参考资料：https://sites.google.com/site/netcorenote/asp-net-core/get-scheme-url-host

Example there's an given url: 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

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