VS2022 - Can we Add Items directly to the Solution from a Project Template Wizard?

Question

Working on a project template that includes a few files that need to be at the root level of the solution folder. This part isn't so difficult as i can move the files manually after generation, and update the Project.ProjectItems from within the wizard.
However, i would still like the files to be visible within the IDE so that the developer can easily find and modify them after generation. Now, I can "right click" on the solution in the IDE and manually add the three files, however, it would be nice if i could modify the solution file directly.
However, I have tried directly modifying the sln file in both the IWizard.ProjectFinishedGenerating and IWizard.RunFinished events. Additionally, i have tried using the the Project.DTE.Solution property to "add" these "Solution Items" to the solution, but none appear to be effective.
Is there a way I can have a project template evaluate the solution in order to add specific file items to the solution for the new project. Thanks Jaeden "Sifo Dyas" al'Raec Ruiner

Answer 1

I found that by using this method, i was able to mostly achieve my goal:

//Assuming in the RunWizard method of IWizard, the provided applicationObject parameter has
//been cast into a class field _dte of the type EnvDTE80.DTE2
Solution2 sln = (Solution2)this._dte.Solution;
if (sln != null) 
{
	Project folder = sln.AddSolutionFolder("Solution Items");
	foreach(string name in [FileNamesToAdd])
	{
		folder.ProjectItems.AddFromFile(Path.Combine([SolutionFolderFromReplacements], name);
	}
	foreach (Document doc in this.Application.Documents)
	{
		if ([FileNamesToAdd].Contains(doc.Name))
			doc.Close();
	}
}

//This solution does not close any external editors for files added to solution