ASP.NET Request.Url 屬性完整對照表：從 AbsoluteUri 到 Segments 實測詳解

測試環境與網址

• IIS 網站：主機名 wjnhome.com，連接埠 88
• 虛擬目錄：virtual 指向同一站點
• hosts：127.0.0.1 wjnhome.com
• 測試網址：https://wjnhome.com:88/virtual/urldemo.aspx?id=2#top

核心屬性測試程式碼

// 虛擬目錄路徑
Response.Write("Request.ApplicationPath: " + Request.ApplicationPath);

// 實體檔案完整路徑
Response.Write("Request.PhysicalPath: " + Request.PhysicalPath);
Response.Write("DirectoryName: " + System.IO.Path.GetDirectoryName(Request.PhysicalPath));
Response.Write("Request.PhysicalApplicationPath: " + Request.PhysicalApplicationPath);

// 目前頁面檔名
Response.Write("FileName: " + System.IO.Path.GetFileName(Request.PhysicalPath));

// 虛擬路徑
Response.Write("Request.CurrentExecutionFilePath: " + Request.CurrentExecutionFilePath);
Response.Write("Request.FilePath: " + Request.FilePath);
Response.Write("Request.Path: " + Request.Path);

// 原始 URL 與 Uri 屬性
Response.Write("Request.RawUrl: " + Request.RawUrl);
Response.Write("Request.Url.AbsolutePath: " + Request.Url.AbsolutePath);
Response.Write("Request.Url.AbsoluteUri: " + Request.Url.AbsoluteUri);
Response.Write("Request.Url.Scheme: " + Request.Url.Scheme);
Response.Write("Request.Url.Host: " + Request.Url.Host);
Response.Write("Request.Url.Port: " + Request.Url.Port);
Response.Write("Request.Url.Authority: " + Request.Url.Authority);
Response.Write("Request.Url.LocalPath: " + Request.Url.LocalPath);
Response.Write("Request.PathInfo: " + Request.PathInfo);
Response.Write("Request.Url.PathAndQuery: " + Request.Url.PathAndQuery);
Response.Write("Request.Url.Query: " + Request.Url.Query);
Response.Write("Request.Url.Fragment: " + Request.Url.Fragment);
Response.Write("Request.Url.DnsSafeHost: " + Request.Url.DnsSafeHost);
Response.Write("Request.Url.OriginalString: " + Request.Url.OriginalString);
Response.Write("Request.Url.UserInfo: " + Request.Url.UserInfo);
Response.Write("Request.UrlReferrer: " + Request.UrlReferrer);

// Uri.Segments 逐段拆解
for (int i = 0; i < Request.Url.Segments.Length; i++)
{
    Response.Write("Request.Url.Segment" + i + ": " + Request.Url.Segments[i]);
}

實際輸出結果對照表

常見屬性群組速查

虛擬路徑相關

• ApplicationPath：應用程式根虛擬路徑（含虛擬目錄）
• FilePath / Path / CurrentExecutionFilePath：目前要求檔案虛擬路徑
• Url.AbsolutePath / Url.LocalPath：不含查詢字串的路徑

實體路徑相關

• PhysicalPath：完整實體檔案路徑
• PhysicalApplicationPath：應用程式實體根目錄

完整 URL 相關

• RawUrl：原始 URL（相對路徑 + Query）
• Url.AbsoluteUri：完整絕對 URI
• Url.OriginalString：原始字串表示

查詢字串與片段

• Url.Query：?id=2（含問號）
• Url.PathAndQuery：路徑 + 查詢字串
• Url.Fragment：伺服器端無法取得，瀏覽器不傳送

主機與連接埠

• Url.Host / Url.DnsSafeHost：主機名
• Url.Port：連接埠
• Url.Authority：Host:Port 組合
• Url.Scheme：http/https

實務應用提示

1. 重導向建構：使用 Request.Url.GetLeftPart(UriPartial.Authority) + Request.ApplicationPath 組合基底 URL
2. 取得根網址：Request.Url.Scheme + "://" + Request.Url.Authority + Request.ApplicationPath
3. 判斷虛擬目錄：Request.ApplicationPath != "/"
4. 片段識別符：純前端用途（錨點、SPA 路由），伺服器不可依賴
5. UrlReferrer：可為 null，需檢查再使用，不可作為安全依據