SilverLight Loading Objects

Yes.  I set all my providers typically to IntiatlLoadEnabledd  = false and use a helper class to control the load.  I also cover up the screen with semi-transaparent grid to keep the user from clicking anywhere.  Once load is completed, you can hide the curtain.

Something like this:

 

using System;

using System.Collections.Generic;

using Csla.Silverlight;

public class DataProviderLoadController

{

    private Dictionary<CslaDataProvider, bool> _providers;

    private EventHandler _completedHandlers;

    public event EventHandler LoadAllCompleted

    {

        add

        {

            _completedHandlers = (EventHandler)System.Delegate.Combine(_completedHandlers, value);

            CheckAll();

        }

        remove

        {

            _completedHandlers = (EventHandler)System.Delegate.Remove(_completedHandlers, value);

        }

    }

 

    private DataProviderLoadController() { }

 

 

    public DataProviderLoadController(params object[] providers)

    {

        _providers = new Dictionary<CslaDataProvider, bool>();

 

        foreach (CslaDataProvider item in providers)

        {

            _providers.Add(item, item.Data != null);

            item.DataChanged += new EventHandler(item_DataChanged);

        }

 

        CheckAll();

 

        foreach (CslaDataProvider item in providers)

        {

            if (item.IsInitialLoadEnabled == false)

            {

                item.Refresh();

            }

        }

    }

 

    private void item_DataChanged(object sender, EventArgs e)

    {

        CslaDataProvider provider = sender as CslaDataProvider;

        if (provider.Error != null)

            _providers[provider] = true;

        if (provider.Data != null)

            _providers[provider] = true;

        CheckAll();

    }

 

    private void CheckAll()

    {

        bool alldone = true;

        foreach (var item in _providers.Values)

        {

            if (!item)

                alldone = false;

        }

 

        if (alldone)

        {

            if (_completedHandlers != null)

            {

                _completedHandlers.Invoke(this, EventArgs.Empty);

                foreach (var item in _providers.Keys)

                {

                    item.DataChanged -= new EventHandler(item_DataChanged);

                }

                _providers.Clear();

            }

        }

    }

}

 

 

Sergey Barskiy

Principal Consultant

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