Asp.Net Core Web相对路径、绝对路径整理

一、相对路径

1.关于Asp.Net Core中的相对路径主要包括两个部分：一、Web根目录，即当前网站的目录为基础；二、内容目录wwwroot文件夹，对于静态文件都放在这个目录。

2.获取控制器，Action的路径

对于控制器、视图的链接生成，主要通过视图上下文、控制器上下文的Url对象

Url对象实现了IUrlHelper接口，主要功能是获取网站的相对目录，也可以将‘~’发号开头的转换成相对目录。

    //
    // 摘要:
    //     Defines the contract for the helper to build URLs for ASP.NET MVC within an application.
    public interface IUrlHelper
    {
        //
        // 摘要:
        //     Gets the Microsoft.AspNetCore.Mvc.IUrlHelper.ActionContext for the current request.
        ActionContext ActionContext { get; }

        //
        // 摘要:
        //     Generates a URL with an absolute path for an action method, which contains the
        //     action name, controller name, route values, protocol to use, host name, and fragment
        //     specified by Microsoft.AspNetCore.Mvc.Routing.UrlActionContext. Generates an
        //     absolute URL if Microsoft.AspNetCore.Mvc.Routing.UrlActionContext.Protocol and
        //     Microsoft.AspNetCore.Mvc.Routing.UrlActionContext.Host are non-null.
        //
        // 参数:
        //   actionContext:
        //     The context object for the generated URLs for an action method.
        //
        // 返回结果:
        //     The generated URL.
        string Action(UrlActionContext actionContext);
        //
        // 摘要:
        //     Converts a virtual (relative) path to an application absolute path.
        //
        // 参数:
        //   contentPath:
        //     The virtual path of the content.
        //
        // 返回结果:
        //     The application absolute path.
        //
        // 备注:
        //     If the specified content path does not start with the tilde (~) character, this
        //     method returns contentPath unchanged.
        string Content(string contentPath);
        //
        // 摘要:
        //     Returns a value that indicates whether the URL is local. A URL is considered
        //     local if it does not have a host / authority part and it has an absolute path.
        //     URLs using virtual paths ('~/') are also local.
        //
        // 参数:
        //   url:
        //     The URL.
        //
        // 返回结果:
        //     true if the URL is local; otherwise, false.
        bool IsLocalUrl(string url);
        //
        // 摘要:
        //     Generates an absolute URL for the specified routeName and route values, which
        //     contains the protocol (such as "http" or "https") and host name from the current
        //     request.
        //
        // 参数:
        //   routeName:
        //     The name of the route that is used to generate URL.
        //
        //   values:
        //     An object that contains route values.
        //
        // 返回结果:
        //     The generated absolute URL.
        string Link(string routeName, object values);
        //
        // 摘要:
        //     Generates a URL with an absolute path, which contains the route name, route values,
        //     protocol to use, host name, and fragment specified by Microsoft.AspNetCore.Mvc.Routing.UrlRouteContext.
        //     Generates an absolute URL if Microsoft.AspNetCore.Mvc.Routing.UrlActionContext.Protocol
        //     and Microsoft.AspNetCore.Mvc.Routing.UrlActionContext.Host are non-null.
        //
        // 参数:
        //   routeContext:
        //     The context object for the generated URLs for a route.
        //
        // 返回结果:
        //     The generated URL.
        string RouteUrl(UrlRouteContext routeContext);
    }

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