CODEWITHSUNDEEP
c#wpfxamlmvvm
erexo
erexo

Reputation: 533

WPF initialize object in code behind and use that object in viewmodel

I need to initialize object in xaml.cs code behind and then use that object in my binded viewmodel. But when I do that the object properly initialize, but viewmodel acts like it's still null.

MainWindow.xaml

<oxys:PlotView x:Name="dataPlot" Model="{Binding DataPlotModel}" Margin="10,10,185,39"/>

MainWindow.xaml.cs

MainWindowViewModel viewModel;

public MainWindow()
{
    viewModel = new MainWindowViewModel();
    DataContext = viewModel;

    InitializeComponent();

    PlotModel DataPlotModel = new PlotModel();
    dataPlot.Model = DataPlotModel;
}

MainWindowViewModel.cs

public PlotModel DataPlotModel { get; set; }

And the DataPlotModel in viewmodel is always null unless I initialize it strictly in viewmodel.

Upvotes: 0

Views: 1585

Answers (1)

mm8
mm8

Reputation: 169200

You need to set the DataPlotModel property of the view model somewhere:

MainWindowViewModel viewModel;

public MainWindow()
{
    viewModel = new MainWindowViewModel();
    DataContext = viewModel;

    InitializeComponent();

    viewModel.DataPlotModel = new PlotModel(); //<-- Set the view model property
}

You should set the view model property rather than setting the property of control directly as this will break the binding.

Upvotes: 3

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