Question

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Is it possible to declare a partial class in two projects

Say In my project solution, I have two project, ProjectA and ProjectB.
ProjectA created: MyClassA

Then ProjectB has ProjectA referenced.
Is it possible to create a partial class for ProjectA’s MyClassA in ProjectB?

My Project A’s MyClassA:

namespace TestPartial
{
    public class MyClassA
    {
        public string MyName { get; set; }
    }
}

My Project B’s MyClassB:

namespace TestPartial
{
    public partial class MyClassA
    {
        public DateTime BirthDate { get; set; }
    }

}

But obviously both properties doesn’t merge…. So I guess is only work if they are in same project only? Or there is some workaround for it?

Answer 1

No, partial classes cannot span multiple project/assemblies.

From MSDN Partial Class Definitions – Restrictions
:

All partial-type definitions meant to be parts of the same type must
be defined in the same assembly and the same module (.exe or .dll
file). Partial definitions cannot span multiple modules.