I just installed visual studio and ran into some errors specifically The WindowsSDKDir property is not defined. Some build tools may not be found

I ran into the same issue today. It turns out I didn't check the Win10SDK to save disk space while installation.

Solution:

In VS, go Tools menu=>Get Tools and Features=>install the Windows 10 SDK(10.XX.XX.XX)

Once installed, launch VS and open your project, right-click your project(NOT Solution)->properties->General->Windows SDK Version, check the value should be 10.0 instead of blank. Then the compiling just worked.

I've got the same issue and turned out that I haven't installed Windows SDK. It can be done by typing "Install Windows SDK" into visual studio's search prompt

I had same problem when I installed Visual Studio 2019 on Windows7 and opened project created in Visual Studio 2017 (witch wasn't installed on that machine). To solve the problem I went to project Properties -> General -> Windows SDK Version And changed it from 10 to 8.1.