Is it possible to conditionally compile to .NET Framework version?

user_155537 0
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I can recall back when working with MFC you could support multiple versions of the MFC framework by checking the _MFC_VER macro.

I'm doing some stuff now with .NET 4 and would like to use Tuple in a couple of spots but still keep everything else 3.5 compatible.

I'm looking to do something like:

#if DOTNET4
    public Tuple<TSource, TResult> SomeMethod<TSource, TResult>(){...}
#else
    public KeyValuePair<TSource, TResult> SomeMethod<TSource, TResult>(){...}
#endif
.net-4.0 conditional-compilation .net c#
5 Answers

If you are using the .NET Core build system, you can use its predefined symbols:

#if NET40
    public Tuple<TSource, TResult> SomeMethod<TSource, TResult>(){...}
#else
    public KeyValuePair<TSource, TResult> SomeMethod<TSource, TResult>(){...}
#endif

The list of predefined symbols is documented in Developing Libraries with Cross Platform Tools and #if (C# Reference):

.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

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