好的,所以我在网站的登录页面上进行了一系列异步Web服务调用。我想将这些调用的结果设置为session,以便稍后可以使用它们,但我不能,因为HttpContext.Current
在回调中为空。基本上,我想做这样的事情:
public ActionResult Something()
{
GetLoans(); //each of these is async
GetPartInfo(); //and sets its result to session
GetOtherAsyncStuff(); //(or at least it needs to)
//lots of other stuff
Return View();
}
GetLoans()
看起来像这样:
public IAsyncResult GetLoans()
{
IAsyncResult _ar;
GetLoansDelegate d_Loans = new GetLoansDelegate(GetLoansAsync);
_ar = d_Loans.BeginInvoke(parameter1,parameter2, GetLoansCallback, new object()); //new object() is just a placeholder for the real parameters im putting there
return _ar;
}
异步调用GetLoansAsync
,其回调为GetLoansCallback()
,如下所示:
private void GetLoansCallback(IAsyncResult ar)
{
AsyncResult result = (AsyncResult)ar;
GetLoansDelegate caller = (GetLoansDelegate)result.AsyncDelegate;
List<Loan> loans = caller.EndInvoke(ar);
Session["Loans"] = loans; //this call blows up, since HttpContext.Current is null
}
我无法实现自定义会话提供程序,因此我必须坚持使用我所拥有的内容。因此,我无法在异步回调中为会话设置任何内容。有办法解决这个问题吗?
答案 0 :(得分:2)
您可以查看此博文。
基本上,它表示HttpContext在完成工作时无法使用(即在回调中),看起来你必须将会话操作移到GetLoansAsync方法中。