如何獲得相對uri的絕對uri？

Question

我有一個相對路徑爲「〜/ pages/mypage.aspx」的頁面。

我試過使用VirtualPathUtility.ToAbsolute（@「〜/ pages/mypage.aspx」）希望得到絕對的uri，但它只返回相同的相對路徑。

我怎麼能從這個相對的uri中獲得絕對的uri？

感謝，

Answer 1

摘自我用這個方法：

private static string GetAbsoluteUrl(string relativeUrl) 
    { 
     var applicationUrl = String.Empty; 

     // remove ~ 
     if (relativeUrl.StartsWith("~")) 
     { 
      applicationUrl = relativeUrl.Substring(1); 
     } 

     applicationUrl = (HttpContext.Current.Request.ApplicationPath + applicationUrl) 
      .Replace("//", "/"); 

     var baseUrl = String.Format("{0}://{1}:{2}", 
            HttpContext.Current.Request.Url.Scheme, 
            HttpContext.Current.Request.Url.Host, 
            HttpContext.Current.Request.Url.Port); 

     return baseUrl + applicationUrl; 
    } 

Answer 2

public static string ResolveUrl(string originalUrl) 
    { 
     if (originalUrl == null) 
      return null; 

     // *** Absolute path - just return 
     if (originalUrl.IndexOf("://") != -1) 
      return originalUrl; 

     // *** Fix up image path for ~ root app dir directory 
     if (originalUrl.StartsWith("~")) 
     { 
      string newUrl = ""; 
      if (HttpContext.Current != null) 
       newUrl = HttpContext.Current.Request.ApplicationPath + 
         originalUrl.Substring(1).Replace("//", "/"); 
      else 
       // *** Not context: assume current directory is the base directory 
       throw new ArgumentException("Invalid URL: Relative URL not allowed."); 

      // *** Just to be sure fix up any double slashes 
      return newUrl; 
     } 

     return originalUrl; 
    } 

從http://www.west-wind.com/weblog/posts/154812.aspx