Uploadify ashx文件Context.Session获取null

Question

我在我的网站上有一个文件上传,这是使用uploadify完成的,它使用ashx页面将文件上传到数据库.它在IE中工作正常,但在Mozilla中,context.Session变为null.我也习惯于IReadOnlySessionState读取会话.

我怎么能像IE一样在Mozilla中获得会话.

这是我做过的ashx代码

public class Upload : IHttpHandler, IReadOnlySessionState 
{    
    HttpContext context;
    public void ProcessRequest(HttpContext context)
    {
        string UserID = context.Request["UserID"];

        context.Response.ContentType = "text/plain";
        context.Response.Expires = -1;
        XmlDocument xDoc = new XmlDocument();
        HttpPostedFile postedFile = context.Request.Files["Filedata"];
        try
        {
            if (context.Session["User"] == null || context.Session["User"].ToString() == "")
            {
                context.Response.Write("SessionExpired");
                context.Response.StatusCode = 200;
            }
            else
            {
                  // does the uploading to database
            }
        }
   }
}

在IE中Context.Session["User"]总是有值,但在Mozilla中它始终为null

Answer 1

您需要添加sessionId以上传post params并在OnBeginRequest上的global.asax上恢复服务器端的ASP.NET_SessionId cookie.它实际上是闪存和cookie的错误.

我已经为会话和auth cookie恢复创建了模块,以获得工作flash和asp.net会话,所以我认为它对你有用:

public class SwfUploadSupportModule : IHttpModule
{
    public void Dispose()
    {
        // clean-up code here.
    }

    public void Init(HttpApplication application)
    {
        application.BeginRequest += new EventHandler(OnBeginRequest);
    }

    private void OnBeginRequest(object sender, EventArgs e)
    {
        var httpApplication = (HttpApplication)sender;

        /* we guess at this point session is not already retrieved by application so we recreate cookie with the session id... */
        try
        {
            string session_param_name = "ASPSESSID";
            string session_cookie_name = "ASP.NET_SessionId";
            if (httpApplication.Request.Form[session_param_name] != null)
            {
                UpdateCookie(httpApplication, session_cookie_name, httpApplication.Request.Form[session_param_name]);
            }
            else if (httpApplication.Request.QueryString[session_param_name] != null)
            {
                UpdateCookie(httpApplication, session_cookie_name, httpApplication.Request.QueryString[session_param_name]);
            }
        }
        catch
        {
        }

        try
        {
            string auth_param_name = "AUTHID";
            string auth_cookie_name = FormsAuthentication.FormsCookieName;

            if (httpApplication.Request.Form[auth_param_name] != null)
            {
                UpdateCookie(httpApplication, auth_cookie_name, httpApplication.Request.Form[auth_param_name]);
            }
            else if (httpApplication.Request.QueryString[auth_param_name] != null)
            {
                UpdateCookie(httpApplication, auth_cookie_name, httpApplication.Request.QueryString[auth_param_name]);
            }
        }
        catch
        {
        }            
    }

    private void UpdateCookie(HttpApplication application, string cookie_name, string cookie_value)
    {
        var httpApplication = (HttpApplication)application;

        HttpCookie cookie = httpApplication.Request.Cookies.Get(cookie_name);
        if (null == cookie)
        {
            cookie = new HttpCookie(cookie_name);
        }
        cookie.Value = cookie_value;
        httpApplication.Request.Cookies.Set(cookie);
    }
}

还需要在web.config上注册以上模块:

<system.webServer>
  <modules runAllManagedModulesForAllRequests="true">
    <add name="SwfUploadSupportModule" type="namespace.SwfUploadSupportModule, application name" />
  </modules>
</system.webServer>