None.gifnamespace a1
3http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gifhttp://www.cnblogs.com/Images/dot.gif{
4http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gifinternal class myClass
5http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gifhttp://www.cnblogs.com/Images/dot.gif{
6http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gifpublic void print()
7http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gifhttp://www.cnblogs.com/Images/dot.gif{
8http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gifConsole.WriteLine("this is myClass");
9http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif}
10http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif}
11http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif}
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