To automatically set new items as startup projects in Visual Studio

There are no new items that are frequently added when you work on a project, so when you need to switch the startup project in Visual Studio, manually right-click in the project and select Set as Startup Project.
In progress. NET basic knowledge management often need to create a new project to explain, each time a new project wrote code and then click to run only found that the previous startup project, but also manually right click on the new project, select "Set as Startup Project", very troublesome. Check the VS option to find a way to set it up:
Select main menu → tools → options → projects and solutions → build and run, select Use currently selected project for new solution as Startup Project

Before that, I thought that there was no such feature in Visual Studio, so I wrote a addins to implement this feature, though it didn't make much sense, but I shared the core code and wanted to help people who needed it:
In the OnConnection of addins:
_applicationobject.events.solutionevents.projectadded + = new _dispsolutionevents_projectaddedeventhandler ( solutionevents_projectadded);

Solutionevents_projectadded Method Implementation:
void solutionevents_projectadded (Project project)
{
Automatically set up a new project when it is added as a startup item
Envdte.solutionclass sol = (envdte.solutionclass) _applicationobject.dte.solution;
Sol. Solutionbuild.startupprojects = new object[] {project.uniquename};
Microsoft.VisualBasic.Information.TypeName (obj);
}

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