ASP.NET中的Path

Request获取的信息
Request.AppRelativeCurrentExecutionFilePath                  ~/SysOption/BillingSetup1.aspx
Request.ApplicationPath                                                 /
Request.CurrentExecutionFilePath                                   /SysOption/BillingSetup1.aspx
Request.FilePath                                                            /SysOption/BillingSetup1.aspx
Request.Path                                                                /SysOption/BillingSetup1.aspx
Request.PathInfo                                                          什么都没有（待测其他用法）
Request.PhysicalApplicationPath                               D:\VssWorkFolder\British_School_MIS\src\WebSite\
Request.PhysicalPath                                                      D:\VssWorkFolder\British_School_MIS\src\WebSite\SysOption\BillingSetup1.aspx
Request.UserHostAddress                                              192.168.1.6
Request.UserHostName                                                  192.168.1.6
Request.Url.ToString()                                                    http://192.168.1.6/SysOption/BillingSetup1.aspx?x=d
Request.UrlReferrer                                                        空引用或者跳转源页面地址        

Request.ServerVariables集合中获取到的相关信息:
左列是服务器变量名，右侧是值，值是通过Request.ServerVariables[服务器变量名]获取的
APPL_MD_PATH : /LM/W3SVC/894523/Root
APPL_PHYSICAL_PATH : D:\VssWorkFolder\British_School_MIS\src\WebSite\
INSTANCE_META_PATH : /LM/W3SVC/894523
LOCAL_ADDR : 192.168.1.6
PATH_INFO : /SysOption/BillingSetup1.aspx
PATH_TRANSLATED : D:\VssWorkFolder\British_School_MIS\src\WebSite\SysOption\BillingSetup1.aspx
REMOTE_ADDR : 192.168.1.6
REMOTE_HOST : 192.168.1.6
SCRIPT_NAME : /SysOption/BillingSetup1.aspx
SERVER_NAME : 192.168.1.6
URL : /SysOption/BillingSetup1.aspx

Request.ServerVariables是一个很强大的工具，可以帮助我们获取很多client和web宿主的信息，有兴趣的朋友可以通过以下代码看看它到底包含什么信息

         foreach  ( string  s  in  Request.ServerVariables)
        {
            Response.Write(s  +   "   :   "   +  Request.ServerVariables[s]  +   " " );
        }

path转换
1.转换为服务器端路径（Server.MapPath）
web服务器端开发设计一个有趣的问题就是，地址转换。比如http地址/images/a.txt，如果你想在服务器端通过io读取这个文件，就得有这个文件的“本机地址（形如c:\windows\system32\xx.dll）”,这时Server.MapPath就很有用了
Response.Write(Request.MapPath(Request.Path));        输出为 D:\VssWorkFolder\British_School_MIS\src\WebSite\SysOption\BillingSetup1.aspx
2.转换为http地址（Page.ResolveClientUrl Page.ResolveUrl）
Response.Write(Page.ResolveClientUrl("~/a/a.jpg"));      输出为 ../a/a.jpg
Response.Write(Page.ResolveUrl("~/a/a.jpg"));              输出为 /a/a.jpg