I have a Solution with a large number of associated .csproj files.
Each .csproj file has a <Target Name="PublishQA">.... 
The build fails when I try to compile the whole solution:
> msbuild mysolution.sln /t:PublishQA`
"c:\myproj.sln" (publishqa target) (1) ->
  c:\myproj.sln.metaproj : error MSB4057: The target "PublishQA" does not exist in the project. [c:\myproj.sln]
When I build the .csproj project directly, it builds just fine.
How do I tell msbuild to pass the target to the project files???
As a case you can create seperate targets file which explicitly builds your solution,
<!-- mytargets.targets file -->
<Project ToolsVersion="4.0" 
         xmlns="http://schemas.microsoft.com/developer/msbuild/2003"  
         DefaultTargets="MyTargets" 
         InitialTargets="MyTargets">
    <Target Name="MyTargets">
       <MSBuild Projects="MySolution.sln" />
    </Target>
</Project>
So now you should be able just calling it like
msbuild.exe mytargets.targets
来源:https://stackoverflow.com/questions/8451799/pass-custom-msbuild-target-from-solution-to-project