从aspx页面的会话中获取数据？
[英]get data from session in an aspx page?
问题描述
I have class Bean, then I creat some ob off Bean and add them to a list, then I convert list to an array. 
我有Bean类，然后在Bean上创建了一些对象并将其添加到列表中，然后将列表转换为数组。 I add this array into a session and use it in a aspx page, but cannot get data from session. 我将此数组添加到会话中并在aspx页中使用它，但是无法从会话中获取数据。
public Bean[] listAnswer()
{
SqlConnection con = new SqlConnection(@"Data Source=LEHUULOC-PC;Initial Catalog=WebThiTracNghiem;Integrated Security=True");
con.Open();
string sql = "SELECT * FROM tblCauhoi";
SqlCommand com = new SqlCommand(sql, con);
com.CommandType = CommandType.Text;
SqlDataReader dr = com.ExecuteReader();
List<Bean> Listbean = new List<Bean>();
Bean[] result = null;
while (dr.Read())
{
string macauhoi = (string)dr[0];
string cauhoi = (string)dr[1];
string cautraloi = (string)dr[2];
string traloidung = (string)dr[3];
//string dokho = (string)dr[4];
Bean answer = new Bean(macauhoi, cauhoi, cautraloi, traloidung, "");
Listbean.Add(answer);
result = new Bean[Listbean.Count];
result = Listbean.ToArray();
}
dr.Close();
con.Close();
return result;
}
====================================== =====================================
Bean bean = new Bean();
Bean[] answer = bean.listAnswer();
Session.Add("ANSWER",(Bean[])answer);
====================================== =====================================
<body>
<form id="form1" runat="server">
<div>
this is hocsinh page
<asp:Label ID="lblWelcome" runat="server"></asp:Label>
<%
foreach (var Bean in Session["ANSWER"])
{
}
%>
</div>
</form>
but I receive error: foreach statement cannot operate on variables of type 'object' because 'object' does not contain a public definition for 'GetEnumerator' 但我收到错误消息：foreach语句无法对类型为“对象”的变量进行操作，因为“对象”不包含“ GetEnumerator”的公共定义
2 个解决方案
解决方案1
0 2015-03-24 10:25:10
Try this: 尝试这个：
<%
Bean[] list = (Bean[])Session["RESULT"];
if (list != null)
foreach (var Bean in list)
{
}
%>
解决方案2
0 2015-03-24 10:27:33
Bean has to be serializable and put it like this into your session: Bean必须是可序列化的，并将其像这样放入您的会话中：
Session.Add("ANSWER",bean);
read it like this: 像这样阅读：
var beans = Session["Answer"] as Bean[];
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