.net core 获取起始地址与端口。获取域名，获取端口等

例如请求的地址是: http://localhost:4800/account/login

获取整个url地址：

在页面(cstml)中 
Microsoft.AspNetCore.Http.Extensions.UriHelper.GetDisplayUrl(Context.Request);

在 Controller 中获取

Microsoft.AspNetCore.Http.Extensions.UriHelper.GetDisplayUrl(Request);

获取请求的方式（scheme：http/https）:http

In asp.net 4.6 -> Request.Url.Scheme
in .net core -> Context.Request.Scheme (cshtml) , in Controller -> Request.Scheme

获取域名（不带端口号）[Get the host]:

In asp.net 4.6 -> Request.Url.Host
in .net core -> Context.Request.Host.Host (cshtml) , in Controller -> Request.Host.Host

获取域名（带端口号）[Get the host]: localhost:4800

In asp.net 4.6 ->
in .net core -> Context.Request.Host.Value (cshtml) , in Controller -> Request.Host.Value

获取路径（Get the path）: /account/login

In asp.net 4.6:
In .net core: @Context.Request.Path (cshtml)

获取端口号（Get port）: 4800 (if a url contains port)

In asp.net 4.6: Request.Url.Port
In .net core: @Context.Request.Host.Port (cshtml) , in Controller -> Request.Host.Port