[asp.net]ashx中session存入，aspx为null的原因（使用flash uploader）

I am using uploadify to upload files, they automatically post to the handler. I then modify the session in the handler that I have setup as a static property in a common class of the website. I then try to access that same session in the aspx page, and the value is null. I have a feeling this is because of cookies, but there needs to be a way to work around this without exposing the sessionid in the url.

Solutions

I found the answer: When the handler is being called from FLASH (like swfupload or uploadify) it does not pass the current sessionid to the handler. The handler then creates a NEW session. To fix this, do the following:

$(Selector).uploadify({
swf: 'uploadify.swf',
uploader: 'Upload.ashx?ASPSESSID=<%=Session.SessionID%>'
});

Add to: Global.asax:

void Application_BeginRequest(object sender, EventArgs e)
{
try
{
string session_param_name = "ASPSESSID";
string session_cookie_name = "ASP.NET_SESSIONID";
string session_value = Request.Form[session_param_name] ?? Request.QueryString[session_param_name];
if (session_value != null) { UpdateCookie(session_cookie_name, session_value); }
}
catch (Exception) { }
}

void UpdateCookie(string cookie_name, string cookie_value)
{
HttpCookie cookie = HttpContext.Current.Request.Cookies.Get(cookie_name);
if (cookie == null)
{
HttpCookie cookie1 = new HttpCookie(cookie_name, cookie_value);
Response.Cookies.Add(cookie1);
}
else
{
cookie.Value = cookie_value;
HttpContext.Current.Request.Cookies.Set(cookie);
}
}

如果有表单验证，请继续查看http://stackoverflow.com/questions/14465314/how-to-access-session-in-aspx-that-was-modified-in-ashx#comment20148862_14465314