Wpf Beobachtbaren Sammlung und DataGrid keine Aktualisierung verpasst

Ich habe eine observable-collection in der Ansicht Modell, die Bindbare Basis wie folgt Bitte haben Sie einen Blick auf die MoveUp und MoveDown Methoden, bei denen Sie gebunden sind, um zwei Schaltflächen in der Ansicht. Wenn Sie jemals up-Taste gedrückt wird, möchte ich die ausgewählte Zeile in der datagrid-Schritt für Schritt bis in das basierend auf der Reihenfolge der Spalte in der Datenbank und für unten, einen Schritt nach unten.. Beide Methoden funktioniert PERFEKT. Problem ist, die änderungen angezeigt bekommt, in dem datagrid nur, wenn die gesamte Ansicht aktualisiert wird. Meine Forderung ist, wenn der button angeklickt wird, möchte ich die Ansicht automatisch aktualisiert. Ich entschuldige mich für diese lange code. Bitte Um Hilfe!!!!!. Ich habe einige cs-code als auch für die beiden up-und down-Tasten die unten angegebene viewmodel. Nur Zeiger in den code, muss betont werden, ist die ObservableCollection JobEntities, MoveUp und MoveDown Befehle.

ViewModel.cs:

public class JobConfigurationViewModel : BindableBase
{


    public JobConfigurationLogic JobConfigurationLogic =
        new JobConfigurationLogic(new JobConfigurationResultsRepository());

    public SrcDestConfigurationLogic SrcDestConfigurationLogic =
        new SrcDestConfigurationLogic(new SrcDestCofigurationRepository());

    private string _enterprise;

    public string Enterprise
    {
        get { return _enterprise; }
        set { SetProperty(ref _enterprise, value); }
    }

    private int currentJobID;
    private int currentSequence;
    private int previousJobID;
    private int previousSequence;
    private string _site;

    public string Site
    {
        get { return _site; }
        set { SetProperty(ref _site, value); }
    }

    private int _siteID;

    public int SiteID
    {
        get { return _siteID; }
        set { SetProperty(ref _siteID, value); }
    }

    private ObservableCollection<JobConfigurationResults> _jobEntities;

    public ObservableCollection<JobConfigurationResults> JobEntities
    {
        get { return _jobEntities; }
        set
        {
            SetProperty(ref _jobEntities, value); 
            this.OnPropertyChanged("JobEntities");
        }
    }

    //Source System List for Job
    private List<SourceSiteSystem> _lstJobSrcSystems;

    public List<SourceSiteSystem> LstJobSrcSystems
    {
        get { return _lstJobSrcSystems; }
        set
        {
            //Using bindable base setproperty method instead of older inotify prop changed method
            SetProperty(ref _lstJobSrcSystems, value);
        }
    }

    //Deestination  System List for Job
    private List<DestinationSiteSystem> _lstJobDestSystems;

    public List<DestinationSiteSystem> LstJobDestSystems
    {
        get { return _lstJobDestSystems; }
        set
        {
            //Using bindable base setproperty method instead of older inotify prop changed method
            SetProperty(ref _lstJobDestSystems, value);
        }
    }

    //the Selected Source Site system ID 
    private int _selectedSrcSiteSystemId = 0;

    public int SelectedSrcSiteSystemId
    {
        get { return _selectedSrcSiteSystemId; }
        set
        {
            //Using bindable base setproperty method instead of older inotify prop changed method
            SetProperty(ref _selectedSrcSiteSystemId, value);
        }
    }

    //the Selected Source Site system from the dropdown
    private SourceSiteSystem _selectedSrcSiteSystem;

    public SourceSiteSystem SelectedSrcSiteSystem
    {
        get { return _selectedSrcSiteSystem; }
        set
        {
            //Using bindable base setproperty method instead of older inotify prop changed method
            if (value != null)
            {
                SetProperty(ref _selectedSrcSiteSystem, value);
                SelectedSrcSiteSystemId = SelectedSrcSiteSystem.SiteSystemId;
            }
        }
    }

    //the Selected Destination Site system ID 
    private int _selectedDestSiteSystemId = 0;

    public int SelectedDestSiteSystemId
    {
        get { return _selectedDestSiteSystemId; }
        set
        {
            //Using bindable base setproperty method instead of older inotify prop changed method
            SetProperty(ref _selectedDestSiteSystemId, value);
        }
    }

    //the Selected Destination Site system from the dropdown
    private DestinationSiteSystem _selectedDestSiteSystem;

    public DestinationSiteSystem SelectedDestSiteSystem
    {
        get { return _selectedDestSiteSystem; }
        set
        {
            //Using bindable base setproperty method instead of older inotify prop changed method
            if (value != null)
            {
                SetProperty(ref _selectedDestSiteSystem, value);
                SelectedDestSiteSystemId = SelectedDestSiteSystem.SiteSystemId;
            }
        }
    }

    private JobConfigurationResults _jeJobConfigurationResults;

    public JobConfigurationResults JEJobConfigurationResults
    {
        get { return _jeJobConfigurationResults; }
        set { _jeJobConfigurationResults = value; }
    }

    private List<JobTaskConfiguration> _taskSelectionList = new List<JobTaskConfiguration>();

    private CancellationTokenSource _source;

    private RelayCommand<object> _commandSaveInstance;
    private RelayCommand<object> _hyperlinkInstance;
    private RelayCommand<object> _commandRunJob;
    private RelayCommand<object> _upCommand;
    private RelayCommand<object> _downCommand;
    private IEventAggregator _aggregator;


    ///<summary>
    ///This is a Subscriber to the Event published by EnterpriseViewModel
    ///</summary>
    ///<param name="agg"></param>
    public JobConfigurationViewModel(IEventAggregator agg)
    {
        _aggregator = agg;
        PubSubEvent<Message> evt = _aggregator.GetEvent<PubSubEvent<Message>>();
        evt.Subscribe(message => Enterprise = message.Enterprise.ToString(), ThreadOption.BackgroundThread);
        evt.Subscribe(message => Site = message.Site.ToString(), ThreadOption.BackgroundThread);
        evt.Subscribe(message => SiteID = message.SiteID, ThreadOption.BackgroundThread);
        //evt.Unsubscribe();
        StartPopulate();
    }

    private async void StartPopulate()
    {
        await TaskPopulate();
    }

    //This is to ensure that the publisher has published the data that is needed for display in this workspace
    private bool TaskProc()
    {
        Thread.Sleep(500);
        PubSubEvent<Message> evt = _aggregator.GetEvent<PubSubEvent<Message>>();
        evt.Subscribe(message => Enterprise = message.Enterprise.ToString(), ThreadOption.BackgroundThread);
        evt.Subscribe(message => Site = message.Site.ToString(), ThreadOption.BackgroundThread);
        evt.Subscribe(message => SiteID = message.SiteID, ThreadOption.BackgroundThread);
        return DoPopulate();
    }

    private Task<bool> TaskPopulate()
    {
        _source = new CancellationTokenSource();
        return Task.Factory.StartNew<bool>(TaskProc, _source.Token);
    }

    ///<summary>
    ///This method handles the populating of the Source and Destination Dropdowns and the Job entity and Task Datagrid
    ///  This is mainly driven by the Site selected in the previous workspace
    ///</summary>
    ///<returns></returns>

    private bool DoPopulate()
    {
        PopulateSourceDestinations(this.SiteID);

        return true;
    }

    ///<summary>
    ///this method displays all entities and tasks for the site.
    ///This is done async so that the Publisher thread is not held up
    ///</summary>
    public void GetJobConfigurationResults()
    {
        if (SelectedSrcSiteSystem == null)
        {
            SelectedSrcSiteSystem = LstJobSrcSystems[0];
        }
        if (SelectedDestSiteSystem == null)
        {
            SelectedDestSiteSystem = LstJobDestSystems[0];
        }
        SelectedSrcSiteSystemId = SelectedSrcSiteSystem.SiteSystemId;
        SelectedDestSiteSystemId = SelectedDestSiteSystem.SiteSystemId;
        var jobConfigurationResults = new JobConfigurationResults
        {
            SourceId = SelectedSrcSiteSystemId,
            DestinationId = SelectedDestSiteSystemId
        };
        JobEntities = new ObservableCollection<JobConfigurationResults>();
        JobEntities = JobConfigurationLogic.GetResults(jobConfigurationResults.SourceId,
            jobConfigurationResults.DestinationId);
        _taskSelectionList = new List<JobTaskConfiguration>(JobEntities.Count * 3);
    }

    ///<summary>
    /////Adding a method to pupulate the Source and Destination dropdown lists. 
    ///This is done async so that the Publisher thread is not held up
    ///</summary>
    ///
    ///
    public async void PopulateSourceDestinations(int siteId)
    {
        this.LstJobSrcSystems = SrcDestConfigurationLogic.LoadSourceSiteSystems(siteId);
        this.LstJobDestSystems = SrcDestConfigurationLogic.LoadDestinationSystems(siteId);
        GetJobConfigurationResults();
    }

    public ICommand HyperlinkCommand
    {
        get
        {
            if (_hyperlinkInstance == null)
                _hyperlinkInstance = new RelayCommand<object>(openDialog);
            return _hyperlinkInstance;
        }
    }

    private void openDialog(object obj)
    {
        JobConfigurationResults results = obj as JobConfigurationResults;
        JEJobConfigurationResults = JobEntities.SingleOrDefault(x => x.JobEntityId == results.JobEntityId);

    }

    public ICommand CommandSave
    {
        get
        {
            if (_commandSaveInstance == null)
                _commandSaveInstance = new RelayCommand<object>(saveJobConfigurationChanges);
            return _commandSaveInstance;
        }
    }

    public ICommand CommandRunJob
    {
        get { return _commandRunJob ?? (_commandRunJob = new RelayCommand<object>(RunJob)); }
    }

    ///<summary>
    ///this saves all the changes in the selection made by the user 
    ///</summary>
    ///<param name="ob"></param>
    public void saveJobConfigurationChanges(object ob)
    {
        foreach (var job in JobEntities)
        {
            int jobEntityId = job.JobEntityId;
            foreach (var task in job.TaskDetails)
            {
                int id = task.JobTask_ID;
                bool isSelected = task.IsSelected;
                _taskSelectionList.Add(task);
            }
        }
        JobConfigurationLogic.UpdateTaskSelection(_taskSelectionList);
    }


    public ICommand UpCommand
    {
        get
        {
            if (_upCommand == null)
                _upCommand = new RelayCommand<object>(MoveUp);
            return _upCommand;
        }
    }

    private void MoveUp(object obj)
    {

        if (obj != null)
        {
            JobConfigurationResults results = obj as JobConfigurationResults;
            currentJobID = results.JobEntityId;
            currentSequence = results.SequenceOrder - 1;
            try
            {
                JobConfigurationResults res = _jobEntities.SingleOrDefault(n => n.SequenceOrder == currentSequence);
                previousJobID = res.JobEntityId;
                previousSequence = res.SequenceOrder + 1;
                //JobConfigurationLogic.UpdateSequence(currentJobID, previousSequence, previousJobID, currentSequence);
                JobConfigurationLogic.UpdateSequence(currentSequence, currentJobID, previousSequence, previousJobID);
                OnPropertyChanged("JobEntities");
            }
            catch (NullReferenceException)
            {
                MessageBox.Show("Can't move the top record");
            }

        }
        else
        {
            MessageBox.Show("Please Select a row that you want to sort");
        }
    }

    public ICommand DownCommand
    {
        get
        {
            if (_downCommand == null)
                _downCommand = new RelayCommand<object>(MoveDown);
            return _downCommand;
        }
    }

    private void MoveDown(object obj)
    {
        if (obj != null)
        {
            JobConfigurationResults results = obj as JobConfigurationResults;
            currentJobID = results.JobEntityId;
            currentSequence = results.SequenceOrder + 1;
            try
            {
                JobConfigurationResults res = _jobEntities.SingleOrDefault(a => a.SequenceOrder == currentSequence);
                previousJobID = res.JobEntityId;
                previousSequence = res.SequenceOrder - 1;
                JobConfigurationLogic.UpdateSequence(currentSequence, currentJobID, previousSequence, previousJobID);
                OnPropertyChanged("JobEntities");
            }
            catch (NullReferenceException)
            {

                MessageBox.Show("You have reached the end");
            }

        }
        else
        {
            MessageBox.Show("Please Select a row that you want to sort");
        }
    }

    ///<summary>
    ///Execute an etl job using the current job id
    ///</summary>
    private void RunJob(object obj)
    {
        JobEngine jobEngine = new JobEngine();
        var jobId = JobEntities[0].JobId;
        jobEngine.ProcessJob(jobId);
    }
} 

CS CODE:

private void btnup_Click(object sender, RoutedEventArgs e)
{

    dgEntities.Items.Refresh();
    //dgEntities.GetBindingExpression(DataGrid.ItemsSourceProperty).UpdateTarget();
}

private void btndown_Click(object sender, RoutedEventArgs e)
{
    dgEntities.GetBindingExpression(DataGrid.ItemsSourceProperty).UpdateTarget();
}
können Sie zeigen, wie binden Sie die observable-collection? Auch sind Sie sicher, dass die Befehle ausgeführt werden, jedes mal, wenn Sie klicken Sie auf nach Oben/Unten?
Yup, für datagrid itemsource=JobEntities.. Alle Befehle funktionieren tadellos. Nur das datagrid ist nicht erfrischend.

InformationsquelleAutor nikhil | 2014-11-14

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