页面加载后的会话值问题 [英] Session Value Problem after Page load

问题描述

亲爱的所有人，



我将一些价值从第一页传递到TheAdmin页面。

我可以在Session中分配值[ user]完美。但是当它重定向到那个页面空值传递时。请帮帮我。下面是我的代码。



1stPage

 UserInfo loggedin =  new  UserInfo（）; 
 loggedin.UserID =  1 ; 
 loggedin.UserName =   Manas; 
 loggedin.SessionID =  111 ; 
 loggedin.ClientName =   Cl1; 
 loggedin.ClientID =  1 ; 
会话[  user] = loggidin; 
 
 Response.Write（ < script>）; 
 Response.Write（  var height = screen.height;）; 
 Response.Write（  var width = screen.width;）; 
 Response.Write（  var params ='left = 0，top = 0，height ='+ height +'，width ='+ width +'，resizable = yes，scrollbars = yes，status = yes';）; 
 
 Response.Write（  var win = window.open（'TheoAdmin.aspx？rand = +  new  System.Random（）。NextDouble（）。ToString（）+  '，' + objclientuser.UserName +   _ Window  +  new  System.Random（）。Next（）。ToString（）+  '，params）;）; 
 Response.Write（  win.focus（）;）; 
 
 Response.Write（  if（navigator.userAgent.indexOf（'MSIE 6.0'） ！=  -  1）{window.opener = window; window.close（）;}）; 
 Response.Write（  else {window.open（''，'_ self'，''）; window.close（）的;}）; 
 Response.Write（ < / script>）; 

管理页面

<！DOCTYPE html> 
 < script     runat   = 服务器 >  
 
  string  clientWidth =  < /跨度>; 
  string  clientHeight =  ; 
  string  browser =  ; 
 
  string  xmlString =   ; 
 
 受保护  void  Page_Load（ object  sender，EventArgs e）
 {
 
 
 UserInfo loggedin =（UserInfo）Session [  user]; 
 
  if （loggedin ==  null ）
 {
 Response.Redirect（  Logout.aspx）; 
} 
  else  
 {
 
 clientWidth =    100％; 
 clientHeight =   100％; 
 
 xmlString + =  < root>; 
 xmlString + =  < username> + loggedin.UserName +  < / username>; 
 xmlString + =  < userid> + loggedin.UserID +  < / userid>; 
 xmlString + =  < hosturl> + ConfigurationManager.AppSettings [  HostURL] +  < / hosturl> 中; 
 xmlString + =  < serviceurl> + ConfigurationManager.AppSettings [  ServiceURL] +  < / serviceURL中> 中; 
 xmlString + =  < random> +  new  System.Random（）。NextDouble（）。ToString（）+  < / random> ;; 
 xmlString + =  < version> + ConfigurationManager.AppSettings [  TAVersion] +  < /版本> 中; 
 xmlString + =  < sessionid> + loggedin.SessionID +  < / sessionid>; 
 xmlString + =  < clientname> + loggedin.ClientName +  < / clientname>; 
 xmlString + =  < subscriptionid> + HttpUtility.UrlEncode（loggedin.SubscriptionID） +  < / subscriptionid>; 
  //   xmlString + =< auth> + Request.Cookies [LOOKINGGLASSFORMSAUTH]。值+< / auth>;  
 xmlString + =  < sess> + Request.Cookies [  ASP.NET_SessionId].Value +  < / sess>; 
 xmlString + =  < currentyear> + System.DateTime.Now.Year。 ToString（）+  < / currentyear>; 
 xmlString + =  < / root>; 
} 
} 
 < /   script  >  
< html> 

解决方案

我发现了一个拼写错误一瞥这里。

 UserInfo loggedin = new UserInfo（）; 
 ................................. 
会话[user] = loggidin; //它应该被登录

我不知道它是否可能是你问题的答案。如果不是问题，请告诉我。



问候......：笑：

你可以创建一个这样的类：

 使用系统; 
 使用 System.Web; 
 
 命名空间 MyWeb 
 {
  public   class  AppSession 
 {
  public   static  UserInfo LoginUser 
 {
  get  
 {
  if （HttpContext.Current.Session [  userinfo] ==  null ）
 {
 HttpContext.Current.Session [  userinfo] =  new  UserInfo（）; 
} 
  return （UserInfo）HttpContext.Current.Session [ 用户信息]; 
} 
 设置 
 {
  //  < span class =code-comment>检测空值 
  //  删除此IF ELSE检查是否要允许分配空值 
  if （ value  ==  null ）
 {
  throw   new 异常（ 分配给Session-LoginUser的值。）; 
} 
 
 HttpContext.Current.Session [  userinfo ] = 值; 
} 
} 
} 
} 

然后您可以在应用程序的任何位置访问它：

  public   partial   class  WebForm1：System.Web.UI.Page 
 {
  protected   void  Page_Load（ object  sender，EventArgs e）
 {
  if （！IsPostBack）
 {
 AppSession.LoginUser =  new  UserInfo（）; 
 AppSession.LoginUser.ClientID =  1 ; 
 AppSession.LoginUser.SessionID =  1 ; 
 AppSession.LoginUser.ClientName =   Cl1; 
 AppSession.LoginUser.UserID =  1 ; 
 AppSession.LoginUser.UserName =   Manas; 
} 
} 
} 

然后在第二页：

 受保护  void  Page_Load（ object  sender，EventArgs e）
 {
  if （AppSession.LoginUser ==  null ）
 {
 Response.Redirect（ 〜/ Logout。 ASPX）; 
} 
} 

现在，继续再试一次。只要为 AppSession.LoginUser 分配了空值，就会抛出异常。从那里你可以追踪你的代码中出现错误的地方。



那么这段代码：

 Response.Write（ < script>）; 
 Response.Write（  var height = screen.height;）; 
 Response.Write（  var width = screen.width;）; 
 Response.Write（  var params ='left = 0，top = 0，height ='+ height +'，width ='+ width +'，resizable = yes，scrollbars = yes，status = yes';）; 

可以写成这个：

 Response.Write（ @  
 
< script type =text / javascript> 
 var height = screen.height; 
 var width = screen.width; 
 var params =' left = 0，top = 0，height ='+ height +'，width ='+ width +'，resizable = yes，scrollbars = yes，status = yes'; 
 
 ）; 

您不必为每一行重复 Response.Write（）。

如果你想逃避双引号符号

你可以逃避它像这样输入两次：

另一个例子使用 @：

此代码：

 xmlString + =  < root>; 
 xmlString + =  < username> + loggedin.UserName +  < / username>; 
 xmlString + =  < userid> + loggedin.UserID +  < / userid>; 
 xmlString + =  < hosturl> + ConfigurationManager.AppSettings [  HostURL] +  < / hosturl> 中; 
 xmlString + =  < serviceurl> + ConfigurationManager.AppSettings [  ServiceURL] +  < / serviceURL中> 中; 
 xmlString + =  < random> +  new  System.Random（）。NextDouble（）。ToString（）+  < / random> ;; 
 xmlString + =  < version> + ConfigurationManager.AppSettings [  TAVersion] +  < /版本> 中; 
 xmlString + =  < sessionid> + loggedin.SessionID +  < / sessionid>; 
 xmlString + =  < clientname> + loggedin.ClientName +  < / clientname>; 
 xmlString + =  < subscriptionid> + HttpUtility.UrlEncode（loggedin.SubscriptionID） +  < / subscriptionid>; 
  //   xmlString + =< auth> + Request.Cookies [LOOKINGGLASSFORMSAUTH]。值+< / auth>;  
 xmlString + =  < sess> + Request.Cookies [  ASP.NET_SessionId].Value +  < / sess>; 
 xmlString + =  < currentyear> + System.DateTime.Now.Year。 ToString（）+  < / currentyear>; 
 xmlString + =  < / root>; 

可以写成：

 xmlString =  @  
< root> 
< username> + loggedin.UserName +  @ < span class =code-string>< / username> 
< userid> + loggedin.UserID +  @ < / userid> 
< hosturl> + ConfigurationManager.AppSettings [  HostURL] +  @ < / hosturl> 
< ; serviceurl> + ConfigurationManager.AppSettings [  ServiceURL] +  @ < / serviceurl> 
< random&g t; +  new  System.Random（）。NextDouble（）。ToString（）+  @ < / random> 
< version> + ConfigurationManager.AppSettings [  TAVersion] +  @ < / version> 
< sessionid> + loggedin.SessionID +  @ < / sessionid> 
< clientname> + loggedin.ClientName +  @ < / clientname> 
< subscriptionid> + HttpUtility.UrlEncode（loggedin.SubscriptionID）+  @ < ; / subscriptionid> 
< sess> + Request.Cookies [  ASP.NET_SessionId]。值+  @ < / sess> 
< currentyear> + System.DateTime.Now.Year.ToString（）+  @ < / currentyear> 
< / root>; 

您不必重复 xmlString + = 在每一行。

会话不需要我不知道这会对你有所帮助

 < span class =code-keyword> string  loggedin = convert.tostring（Session [  user]）; 
 
  if （loggedin ==  ）
 {
 Response.Redirect（  Logout.aspx）; 
} 
  else  
 {
 
 clientWidth =   100％; 
 clientHeight =    100％; 

如果loggdin为null然后你肯定会有另一个问题



reg ARDS ......：）

Dear All,

I am passing some value from 1st Page to TheAdmin Page.
I can assign the value in Session["user"] perfectly .but when it redirects to that page null value passing.Please help me.Below is my code.

1stPage

UserInfo loggedin = new UserInfo();
loggedin.UserID = 1;
loggedin.UserName = "Manas";
loggedin.SessionID = 111;
loggedin.ClientName = "Cl1";
loggedin.ClientID = 1;
Session["user"]=loggidin;
   
Response.Write("<script>");
Response.Write("var height = screen.height;");
Response.Write("var width = screen.width;");
Response.Write("var params='left=0,top=0,height=' + height +',width=' + width + ',resizable=yes,scrollbars=yes,status=yes';");

Response.Write("var win=window.open('TheoAdmin.aspx?rand=" + new System.Random().NextDouble().ToString() + "','" + objclientuser.UserName + "_Window" + new System.Random().Next().ToString() + "',params);");
Response.Write("win.focus();");

Response.Write("if(navigator.userAgent.indexOf('MSIE 6.0') !=-1){window.opener = window;window.close();}");
Response.Write("else{window.open('', '_self', '');window.close();}");
Response.Write("</script>");

The Admin Page

<!DOCTYPE html>
<script runat="server">

    string clientWidth = "";
    string clientHeight = "";
    string browser = "";

    string xmlString = "";

    protected void Page_Load(object sender, EventArgs e)
    {

       
        UserInfo loggedin = (UserInfo)Session["user"];

        if (loggedin == null)
        {
            Response.Redirect("Logout.aspx");
        }
        else
        {
            
            clientWidth = "100%";
            clientHeight = "100%";

            xmlString += "<root>";
            xmlString += "<username>" + loggedin.UserName + "</username>";
            xmlString += "<userid>" + loggedin.UserID + "</userid>";
            xmlString += "<hosturl>" + ConfigurationManager.AppSettings["HostURL"] + "</hosturl>";
            xmlString += "<serviceurl>" + ConfigurationManager.AppSettings["ServiceURL"] + "</serviceurl>";
            xmlString += "<random>" + new System.Random().NextDouble().ToString() + "</random>";
            xmlString += "<version>" + ConfigurationManager.AppSettings["TAVersion"] + "</version>";
            xmlString += "<sessionid>" + loggedin.SessionID + "</sessionid>";
            xmlString += "<clientname>" + loggedin.ClientName + "</clientname>";
            xmlString += "<subscriptionid>" + HttpUtility.UrlEncode(loggedin.SubscriptionID) + "</subscriptionid>";
            //xmlString += "<auth>" + Request.Cookies["LOOKINGGLASSFORMSAUTH"].Value + "</auth>";
            xmlString += "<sess>" + Request.Cookies["ASP.NET_SessionId"].Value + "</sess>";
            xmlString += "<currentyear>" + System.DateTime.Now.Year.ToString() + "</currentyear>";
            xmlString += "</root>";
        }
    }
</script>
<html>

解决方案

I found a typo at first glance here.

UserInfo loggedin = new UserInfo();
.................................
Session["user"]=loggidin;//it should be loggedin 

I dont know whether it may be an answer to your question. Let me know if its not an issue.

Regards..:laugh:

You can create a class like this:

using System;
using System.Web;

namespace MyWeb
{
    public class AppSession
    {
        public static UserInfo LoginUser
        {
            get
            {
                if (HttpContext.Current.Session["userinfo"] == null)
                {
                    HttpContext.Current.Session["userinfo"] = new UserInfo();
                }
                return (UserInfo)HttpContext.Current.Session["userinfo"];
            }
            set
            {
                // Detect null value
                // Delete this IF ELSE checking if you want to allow a null value to be assigned
                if (value == null)
                {
                    throw new Exception("Value assigned to Session-LoginUser detected.");
                }

                HttpContext.Current.Session["userinfo"] = value;
            }
        }
    }
}

Then you can access it any where in your application:

public partial class WebForm1 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            AppSession.LoginUser = new UserInfo();
            AppSession.LoginUser.ClientID = 1;
            AppSession.LoginUser.SessionID = 1;
            AppSession.LoginUser.ClientName = "Cl1";
            AppSession.LoginUser.UserID = 1;
            AppSession.LoginUser.UserName = "Manas";
        }
    }
}

Then at the second page:

protected void Page_Load(object sender, EventArgs e)
{
    if (AppSession.LoginUser == null)
    {
        Response.Redirect("~/Logout.aspx");
    }
}

Now, go ahead and try again. Whenever there is a null value assigned to AppSession.LoginUser, an Exception will be thrown. From there you can trace where is the error occur in your code.

By the way, this block of code:

Response.Write("<script>");
Response.Write("var height = screen.height;");
Response.Write("var width = screen.width;");
Response.Write("var params='left=0,top=0,height=' + height +',width=' + width + ',resizable=yes,scrollbars=yes,status=yes';");

Can be written as this:

Response.Write(@"

<script type=""text/javascript"">
    var height = screen.height;
    var width = screen.width;
    var params='left=0,top=0,height=' + height +',width=' + width + ',resizable=yes,scrollbars=yes,status=yes';"
                
);

You won't have to repeat Response.Write() for each line.
If you want to escape a double quote symbol

"

you can escape it by typing it twice like this:

""

Another example of using @"":
This code:

xmlString += "<root>";
xmlString += "<username>" + loggedin.UserName + "</username>";
xmlString += "<userid>" + loggedin.UserID + "</userid>";
xmlString += "<hosturl>" + ConfigurationManager.AppSettings["HostURL"] + "</hosturl>";
xmlString += "<serviceurl>" + ConfigurationManager.AppSettings["ServiceURL"] + "</serviceurl>";
xmlString += "<random>" + new System.Random().NextDouble().ToString() + "</random>";
xmlString += "<version>" + ConfigurationManager.AppSettings["TAVersion"] + "</version>";
xmlString += "<sessionid>" + loggedin.SessionID + "</sessionid>";
xmlString += "<clientname>" + loggedin.ClientName + "</clientname>";
xmlString += "<subscriptionid>" + HttpUtility.UrlEncode(loggedin.SubscriptionID) + "</subscriptionid>";
//xmlString += "<auth>" + Request.Cookies["LOOKINGGLASSFORMSAUTH"].Value + "</auth>";
xmlString += "<sess>" + Request.Cookies["ASP.NET_SessionId"].Value + "</sess>";
xmlString += "<currentyear>" + System.DateTime.Now.Year.ToString() + "</currentyear>";
xmlString += "</root>";

Can be written as:

xmlString = @"
<root>
    <username>" + loggedin.UserName + @"</username>
    <userid>" + loggedin.UserID + @"</userid>
    <hosturl>" + ConfigurationManager.AppSettings["HostURL"] + @"</hosturl>
    <serviceurl>" + ConfigurationManager.AppSettings["ServiceURL"] + @"</serviceurl>
    <random>" + new System.Random().NextDouble().ToString() + @"</random>
    <version>" + ConfigurationManager.AppSettings["TAVersion"] + @"</version>
    <sessionid>" + loggedin.SessionID + @"</sessionid>
    <clientname>" + loggedin.ClientName + @"</clientname>
    <subscriptionid>" + HttpUtility.UrlEncode(loggedin.SubscriptionID) + @"</subscriptionid>
    <sess>" + Request.Cookies["ASP.NET_SessionId"].Value + @"</sess>
    <currentyear>" + System.DateTime.Now.Year.ToString() + @"</currentyear>
</root>";

You won't have to repeat "xmlString +=" on each line.

session does not required i dont know this will help you or not

string loggedin = convert.tostring( Session["user"]);

if (loggedin == "")
{
Response.Redirect("Logout.aspx");
}
else
{

clientWidth = "100%";
clientHeight = "100%";

if loggdin is null then you definately have another problems

regards......:)

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