Possible to alias .NET namespaces in app.config?

Question

ASP.NET has a feature that allows you to declare implicitly used namespaces in the web.config.

 
  
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Answer 1

No. Namespaces are required at compile time. It's only scenarios where the compilation is done "late" (as in ASP.NET) where this makes any sense.

What would it even mean to add a namespace at execution time, if the code has already been compiled?

Are you really just after the option to avoid writing a bunch of using directives at the top of each file? If so, and if C# supported it, that would be in the project properties (which are about compilation, not execution). However, C# doesn't support that - the only imported namespaces are the ones specified by using directives in the current file.

I think VB has the idea of "default namespaces" but C# definitely doesn't. Personally I think that's a good thing. (You might also want to look at this question. I don't know whether it's effectively a duplicate or not, as your intention isn't clear at the moment.)