会话不记得设置值
我正在尝试使用 ASP.NET 中的会话状态在两个页面之间传递数据。需要传递的数据来自 GridView 的单元格。因此，在 SelectedIndexChanged 事件中，我将这样存储数据：
protected void GridViewEmployees_SelectedIndexChanged(object sender, EventArgs e)
{
Session["Name"] =
this.GridViewEmployees.Rows[GridViewEmployees.SelectedIndex].DataItem;
}
然后，我想在另一个页面中使用会话的内容。代码：
protected void Page_Load(object sender, EventArgs e)
{
string name = (string)(Session["Name"]);
string[] names = name.Split(' ');
this.EntityDataSourceNorthwind.Where =
"it.[FirstName] = \'" + names[0] +
"\' AND it.[lastName] = \'" + names[1] + "\'";
}
但我得到一个空引用异常。另外，我已经在 Page_Load 事件上设置了会话初始化，并且会话被存储在那里，一切正常。我的意思是：
protected void Page_Load(object sender, EventArgs e)
{
if (Session["Name"] == null)
{
Session["Name"] = "Andrew Fuller";
}
}
这是在发送信息的页面中。
如果您需要更多来源或信息，只需写下来。将尽快提供。
提前致谢！
I am trying to pass data between two pages using Session State in ASP.NET. The data that needs to be passed is from a GridView's Cell. So, on SelectedIndexChanged event I'm storing the data like that:
protected void GridViewEmployees_SelectedIndexChanged(object sender, EventArgs e)
{
Session["Name"] =
this.GridViewEmployees.Rows[GridViewEmployees.SelectedIndex].DataItem;
}
And then, I want to use the Session's contents in another page. The code:
protected void Page_Load(object sender, EventArgs e)
{
string name = (string)(Session["Name"]);
string[] names = name.Split(' ');
this.EntityDataSourceNorthwind.Where =
"it.[FirstName] = \'" + names[0] +
"\' AND it.[lastName] = \'" + names[1] + "\'";
}
But I get a null reference exception. Also, I have set the Session initialization on the Page_Load event and there the Session is stored and everything works just fine. I mean:
protected void Page_Load(object sender, EventArgs e)
{
if (Session["Name"] == null)
{
Session["Name"] = "Andrew Fuller";
}
}
This is in the page which sends the information.
If you need more source or info, just write it down. It will be provided ASAP.
Thanks in advance!
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评论（2）
这其实不是你的Session的问题。行的 DataItem 仅在 RowDataBound 事件期间可用。在 GridViewEmployees_SelectedIndexChanged 方法中设置断点，然后检查立即窗口中 DataItem 的值。它将为空。
This is actually not a problem with your Session. A row's DataItem is only available during the RowDataBound event. Set a break point in your GridViewEmployees_SelectedIndexChanged method, and check the value of the DataItem in your immediate window. It will be null.
两个最可能的罪魁祸首是：会话状态被禁用 (
EnableSessionState="false")，或者 Cookie 被禁用并且您没有使用 无 Cookie 会话。The two most likely culprits are either - session state is disabled (
EnableSessionState="false"), or cookies are disabled and you're not using cookieless sessions.