[英]Conditional reference in Visual Studio Community 2017
I am creating a multi-platform application. 我正在创建一个多平台应用程序。 I have a multi-targeted shared library (targeting .netstandard 2.0 and .net 4.5)...See project file:
我有一个多目标共享库(目标是.netstandard 2.0和.net 4.5)...请参阅项目文件:
<PropertyGroup>
<TargetFrameworks>netstandard2.0;net45</TargetFrameworks>
</PropertyGroup>
When I build the project in visual studio 2017 on windows, I get two directories in the output (netstandard2.0, net45) and the corresponding dlls. 当我在Windows上的Visual Studio 2017中构建项目时,我在输出中得到两个目录(netstandard2.0,net45)和相应的dll。 The build is a success.
构建成功。
When I build the exact same project (same code) in visual studio 2017 on a mac, I get errors of this nature: 当我在Mac上的Visual Studio 2017中构建完全相同的项目(相同的代码)时,出现这种错误:
The type 'OptionAttribute' exists in both 'CommandLine.DotNetStandard, Version=1.0.30' and 'CommandLine, Version=1.9.71.2'
类型'OptionAttribute'在'CommandLine.DotNetStandard,Version = 1.0.30'和'CommandLine,Version = 1.9.71.2'中都存在
I conditionally referenced a command line parser library in the following way: 我通过以下方式有条件地引用了命令行解析器库:
<!-- CommandLineParser library -->
<ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
<PackageReference Include="CommandLine.DotNetStandard">
<Version>1.0.3</Version>
</PackageReference>
</ItemGroup>
<ItemGroup Condition="'$(TargetFramework)' == 'net45'">
<PackageReference Include="CommandLineParser">
<Version>1.9.71</Version>
</PackageReference>
</ItemGroup>
This works great for windows, but on the mac it appears it is not observing the condition. 这对于Windows非常有用,但是在Mac上似乎没有观察到这种情况。 Is this a known bug for visual studio on mac?
这是Mac上Visual Studio的已知错误吗? Am I doing something wrong?
难道我做错了什么?
Visual Studio ignores the condition in these cases. 在这些情况下,Visual Studio会忽略该条件。 Use a
Choose/When
instead, that should be fully supported: https://msdn.microsoft.com/en-us/library/ms164282.aspx 使用
Choose/When
代替,应该完全支持: https : //msdn.microsoft.com/zh-cn/library/ms164282.aspx
<Choose>
<When Condition=" '$(TargetFramework)' == 'netstandard2.0' ">
<ItemGroup>
<PackageReference Include="CommandLine.DotNetStandard">
<Version>1.0.3</Version>
</PackageReference>
</ItemGroup>
</When>
<When Condition=" '$(TargetFramework)' == 'net45' ">
<ItemGroup>
<PackageReference Include="CommandLineParser">
<Version>1.9.71</Version>
</PackageReference>
</ItemGroup>
</When>
</Choose>
If MsBuild is taking into account only your first <Choose/>
or condition then you'd want to do this: 如果MsBuild仅考虑您的第一个
<Choose/>
或条件,则您需要这样做:
<Choose>
<When Condition="'$(Configuration)'=='Debug'">
<ItemGroup>
<ProjectReference Include="..\path\to_your_project.csproj" />
</ItemGroup>
</When>
<Otherwise>
<ItemGroup>
<PackageReference Include="Package-Name" Version="1.0.0"/>
</ItemGroup>
</Otherwise>
</Choose>
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