对象引用未设置为对象的实例“当将值从子页面初始化到会话页面到主页面功能时 [英] Object reference not set to an instance of an object "when initializing value into session from child page to master page function

问题描述

母版页

master page

OrdrInfo ordinfo = (OrdrInfo)Session["addtocartlist"]; // OrdrInfo is class where i have arraylist.
shopCarInfor(ordinfo);

public void shopCarInfor(OrdrInfo order)
{

Session["addtocartlist"] = order;
}


//till now there is no problem. .

///child page:

protected void c1_row_command(object sender, C1GridViewCommandEventArgs e) // when this function calls using command name 
{
if (e.CommandName.ToLower() == "delete")
{
// i am deleting particulars and binding into class
OrdrInfo model = (OrdrInfo)Session["addtocartlist"];

}
//there is some needed that i need to update class value from child page to master pager 
//so, i called like below,
project.MasterPage.Site1 objsite = new MasterPage.Site1();

objsite.shopCarInfor(model);

}

//this objsite.shopCarInfor(model); calls correctly which is in master page also i am getting //value here

public void shopCarInfor(OrdrInfo order) // i am getting value in order
{

Session["addtocartlist"] = order; // when initializing order to session , i am getting error like "Object reference not set to an instance of an object".

}

如何解决这个问题？需要帮助。

how to solve this problem? help needed.

推荐答案

我不知道你为什么要创建新的实例你掌握页面。



你可以打电话给它打电话

Hi,

I don't know why you are creating new instance of you master page.

you can call it call the same as

Master.[Your function]

你必须指定母版页

you must specify the master page

<%@ MasterType virtualpath="~/Masters/Master1.master" %>

有关母版页的更多信息： http://msdn.microsoft .com / zh-cn / library / vstudio / xxwa0ff0（v = vs.100）.aspx [ ^ ]



我没有看到任何错误代码，但你发布主页和内容页面然后我更清楚地理解。

For more information on Master Page : http://msdn.microsoft.com/en-us/library/vstudio/xxwa0ff0(v=vs.100).aspx[^]

I did not saw any erroneous code but you post the both master and content page then I more clear to understand.

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