Asp.net中获取应用程序完整Url路径的方法

/// <summary>
/// Gets the absolute root
/// </summary>
public static Uri AbsoluteWebRoot
{
get
{
var context = HttpContext.Current;
UriBuilder uri = new UriBuilder();
uri.Host = context.Request.Url.Host;
if (!context.Request.Url.IsDefaultPort)
{
uri.Port = context.Request.Url.Port;
}

uri.Path = VirtualPathUtility.ToAbsolute("~/");

Uri absoluteWebRoot = uri.Uri;

return absoluteWebRoot;
}
}