How to declare a friend assembly?
You need to sign both assemblies, because effectively both assemblies reference each other. You have to put the public key in the InternalsVisibleTo attribute. For example, in Protocol Buffers I use: [assembly:InternalsVisibleTo(“Google.ProtocolBuffers.Test,PublicKey=”+ “00240000048000009400000006020000002400005253413100040000010001008179f2dd31a648″+ “2a2359dbe33e53701167a888e7c369a9ae3210b64f93861d8a7d286447e58bc167e3d99483beda”+ “72f738140072bb69990bc4f98a21365de2c105e848974a3d210e938b0a56103c0662901efd6b78″+ “0ee6dbe977923d46a8fda18fb25c65dd73b149a5cd9f3100668b56649932dadd8cf5be52eb1dce”+ “ad5cedbf”)] The public key is retrieved by running sn -Tp path\to\test\assembly.dll Alternatively, get it from the .snk file: sn … Read more