Question

I’m having some issues updating a dependency property from a standard property.

If I set the property to null or update it with new data I was under the impression that it would reset the dependency property. However it looks as tho it just piles the new data on top.

Here’s a couple of properties / dependency properties I’m using:

Dependency Properties

public static readonly DependencyProperty DataTableChartProperty = DependencyProperty.Register
    ("DataTableChart", typeof(DataTable), typeof(MainWindowViewModel));

public static readonly DependencyProperty ContentElementProperty = DependencyProperty.Register
    ("ContentElement", typeof(FrameworkElement), typeof(MainWindowViewModel));

Standard Properties

public DataTable DataTableChart
{
    get { return (DataTable)this.GetValue(DataTableChartProperty); }
    set { this.SetValue(DataTableChartProperty, value); }

public FrameworkElement ContentElement
{
    get { return (FrameworkElement)this.GetValue(ContentElementProperty); }
    set { this.SetValue(ContentElementProperty, value); }
}

I would greatly appreciate any suggestions. Thanks in Advance!

This is how I’m setting it for now… for testing…

void _bw_DoWork(object sender, DoWorkEventArgs e)
    {
        var loadLog = new LoadLog();
        e.Result = loadLog.LoadCaseLogs(SelectedFiles);
    }

    void _bw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
        DataTableChart = null;
        ContentElement = null;
        ContentElement = blah;
        DataTableResult = e.Result as DataTable;
        DataTableChart = caseData.LoadUserData(DataTableResult);

        LoadingScreen = false;
    }

public ChartControl blah = new ChartControl();

Answer 1

Dependency properties are cleared using the ClearValue method, setting it to null is just setting it to null, which is not the same.