c# - How to set .NET Core in #if statement for compilation

Question

I created a multi-targeted framework project. I use something like this:

  #if NET40
    Console.WriteLine("Hello from .NET Core 4");
  #endif

But I can't find a wildcard for .NET Core. I tried:

   #if NETCOREAPP1.0
     Console.WriteLine("Hello from .NET Core");
   #endif

But it is not valid statement.

Answer 1

You need an underscore, _, instead of a point:

NETCOREAPP1_0 or the more recent NETCOREAPP1_1 and NETCOREAPP2_0

The documentation for Target frameworks in SDK-style projects includes a list for the different preprocessor symbols.

.NET Framework

NETFRAMEWORK, NET48, NET472, NET471, NET47, NET462, NET461, NET46, NET452, NET451, NET45, NET40, NET35, NET20

.NET Standard

NETSTANDARD, NETSTANDARD2_1, NETSTANDARD2_0, NETSTANDARD1_6, NETSTANDARD1_5, NETSTANDARD1_4, NETSTANDARD1_3, NETSTANDARD1_2, NETSTANDARD1_1, NETSTANDARD1_0

.NET 5+ and .NET Core

NET, NET6_0, NET6_0_ANDROID, NET6_0_IOS, NET6_0_MACOS, NET6_0_MACCATALYST, NET6_0_TVOS, NET6_0_WINDOWS, NET5_0, NETCOREAPP, NETCOREAPP3_1, NETCOREAPP3_0, NETCOREAPP2_2, NETCOREAPP2_1, NETCOREAPP2_0, NETCOREAPP1_1, NETCOREAPP1_0

Mono

For Mono you can usually use the NetFramework monikers known by your version of Mono. For instance, Mono 6.12 includes all NetFramework versions from 2.0 to 4.8. But if you must recognise Mono per se, then MONO and __MonoCS__ should both be defined.