是否有任何正式的目标框架指令?

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我已阅读

I've read Microsoft's article about how to detect target framework, for example :

netcoreapp2.2 net47 net58

But there are situations where I don't care about the exact version, but the general framework target :

NETCORE .Net Framework

But I didn't find such flags.

Question:

Are there any generalized flags for that ? or better, how can I distinguish between those two without specifying all options?

解决方案

Besides the version-specific directives such as NETSTANDARD2_0, the Target frameworks documentation lists the following preprocessor symbols:

• NETFRAMEWORK

• NETSTANDARD

• NETCOREAPP

...and NETMF for .NET Micro Framework, WP for Windows Phone, and UAP for Universal Windows Platform.

Here is an example .csproj:

<Project Sdk="Microsoft.NET.Sdk"> <PropertyGroup> <TargetFrameworks>netstandard1.5;netstandard2.0;net48;netcoreapp3.0</TargetFrameworks> </PropertyGroup> </Project>

and C# class:

namespace ClassLibrary1 { public class Class1 { public void Test() { #if NETFRAMEWORK System.Console.WriteLine(".NET Framework"); #elif NETCOREAPP System.Console.WriteLine(".NET Core"); #elif NETSTANDARD System.Console.WriteLine(".NET Standard"); #endif } } }

Here's .NET Core 3.0 selected (see top left), with the NETCOREAPP region 'live' and the others greyed out: