----------
20190624

ref:
https://blog.miniasp.com/post/2008/02/10/How-Do-I-Get-Paths-and-URL-fragments-from-the-HttpRequest-object.aspx
https://adon988.logdown.com/posts/7624741-aspnet-c-url-parameter-parsing-get-url-parameters


網址例：
http://localhost:1897/News/Press/Content.aspx/123?id=1#toc
https://my.url.com:8080/Detail/Page/List.aspx/showmore?mid=20#main

/*
----------------------------------------------------- ----------------------------------------------------
Request.ApplicationPath                               /
                                                      /
Request.CurrentExecutionFilePath                      /News/Press/Content.aspx
                                                      /Detail/Page/List.aspx
Request.FilePath                                      /News/Press/Content.aspx
                                                      /Detail/Page/List.aspx
----------------------------------------------------- ----------------------------------------------------
Request.Path                                          /News/Press/Content.aspx/123
                                                      /Detail/Page/List.aspx/showmore
Request.PathInfo                                      /123
                                                      /showmore
Request.PhysicalApplicationPath                       D:\Projects\Solution\web\
                                                      C:\wwwroot\
Request.PhysicalPath                                  D:\Projects\Solution\web\News\Press\Content.aspx 
                                                      C:\wwwroot\Detail\Page\List.aspx    
Request.RawUrl                                        /News/Press/Content.aspx/123?id=1
                                                      /Detail/Page/List.aspx/showmore?mid=20
----------------------------------------------------- ----------------------------------------------------
Request.Url.AbsolutePath                              /News/Press/Content.aspx/123
                                                      /Detail/Page/List.aspx/showmore
Request.Url.AbsoluteUri                               http://localhost:1897/News/Press/Content.aspx/123?id=1
                                                      https://my.url.com:8080/Detail/Page/List.aspx/showmore?mid=20
Request.Url.Authority                                 localhost:1897
                                                      my.url.com:8080
----------------------------------------------------- ----------------------------------------------------
Request.Url.Fragment
                     
Request.Url.Scheme                                    http
                                                      https
Request.Url.Host                                      localhost
                                                      my.url.com 
Request.Url.Port                                      1897
                                                      8080
Request.Url.LocalPath                                 /News/Press/Content.aspx/123
                                                      /Detail/Page/List.aspx/showmore
----------------------------------------------------- ----------------------------------------------------
Request.Url.PathAndQuery                              /News/Press/Content.aspx/123?id=1
                                                      /Detail/Page/List.aspx/showmore?mid=20
Request.Url.Query                                     ?id=1
                                                      ?mid=20
Request.Url.Segments                                  /, News/, Press/, Content.aspx/, 123
                                                      /, Detail/, Page/, List.aspx/, showmore
----------------------------------------------------- ----------------------------------------------------
*/


所以當你看了這張表之後，你還會想用 Request.Url.PathAndQuery.Substring(1, Request.Url.PathAndQuery.IndexOf("/", 1)-1) 這種寫法嗎？
用這樣寫 Request.Url.Segments[1].Replace("/", "") 不是又短又直覺嗎？ ^_^

以下是產生以上表格的程式碼：
protected void Page_Load(object sender, EventArgs e)
{ 

    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:1897/News/Press/Content.aspx/123?id=1#toc");
    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>"); 

    ltlTable.Text = sb.ToString();
}
注意事項
當程式部署(Deploy)到 IIS 6 之後，假設你的網址是 http://localhost:1897/News/Press/Content.aspx/123? ，IIS 不知為何會將問號 ( ? ) 給刪除掉，以致於 ASP.NET 使用 Request.Url.Query 是空字串！如果你的程式有判斷到這部分時就要特別注意，因為照理說應該會抓到才對！不知道是不是 IIS 6 的 Bug ？