郁闷了一下午的一个问题,帮忙看看
using   System;
using   System.Collections;
using   System.ComponentModel;
using   System.Data;
using   System.Diagnostics;
using   System.Web;
using   System.Web.Services;
using   System.Xml;
using   System.Text;


namespace   AppUpdate
{
public   class   AutoUpdate   :   System.Web.Services.WebService
{
public   AutoUpdate()
{
//CODEGEN:   This   call   is   required   by   the   ASP.NET   Web   Services   Designer
InitializeComponent();
}


private   IContainer   components   =   null;

private   void   InitializeComponent()
{
}

protected   override   void   Dispose(   bool   disposing   )
{
if(disposing   &&   components   !=   null)
{
components.Dispose();
}
base.Dispose(disposing);
}

[WebMethod(Description= "取得最新版本号 ")]
public   string   GetVer()
{
try
{
XmlDocument   doc   =   new   XmlDocument();
doc.Load(Server.MapPath( "update.xml "));
XmlElement   root   =   doc.DocumentElement;

return   root.SelectSingleNode( "version ").InnerText;
}
catch(Exception   e)
{
string   s   =   e.Message;
return   " ";
}

}


}
}

在一winform调用这个webservice,执行到doc.Load(Server.MapPath( "update.xml "));
的时候出错:HttpContext   is   not   available.       This   class   can   only   be   used   in   the   context   of   an   ASP.NET   request.
到底怎么回事啊,没分了,见谅

------解决方案--------------------
Server.MapPath只能用在web程序中。
------解决方案--------------------
Server.MapPath不能用在winform程序里 错误提示已经告诉你了
------解决方案--------------------
把出错提示的E文意思读懂 就知道问题所在了
------解决方案--------------------
HttpContext is not available. This class can only be used in the context of an ASP.NET request.

Server.MapPath只能用在web程序中。