public IActionResult Post(HelloModel model)
 {
     HelloModel.MyAnswer = $"{model.YourName} 你好,這裡是 ASP.NET Core Page";
     return(View(HelloModel));
 }
 public HelloController()
 {
     HelloModel          = new HelloModel();
     HelloModel.YourName = "請在此輸入姓名";
 }