[CLOSED] ProgressBar Server Side Update

[Marcelo]

Hi,
I have a little problem.

When I try to use the progressBar, based on this example https://examples1.ext.net/#/Miscella...r_Side_Update/, I had a surprise.

In some parts of my code I use System.Web.HttpContext.Current.Session to get the session variables, like current connection, some settings, and other things.

When I use threading the System.Web.HttpContext.Current is null :(

I know, I can use this.Session to get the Session, but no working in that case, because I call this on another dll in a static method.

There is another way to do this?
Or I really have to change my app?

[Daniil]

Hi,

You should be able to pass all data that you need to a thread from a main thread.

Sure, if that data will not be changed during executing of a thread and that thread will require that changed data.

Maybe, it's possible to pass that changed data to a started thread, but I don't know how, I've never faced with such requirement before.

[Marcelo]

Hi Daniil,

You should be able to pass all data that you need to a thread from a main thread.

I tried to pass Current.Context and pass to HttpContext.Current on thread, something like this

HttpContext.Current = (HttpContext)state;

I tried to use a PageAsyncTask, and register a asynchronous task, but in this case the SessionId changes, so, not work too.

Sure, if that data will not be changed during executing of a thread and that thread will require that changed data.

I need to change the data and update them, and keep this on memory.

I've never faced with such requirement before.

Me neither :)


The solution I have found, I realy don't know if is the better one, I create a direct method and call this on update task listener, and define my interval to 250.

That's works, but I really don't know if is the best solution, for me, it's a workaround ... lol

Did you have another idea?

[Daniil]

If you'd provide us with a simple sample to reproduce the requirement and problem, we will look into it.

It's hard to suggest something without a sample.

[Marcelo]

Sorry, my fault ...
Here is a simple example, I used this example https://examples1.ext.net/#/Miscella...r_Side_Update/ to create my own.

Code behind:

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Collections.Generic;
using Ext.Net;
using System.Threading;

namespace BaseExample
{
    public partial class _Default : System.Web.UI.Page
    {

        protected void StartLongAction(object sender, DirectEventArgs e)
        {
            this.Session["LongActionProgress"] = 0;
            ThreadPool.QueueUserWorkItem(LongAction, Context);
            ResourceManager1.AddScript("{0}.startTask('longactionprogress');", TaskManager1.ClientID);
        }

        private void LongAction(object state)
        {
            //I tried something like this...
            HttpContext.Current = (HttpContext)state;
            // but the HttpContext.Current.Session is null

            for (int i = 0; i < 10; i++)
            {
                Thread.Sleep(1000);

                /*
                 * here is the problem.
                 * I have to use the HttpContext.Current.Session["LongActionProgress"] , not  this.Session["LongActionProgress"].
                 * to get some Session variables.
                 * Because some values are defined outside the assembly, in another DLL's I change the Session variables values using HttpContext.Current.Session
                 */

                HttpContext.Current.Session["LongActionProgress"] = i + 1;
            }

            HttpContext.Current.Session.Remove("LongActionProgress");
        }

        protected void RefreshProgress(object sender, DirectEventArgs e)
        {
            object progress = HttpContext.Current.Session["LongActionProgress"];

            if (progress != null)
            {
                Progress1.UpdateProgress(((int)progress) / 10f, string.Format("Step {0} of {1}...", progress.ToString(), 10));
            }
            else
            {
                ResourceManager1.AddScript("{0}.stopTask('longactionprogress');", TaskManager1.ClientID);
                Progress1.UpdateProgress(1, "All finished!");
            }
        }

        protected void Page_Load(object sender, EventArgs e)
        {
        }
    }
}

Markup:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="BaseExample._Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %>
<%@ Register Assembly="BaseExample" Namespace="BaseExample" TagPrefix="example" %>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="Form1" runat="server">
        <ext:ResourceManager ID="ResourceManager1" runat="server" />
        <h1>Progress Bar</h1>
        <p>The example shows how to update the ProgressBar during long server-side actions.</p>
        
        <ext:Button ID="ShowProgress1" runat="server" Text="Start long action">
            <DirectEvents>
                <Click OnEvent="StartLongAction" />
            </DirectEvents>
        </ext:Button>
        
        <br />
        
        <ext:ProgressBar ID="Progress1" runat="server" Width="300" />
        
        <ext:TaskManager ID="TaskManager1" runat="server">
            <Tasks>
                <ext:Task 
                    TaskID="longactionprogress"
                    Interval="1000" 
                    AutoRun="false"
                    OnStart="
                        #{ShowProgress1}.setDisabled(true);"
                    OnStop="
                        #{ShowProgress1}.setDisabled(false);">
                    <DirectEvents>
                        <Update OnEvent="RefreshProgress" />
                    </DirectEvents>                    
                </ext:Task>
            </Tasks>
        </ext:TaskManager>
  
    </form>
</body>
</html>

Just run and push "Start long action" button...

[Daniil]

Thanks for the sample.

But, unfortunately, I still can't to suggest anything.

I've a bit searched on the internet with that request:

access Session in another thread

and got a lot of discussions on this topic.

You could investigate them, probably, there is a solution.