ASP.NET：访问 global.asax 中的会话变量
我有一个 ASP.NET 应用程序，在 Global.asax '应用程序错误事件中，我正在调用一个方法来跟踪/记录错误。 我想在这里使用会话变量内容。 我使用下面的代码，
void Application_Error(object sender, EventArgs e)
{
//get reference to the source of the exception chain
Exception ex = Server.GetLastError().GetBaseException();
//log the details of the exception and page state to the
//Windows 2000 Event Log
GUI.MailClass objMail = new GUI.MailClass();
string strError = "MESSAGE: " + ex.Message + "<br><br><br>" + "SOURCE: " + ex.Source + "<br>FORM: " + Request.Form.ToString() + "<br>QUERYSTRING: " + Request.QueryString.ToString() + "<br>TARGETSITE: " + ex.TargetSite + "<br>STACKTRACE: " + ex.StackTrace;
if (System.Web.HttpContext.Current.Session["trCustomerEmail"] != null)
{
strError = "Customer Email : " + Session["trCustomerEmail"].ToString() +"<br />"+ strError;
}
//Call a method to send the error details as an Email
objMail.sendMail("[email protected]", "[email protected]", "Error in " + Request.Form.ToString(), strError, 2);
}
在访问会话变量的代码行中出现错误。 Visual Studio 告诉我们
会话在此上下文中不可用
我怎样才能摆脱这个问题？
I have an ASP.NET application and in the Global.asax ' Application Error Event, I am calling a method to trace/log the error. I want to use the session variable content here. I used the below code
void Application_Error(object sender, EventArgs e)
{
//get reference to the source of the exception chain
Exception ex = Server.GetLastError().GetBaseException();
//log the details of the exception and page state to the
//Windows 2000 Event Log
GUI.MailClass objMail = new GUI.MailClass();
string strError = "MESSAGE: " + ex.Message + "<br><br><br>" + "SOURCE: " + ex.Source + "<br>FORM: " + Request.Form.ToString() + "<br>QUERYSTRING: " + Request.QueryString.ToString() + "<br>TARGETSITE: " + ex.TargetSite + "<br>STACKTRACE: " + ex.StackTrace;
if (System.Web.HttpContext.Current.Session["trCustomerEmail"] != null)
{
strError = "Customer Email : " + Session["trCustomerEmail"].ToString() +"<br />"+ strError;
}
//Call a method to send the error details as an Email
objMail.sendMail("[email protected]", "[email protected]", "Error in " + Request.Form.ToString(), strError, 2);
}
I am getting an error in the line of code where I am accessing the session variable. Visual Studio is telling that
Session is not available in this context
How can I get rid of this?
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评论（3）
如果你这样做的话应该会起作用：
因为这就是我自己所做的。
您到底是什么意思：Visual Studio 告诉您“会话在此上下文中不可用”？ 您是否遇到编译器错误或运行时异常？
您可以尝试采取更多防御措施并测试是否确实存在当前的 HttpContext 和 Session：
It should work if you do it like this:
Because that is what I do myself.
What exactly do you mean with: Visual Studio is telling that "Session is not available in this context"? Do you get a compiler error or a run-time exception?
You could try to be more defensive and test if there actually is a current HttpContext and a Session:
我认为应用程序错误是特定于整个应用程序的，而会话是特定于用户的。 也许您可以抛出自己的异常，将会话中的信息保存在异常中。
I think applicaiton error is specific for the whole application and a session is specific for the user. Maybe you can throw your own Exception where you save the information from the session inside your exception.
你可以尝试这样：
那么你必须使用这样的：
但是如果在加载Session对象之前抛出异常，那么它将为null
You may try this:
then you must use is like this:
but if the exception was thrown before the Session object is loaded, it will be null