我认为您不需要执行步骤3至5.只需运行该项目，然后在浏览器中打开URL https://localhost:44301 .

I think you don't need to do the steps 3 to 5. Just run the project and open your url https://localhost:44301 in your browser.

现在，由于您的操作，也许您需要删除在ApplicationHost.config文件中创建的虚拟目录

And now, because of your action, maybe you need to remove the virtual directory you created in your ApplicationHost.config file