如何获取ASP.NET应用程序路径？

string appPath = HttpContext.Current.Request.PhysicalApplicationPath;

string appPath = System.Web.Hosting.HostingEnvironment.MapPath("~/");

string appPath = AppDomain.CurrentDomain.BaseDirectory;

string appPath = AppDomain.CurrentDomain.SetupInformation.ApplicationBase;

string appPath = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location);

string appPath = System.Web.HttpRuntime.AppDomainAppPath;