如何用于每个循环并显示存储在对象中的项目列表 [英] How to use for each loop and display the List of items in a stored in a object

问题描述

我正在创建在线测验.
我想从数据库中获取问题并将其显示在我的aspx页面中.
我需要使用每个循环来获取每个问题并显示它.
我将每个问题都存储在一个对象中.
如何显示它?
谢谢！

I am creating a online Quiz.
I want to get the Questions from the database and display it in my aspx page.
I need to use for each loop for getting each questions and displaying it.
I stored every question in a object.
How can i display it??
Thanks!

推荐答案

你好

我想你想做的是

你有

1-数据库
2-使用查询或存储过程获取数据的类
3形式显示问题.

使Class中的一个函数具有来自数据库的所有数据
使用类对象获取表单上的所有数据，并将其保存在一个List< class>中.

将数据源添加到要在其上显示数据的控件.


祝你好运..


您所做的操作无法进行迭代，因为foreach循环在可枚举类型上进行迭代.
并且您的对象将不会拥有所有数据.它将仅包含数据库中的最后一项.

因此，要获取所有数据，您将需要在类类型为List的对象中添加对象，然后可以在List上的每个循环中使用该对象.

Hello

i think u want to do is something like

u have

1 - database
2 - Class for fetching data using query or stored procedure
3 - form to display questions .

make One function in Class for having all data from database
get all that data on form using class object and save it in one List<class>

add datasource to the control on which you want to display you data .


good luck ..


what you did cannot iterate because foreach loop iterate on enumerable type .
and your object will not have all data .it will contain only last item from the database .

so for getting all data you will need to add object in a class type List after that you can use for each loop on the List

在为Question创建类时，我们应该将Questions存储在列表.
从问题列表中，我们可以使用foreach循环并逐个显示每个问题.

While creating class for the Question we should store the Questions in a list.
From the list of questions we can use foreach loop and display each question one by one..

{
       dt =HttpContext.Current.Session["Answered"] as DataTable;
       foreach(DataRow row in dt.Rows)
       {
           if(row["Id"].ToString()==Label2.Text)
           {
               row["Selected"]=Convert.ToInt32(RadioButtonList1.SelectedIndex)+1;
               HttpContext.Current.Session["Result"] = dt;
           }
       }
       dt = HttpContext.Current.Session["Result"] as DataTable;
       foreach (DataRow row in dt.Rows)
       {
           if (row["Selected"].ToString() == row["CorrectOption"].ToString())
           {
               marks = marks + 1;
           }
       }
       HttpContext.Current.Session["Marks"] = marks;
   }

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