在两个不同的程序集中，两个具有相同名称的类可以位于相同的名称空间中吗？

Question

I have two different assemblies: Assembly1 and Assembly2 . Both assemblies use the same namespace SoftwareDrivers . Now, I have two implementations of a class that has identical functionality, just different implementation and dependencies that tie one implementation to Assembly1 and the other to Assembly2 ; I'll call this class PackageWriter .

It is possibly, and likely, some projects will need to reference both assemblies, so I anticipate there will be an issue with resolving which PackageWriter to use in that scenario. Is this the case? If so, is the only way to resolve this issue, without changing the structure of the project, to change the name of PackageWriter ?c

Answer 1

Yes they can. If both assemblies are referenced, you will receive an error similar to this:

error CS0433: The type 'Testing' exists in both 'MyApp.Domain, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' and 'MyApp.Infrastructure, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'

Note, you should never purposefully put yourself in this situation. However, if you for some reason find yourself in a situation where you have to handle this:

Every assembly has an "alias" in .NET and by default it is global . This is usually invisible to the day to day programmer. You can change the alias by clicking on the reference and changing the Alias in Properties. You would then reference it by having extern alias myalias at the top of your file, and the actual class referenced like this myalias::MyApp.Testing

This is perhaps needed when running 2 versions of an API or similar, although I maintain to avoid this if at all possible.

For more detail, see this answer .

Answer 2

如果它在同一个命名空间中，则否，除非您将其声明为partial类