How do I exclude types and methods from being covered by dotCover in TeamCity?

Ok, Martin, I figured it out! It only took an hour of randomly poking at the filter syntax... when the documentation says to add a filter like this

+:myassembly=*;type=*;method=***

They really mean this... where anything in <> is replaced entirely by you and anything else is a literal

+:<myassembly>;type=<filter>;method=<filter>

So, the filter I wanted was to include a single assembly (from a bunch of assemblies) and then exclude a few namespaces in that assembly. I wrote

+:Omnyx.Scanner
-:Omnyx.Scanner;type=Omnyx.Scanner.Simulation.*
-:Omnyx.Scanner;type=Omnyx.Scanner.ToolsCommon.*

Take a look at the Coverage Analysis from the Command Line - Applying filters page. It looks like you can set up exclusions in the Filters section, similar to how you excluded entire assemblies.

Let's say you want to ignore a method called DoStuff contained in a class MyStuff, which is in the MyAwesomeAssembly library. Then your dotCover XML should look something like this:

<Filters>
  <ExcludeFilters>
     <FilterEntry>
       <ModuleMask>MyAwesomeAssembly</ModuleMask>
       <ClassMask>MyStuff</ClassMask>
       <FunctionMask>DoStuff</FunctionMask>
     </FilterEntry>
  </ExcludeFilters>
</Filters>

Disclaimer: I don't use dotCover, so I'm not 100% sure if this will actually work.