在第4和第5行发生长度不能小于零

问题描述

1 string userIP = Request.UserHostAddress;

2 string serverIP = Request.ServerVariables [LOCAL_ADDR];

3

4 userIP = userIP.Substring（0，userIP.LastIndexOf（。））;

5 serverIP = serverIP.Substring（1，serverIP.LastIndexOf（。））;

1 string userIP = Request.UserHostAddress;
2 string serverIP = Request.ServerVariables["LOCAL_ADDR"];
3
4 userIP = userIP.Substring(0, userIP.LastIndexOf("."));
5 serverIP = serverIP.Substring(1, serverIP.LastIndexOf("."));

// only redirect to WinLogin.aspx if user is internal & IE
 if (userIP.Equals(serverIP) && Request.Browser.IsBrowser("ie"))
  {
     Server.Transfer("SecondLogin.aspx"");
  }
else
  {
     Server.Transfer("ThirdLogin.aspx"");
  }

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