How to reference .net 4 class library from .net core

Question

I am using VS 2015 Update 3. I added reference in my .net core project but I can't access to methods/members/classes.

Answer 1

Since you have added Service4 class library reference only in .NET 4.0 dependencies section (refer below snapshot), You need to use Conditional Compilation.

To access, Service4 members, you need to do like this-

#if NET40 
    Service4.Test.PrintHi(); 
#endif

These are list of preprocessor symbols used in #if directives:

.NET Framework 2.0 --> NET20

.NET Framework 3.5 --> NET35

.NET Framework 4.0 --> NET40

.NET Framework 4.5 --> NET45

.NET Framework 4.5.1 --> NET451

.NET Framework 4.5.2 --> NET452

.NET Framework 4.6 --> NET46

.NET Framework 4.6.1 --> NET461

.NET Framework 4.6.2 --> NET462

.NET Standard 1.0 --> NETSTANDARD1_0

.NET Standard 1.1 --> NETSTANDARD1_1

.NET Standard 1.2 --> NETSTANDARD1_2

.NET Standard 1.3 --> NETSTANDARD1_3

.NET Standard 1.4 --> NETSTANDARD1_4

.NET Standard 1.5 --> NETSTANDARD1_5

.NET Standard 1.6 --> NETSTANDARD1_6

For more details, refer this article