Using Async-methods to load appointments

[Chris Gårdenberg]

Hi.

I'm trying to boost the performance by loading appointments with a async-method.
But it doesn't seem to work.

Here's my code:

        IAsyncResult beginLoad(Object sender, EventArgs e, AsyncCallback cb, object state)
        {
            return loadActivityDataAsync(cb, state);
        }


        private void loadActivityData()
        {
            DateTime startDate = radSched.VisibleRangeStart;
            //6 veckor
            DateTime endDate = radSched.VisibleRangeEnd;

            //Om sista veckan är helt utanför månaden

            actList = Activity.getActivities(Master.DB, Master.AresUser.UserID, startDate.AddMonths(-1), endDate.AddMonths(1), cbxShowCompleted.Checked);

            if (actList != null)
            {
                string[] str = new string[actList.Count];
                bool hasCompanies = false;

                for (int i = 0; i < str.Length; i++)
                {
                    hasCompanies = true;
                    str[i] = actList[i].Company_Entityid.ToString();
                }

                if (hasCompanies)
                    companies = Master.DB.executeDataTable("SELECT * FROM company WHERE author_companyid = " + Master.AresUser.CompanyID + " AND entityID IN (" + string.Join(",", str) + ")");
                else
                    companies = new DataTable();

                //lblTest.Text = "Start: " + DateTime.Now.ToLongTimeString();
            }
        }

        private void EndLoadActivityData(IAsyncResult res)
        {
            radSched.Rebind();
            //lblTest.Text = "Stop: " + DateTime.Now.ToLongTimeString() + " Items: " + actList.Count; ;
        }

        private delegate void GenericDelegate();

        private IAsyncResult loadActivityDataAsync(AsyncCallback cb, object state)
        {
            GenericDelegate gd = loadActivityData;
            return gd.BeginInvoke(cb, state);
        }

And I call the function by running this code:

PageAsyncTask task = new PageAsyncTask(beginLoad, EndLoadActivityData, null, null);
Page.RegisterAsyncTask(task);

actList is a List<T>

If I run this without the async it works perfectly. Otherwise I get a blank scheduler, and some appointments in my actList.

[Dimitar Milushev]

Hello Chris Gårdenberg,

Can you please try using the Page.AddOnPreRenderCompleteAsync method to call the RadScheduler's Rebind() method instead of relying on the on the EndHandler of the PageAsyncTask?

Sincerely yours,
Dimitar Milushev
the Telerik team

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