大家好，今天一起學習如何寫一個 開發網址的解析器。

Step 1. 建立輸入的頁面
Controller

 public ActionResult Index()
    {
   

        return View();
    }

View

@{
    ViewBag.Title = "Index";
}

<h2>輸入ID
    </h2>

@using (Html.BeginForm("Web", "Count", FormMethod.Post))
{

    <input type="text" name="id" />

    <input type="submit"  value="送出" />
}

Step 2. 建立顯示的頁面

Controler

 public ActionResult Web(int id) {
        StringBuilder sb = new StringBuilder();

        sb.Append("<table cellpadding=3 cellspacing=0 border=1>");

        sb.Append("<tr><td colspan=2>");
        sb.Append("網址：http://localhost:3711/Count/Web/?id=" + id);
        sb.Append("</td></tr>");

        // Request.ApplicationPath
        sb.Append("<tr><td>");
        sb.Append("Request.ApplicationPath");
        sb.Append("</td><td>");
        sb.Append("<b>" + Request.ApplicationPath + "</b>");
        sb.Append("</td></tr>");

        // Request.PhysicalPath
        sb.Append("<tr><td>");
        sb.Append("Request.PhysicalPath");
        sb.Append("</td><td>");
        sb.Append("<b>" + Request.PhysicalPath + "</b>");
        sb.Append("</td></tr>");

        // System.IO.Path.GetDirectoryName(Request.PhysicalPath)
        sb.Append("<tr><td>");
        sb.Append("System.IO.Path.GetDirectoryName(Request.PhysicalPath)");
        sb.Append("</td><td>");
        sb.Append("<b>" + System.IO.Path.GetDirectoryName(Request.PhysicalPath) + "</b>");
        sb.Append("</td></tr>");

        // Request.PhysicalApplicationPath
        sb.Append("<tr><td>");
        sb.Append("Request.PhysicalApplicationPath");
        sb.Append("</td><td>");
        sb.Append("<b>" + Request.PhysicalApplicationPath + "</b>");
        sb.Append("</td></tr>");

        // System.IO.Path.GetFileName(Request.PhysicalPath)
        sb.Append("<tr><td>");
        sb.Append("System.IO.Path.GetFileName(Request.PhysicalPath)");
        sb.Append("</td><td>");
        sb.Append("<b>" + System.IO.Path.GetFileName(Request.PhysicalPath) + "</b>");
        sb.Append("</td></tr>");

        // Request.CurrentExecutionFilePath
        sb.Append("<tr><td>");
        sb.Append("Request.CurrentExecutionFilePath");
        sb.Append("</td><td>");
        sb.Append("<b>" + Request.CurrentExecutionFilePath + "</b>");
        sb.Append("</td></tr>");

        // Request.FilePath
        sb.Append("<tr><td>");
        sb.Append("Request.FilePath");
        sb.Append("</td><td>");
        sb.Append("<b>" + Request.FilePath + "</b>");
        sb.Append("</td></tr>");

        // Request.Path
        sb.Append("<tr><td>");
        sb.Append("Request.Path");
        sb.Append("</td><td>");
        sb.Append("<b>" + Request.Path + "</b>");
        sb.Append("</td></tr>");

        // Request.RawUrl
        sb.Append("<tr><td>");
        sb.Append("Request.RawUrl");
        sb.Append("</td><td>");
        sb.Append("<b>" + Request.RawUrl + "</b>");
        sb.Append("</td></tr>");

        // Request.Url.AbsolutePath
        sb.Append("<tr><td>");
        sb.Append("Request.Url.AbsolutePath");
        sb.Append("</td><td>");
        sb.Append("<b>" + Request.Url.AbsolutePath + "</b>");
        sb.Append("</td></tr>");

        // Request.Url.AbsoluteUri
        sb.Append("<tr><td>");
        sb.Append("Request.Url.AbsoluteUri");
        sb.Append("</td><td>");
        sb.Append("<b>" + Request.Url.AbsoluteUri + "</b>");
        sb.Append("</td></tr>");

        // Request.Url.Scheme
        sb.Append("<tr><td>");
        sb.Append("Request.Url.Scheme");
        sb.Append("</td><td>");
        sb.Append("<b>" + Request.Url.Scheme + "</b>");
        sb.Append("</td></tr>");

        // Request.Url.Host
        sb.Append("<tr><td>");
        sb.Append("Request.Url.Host");
        sb.Append("</td><td>");
        sb.Append("<b>" + Request.Url.Host + "</b>");
        sb.Append("</td></tr>");

        // Request.Url.Port
        sb.Append("<tr><td>");
        sb.Append("Request.Url.Port");
        sb.Append("</td><td>");
        sb.Append("<b>" + Request.Url.Port + "</b>");
        sb.Append("</td></tr>");

        // Request.Url.Authority
        sb.Append("<tr><td>");
        sb.Append("Request.Url.Authority");
        sb.Append("</td><td>");
        sb.Append("<b>" + Request.Url.Authority + "</b>");
        sb.Append("</td></tr>");

        // local Request.Url.LocalPath
        sb.Append("<tr><td>");
        sb.Append("Request.Url.LocalPath");
        sb.Append("</td><td>");
        sb.Append("<b>" + Request.Url.LocalPath + "</b>");
        sb.Append("</td></tr>");

        // Request.PathInfo
        sb.Append("<tr><td>");
        sb.Append("Request.PathInfo");
        sb.Append("</td><td>");
        sb.Append("<b>" + Request.PathInfo + "</b>");
        sb.Append("</td></tr>");

        // Request.Url.PathAndQuery
        sb.Append("<tr><td>");
        sb.Append("Request.Url.PathAndQuery");
        sb.Append("</td><td>");
        sb.Append("<b>" + Request.Url.PathAndQuery + "</b>");
        sb.Append("</td></tr>");

        // Request.Url.Query
        sb.Append("<tr><td>");
        sb.Append("Request.Url.Query");
        sb.Append("</td><td>");
        sb.Append("<b>" + Request.Url.Query + "</b>");
        sb.Append("</td></tr>");

        // Request.Url.Fragment
        // 原則上你應該無法從 Request.Url.Fragment 取得任何資料，因為通常 Browser 不會送出 #toc 這個部分
        sb.Append("<tr><td>");
        sb.Append("Request.Url.Fragment");
        sb.Append("</td><td>");
        sb.Append("<b>" + Request.Url.Fragment + "</b>");
        sb.Append("</td></tr>");

        // Request.Url.Segments
        sb.Append("<tr>");
        sb.Append("<td>");
        sb.Append("Request.Url.Segments");
        sb.Append("</td>");
        sb.Append("<td>");
        string[] segments = Request.Url.Segments;
        foreach (string s in segments)
        {
            sb.Append("<b>" + s + "</b>");
            sb.Append("<br/>");
        }
        sb.Append("</td>");
        sb.Append("</tr>");

        sb.Append("</table>");

        ViewBag.SB = sb.ToString();

        return View();

    }
    
    

View

    @{
    ViewBag.Title = "Web";
    }

    <h2>Web</h2>

    @Html.Raw(@ViewBag.SB)
    
    

參考網址：
https://blog.miniasp.com/post/2008/02/10/How-Do-I-Get-Paths-and-URL-fragments-from-the-HttpRequest-object.aspx