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I have a requirement where I need to load data using a background worker thread and display on a grid (mentioned above in the pict) based upon a column "Status" (highlighted in box). When I have observed the logic for populating the data I have found that CastNo with Status as "Closed" is taking too much time to load which eventually freezes the UI and users are always getting time out error. So I have written the logic in such a way that when user selects the cast with status "Closed,InspectionCompleted",Aborted"& Casting" I will first load the casts which are not in Closed status in the main thread and display the value in the grid. After that I will load the casts in a sep. BackgroundWorker thread and load the data at the end of the grid asynch. with out disturbing the UI. The issue I face is I am able to fetch values in different threads but Grid is not refreshing or loading data related to status "Closed" which is being fetched by a Background thread. Can someone please suggest me a solution .I am using MVP pattern for my project. Detailed explanation of the code is mentioned below.
First in MainView.cs I have a property as :
///
/// place where cast is loaded in MainView.cs
///
IList IMainView.CastDetailsComposites
{
get
{
return GridMaster as IList;
}
set
{
CastDetailsComposite currentSelection = _keopsGridMaster.GetSelectedEntity();
_bindingSourceMaster.DataSource = value;
}
}
in My Main Presenter I have written the code as mentioned below.
public class MainPresenter : MainPresenterBase
{
private readonly BackgroundWorker _backgroundWorkerCastProcess;
private static IList _castresults;
///
/// Parameterless constructor for CAB Constructor
///
public MainPresenter()
{
_backgroundWorkerCastProcess = new BackgroundWorker();
_backgroundWorkerCastProcess.DoWork += OnCastHistoryProcess;
_backgroundWorkerCastProcess.RunWorkerCompleted += OnCastHistoryProcessCompleted;
}
//Method LoadData will be called when user click on "Search" button from the main screen.
///
/// Coding for loading data with Casts which are in InspectionCompleted",Aborted" & Casting
///
public override void LoadData()
{
try
{
//Below method fetches data from DB with status InspectionCompleted",Aborted" & Casting status .
//This runs in the main UI thread
View.CastDetailsComposites = Model.GetCastDetails(View.SelectedProductType,
View.SelectedCastingCenter,
View.SelectedAlloyCode,
View.SelectedDimension, View.GivenCastNumber,
View.StartDate, View.EndDate, View.SelectedCastStatusIDs);
///Running the Async worker here
if (!_backgroundWorkerCastProcess.IsBusy)
{
_backgroundWorkerCastProcess.RunWorkerAsync();
}
}
}
catch (Exception ex)
{
ExceptionManager.HandleException(ex, ExceptionPolicies.Presenter);
}
finally
{
Cursor.Current = Cursors.Default;
}
}
//Code for fetching Casts which are in "Closed" status this will be running the BackgroundWorker thread
private void OnCastHistoryProcess(object sender, DoWorkEventArgs e)
{
try
{
********************************************************************
//Code for fetching data in the Background Worker thread.
//I am storing the lists of Casts which are in Closed status in a List object : castresults
_castresults = Model.GetCastDetailsClosed(View.SelectedProductType,
View.SelectedCastingCenter,
View.SelectedAlloyCode,
View.SelectedDimension, View.GivenCastNumber,
View.StartDate, View.EndDate, View.SelectedCastStatusIDs);
}
catch (Exception ex)
{
ExceptionManager.HandleException(ex, ExceptionPolicies.LogOnly);
}
}
//Finally I am assigning the list back to the view at the below method.
private void OnCastHistoryProcessCompleted(object sender, RunWorkerCompletedEventArgs e)
{
// In case the screen was closed by the user before the operation completed.
if (View != null)
{
View.CastDetailsComposites = _castresults;
View.Refresh();
}
}
But what I am getting is even though the list castresults gives all the casts which are in Closed,InspectionCompleted",Aborted" & Casting status grid is not refreshed and I am always getting casts without "Closed" status. Can anyone suggest me whether I am doing something wrong here or any UltraGrid property or something I need to change to make sure that UltraGrid can accept the data in an async way.
Note: I have set the Property : DisplayLayout->LoadStyle as LoadOnDemand . but still I am not able to refresh the grid. Please provide me an answer at the earliest .I am on the verge of deadline.
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After loading Casts with Status which are not in Closed status I am trying to load the casts which are in Closed status which is not happening.
Regards
-pep