Question

I have a strange problem in my project. There are pages made from usercontrol and menu bar (also usercontrol).

Here is my usercontrol that contains few buttons

public partial class UpperBar : UserControl
{       
    public UpperBar()
    {
        InitializeComponent();
    }

    public event EventHandler EventbtClicked;
    private void btConnect_Click(object sender, System.Windows.RoutedEventArgs e)
    {
        EventbtClicked(this, e);
    }    
}

I added this in my page as follows:

<local:UpperBar VerticalAlignment="Top" Grid.Row="0" Height="78" Grid.ColumnSpan="3" Margin="0,2,0,0"/>

And in my page tried to call event:

public PageStatus()
{
    InitializeComponent();
    Plc.ExecuteRefresh += new EventHandler(RefreshLeds);


   UpperBar.EventbtCliced += new EventHandler(UpperBatButtonClick);  
}

protected void UpperBarButtonClick(object sender, EventArgs e)
{
    //do something
}

But I can’t access my event using this UpperBar.EventbtCliced, why ?

Answer 1

You need to access the instance of your class UpperBar in PageStatus, not the class UpperBar itself!

The easiest way for you here:

• Name your UpperBar in your XAML, example:

<local:UpperBar x:Name="_myBar" x:FieldModifier="private"/>

• Then use this instance in your PageStatus.xaml.cs:

  public partial class MainWindow : Window    {
  public MainWindow()
  {
      InitializeComponent();
  
      _myBar.EventbtClicked += new EventHandler(UpperBarButtonClick);
  }
  
  protected void UpperBarButtonClick(object sender, EventArgs e)
  {
      //do something
  }
  

  }

Now if you are working seriously in WPF, you should really learn about Databinding and MVVM, catching event this way is not the best way to do it at all.