Conditional per TargetFramework in MsBuild 15

Question

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

net40;net45;n         


        

Answer 1

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

For example:

#if NETSTANDARD1_6
    Console.WriteLine("This is .Net Standard 1.6");
#endif

#if NETCOREAPP2_0
    Console.WriteLine("This is .Net Core 2.0");
#endif