如何獲取虛擬目錄對應的物理路徑？

最近在做自動安裝BS系統時，遇到需要獲取虛擬目錄對應的物理路徑的問題，稍微整理一下，分享給大家！

       ///  
        /// 獲取虛擬目錄對應的物理路徑 
        ///  
        /// 所在站點端口端口號 
        /// 虛擬目錄名稱 
        ///  
        public string GetVirtualDirectory(string _portNumber, string _name)
        {
            // 獲取網站的標識符，默認爲1
            string identifier = null;

            DirectoryEntry root = new DirectoryEntry("IIS://LOCALHOST/W3SVC");
            foreach (DirectoryEntry e in root.Children)
            {
                if (e.SchemaClassName == "IIsWebServer")
                {
                    foreach (object property in e.Properties["ServerBindings"])
                    {
                        if (property.Equals(":" + _portNumber + ":"))
                        {
                            identifier = e.Name;
			    break;
                        }
                    }

		    if(identifier != null)
		    {
		        break;
		    }
                }
            }

	    if(identifier != null)
	    {
	        identifier = "1";
	    }

            DirectoryEntry de = new DirectoryEntry("IIS://LOCALHOST/W3SVC/" + identifier + "/ROOT/" + _name);
            string path = (string)de.Properties["Path"].Value;
            return path;
        }