https://docs.microsoft.com/en-us/visualstudio/msbuild/customize-your-build?view=vs-2019
MSBuild projects that use the standard build process (importing Microsoft.Common.props and Microsoft.Common.targets) have several extensibility hooks that you can use to customize your build process.
Add arguments to command-line MSBuild invocations for your project
A Directory.Build.rsp file in or above your source directory will be applied to command-line builds of your project. For details, see MSBuild response files.
Directory.Build.props and Directory.Build.targets
Prior to MSBuild version 15, if you wanted to provide a new, custom property to projects in your solution, you had to manually add a reference to that property to every project file in the solution. Or, you had to define the property in a .props file and then explicitly import the .props file in every project in the solution, among other things.
However, now you can add a new property to every project in one step by defining it in a single file called Directory.Build.props in the root folder that contains your source. When MSBuild runs, Microsoft.Common.props searches your directory structure for the Directory.Build.props file (and Microsoft.Common.targets looks for Directory.Build.targets). If it finds one, it imports the property. Directory.Build.props is a user-defined file that provides customizations to projects under a directory.
Note
Linux-based file systems are case-sensitive. Make sure the casing of the Directory.Build.props filename matches exactly, or it won't be detected during the build process.
See this GitHub issue for more information.
2018-10-19-Roslyn-使用-Directory.Build.props-文件定义编译.md
看起来无法在.net framework项目中使用