First, the use vs2017 generate dll file
New Project -> Library -> Build Solution, write a simple implementation addition dll file
Second, the new project calls dll file
New Project -> Application Forms
The MyTestDll.dll MyTestDll projects debug folder copied to the debug folder of the project, add a reference -> View -> MyTestDll.dll
On the plus namespace using MyTestDll
Button realization:
Note: The first instance of the class, and then call the methods in the class.
Last Function:
