10

With the new MsBuild version it's really easy to target multiple frameworks and framework versions in .csproj project:

<TargetFrameworks>net40;net45;net461;netcoreapp1.1</TargetFrameworks>

Now, how do I get a constant defined for each of them so that I can have certain code only be part of e.g. netcoreapp1.1 pass and not full framework compilation?

I'd like to be able to add a preprocessor directive like this one:

#if NET_CORE
    // some code
#endif

And the same for full .NET Framework and possibly .NET Standard.

The other questions I found don't take new <TargetFrameworks> way of defining the framework into accounts. Stuff like this doesn't work:

<DefineConstants Condition=" '$(TargetFramework)' == '.NETCoreApp' ">NET_CORE</DefineConstants>
MarcinJuraszek
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  • Do the symbols [here](https://learn.microsoft.com/en-us/dotnet/articles/core/tutorials/libraries) work for you? – DavidG Mar 12 '17 at 22:52
  • Hmm, there is none for .NET Core, but I can handle that by `#if NET40 || NET45 || NET461` and `#else`. Thanks @DavidG! You should post that as an answer so I can accept it. – MarcinJuraszek Mar 12 '17 at 22:56
  • For info, they have added symbols for .Net Core now, see my updated answer :) – DavidG Aug 17 '17 at 21:25
  • Any solution to getting the current version through `$(TargetFramework)` in MSBuild script? – Ted Nyberg Feb 22 '23 at 15:00

2 Answers2

20

There are already various preprocessor symbols defined that you can use. From the docs:

.NET Framework

Framework/Version Symbol
.NET Framework (any version) NETFRAMEWORK
.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 Framework 4.7 NET47
.NET Framework 4.7.1 NET471
.NET Framework 4.7.2 NET472
.NET Framework 4.8 NET48

.NET Standard

Framework/Version Symbol
.NET Standard (any version) NETSTANDARD
.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
.NET Standard 2.0 NETSTANDARD2_0
.NET Standard 2.1 NETSTANDARD2_1

.NET Core

Framework/Version Symbol
.NET [Core] (any version) NETCOREAPP
.NET Core 1.0 NETCOREAPP1_0
.NET Core 1.1 NETCOREAPP1_1
.NET Core 2.0 NETCOREAPP2_0
.NET Core 2.1 NETCOREAPP2_1
.NET Core 2.2 NETCOREAPP2_2
.NET Core 3.0 NETCOREAPP3_0
.NET Core 3.1 NETCOREAPP3_1

.NET 5+

Framework/Version Symbol
.NET 5.0 NET5_0
.NET 6.0 NET6_0
.NET 7.0 NET7_0

Additional <framework>_OR_GREATER Symbols

From the release of .NET6, a suite of <framework>_OR_GREATER symbols were added:

For example:

Target Framework Symbols
.NET Framework NET48_OR_GREATER, NET472_OR_GREATER, NET471_OR_GREATER, NET47_OR_GREATER, NET462_OR_GREATER, NET461_OR_GREATER, NET46_OR_GREATER, NET452_OR_GREATER, NET451_OR_GREATER, NET45_OR_GREATER, NET40_OR_GREATER, NET35_OR_GREATER, NET20_OR_GREATER
.NET Standard NETSTANDARD2_1_OR_GREATER, NETSTANDARD2_0_OR_GREATER, NETSTANDARD1_6_OR_GREATER, NETSTANDARD1_5_OR_GREATER, NETSTANDARD1_4_OR_GREATER, NETSTANDARD1_3_OR_GREATER, NETSTANDARD1_2_OR_GREATER, NETSTANDARD1_1_OR_GREATER, NETSTANDARD1_0_OR_GREATER
.NET 5+ (and .NET Core) NET7_0_OR_GREATER,NET6_0_OR_GREATER, NET5_0_OR_GREATER, NETCOREAPP_OR_GREATER,

NETCOREAPP3_1_OR_GREATER, NETCOREAPP3_0_OR_GREATER, NETCOREAPP2_2_OR_GREATER, NETCOREAPP2_1_OR_GREATER, NETCOREAPP2_0_OR_GREATER, NETCOREAPP1_1_OR_GREATER, NETCOREAPP1_0_OR_GREATER
.NET 5+ (and .NET Core), OS Specific NET6_0_ANDROID_OR_GREATER, NET6_0_IOS_OR_GREATER, NET6_0_MACOS_OR_GREATER, NET6_0_MACCATALYST_OR_GREATER, NET6_0_TVOS_OR_GREATER, NET6_0_WINDOWS_OR_GREATER 
#if NETSTANDARD1_6
    Console.WriteLine("This is .Net Standard 1.6");
#endif

#if NETCOREAPP2_0
    Console.WriteLine("This is .Net Core 2.0");
#endif
DavidG
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    There are also `NETFRAMEWORK`, `NETSTANDARD` and `NETCOREAPP` symbols if you don't care about the exact version. – Jakub Januszkiewicz Sep 11 '19 at 06:01
  • @JakubJanuszkiewicz They were added with .NET Core 3.x I believe, finally got round to adding them (and .NET 5!) in, thanks. – DavidG Nov 18 '20 at 16:26
  • Why might these symbols not be defined in a C# project? `#if DEBUG` and `#if !DEBUG` both work, but none in the list above appear to be defined. Project properies show that `Target framework` is set to `.NET Framework 4.7.2`. – AlainD Dec 08 '20 at 14:50
0

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This is the reference for how to write the code for it.

https://learn.microsoft.com/en-us/dotnet/standard/frameworks

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