CODEWITHSUNDEEP
c#wpfdynamicuser-controlsevent-handling
Joshua
Joshua

Reputation: 13

WPF, C#: How to handle an event raised from dynamically created user controls

Basically I have two main components to my program.
1) I have my main window which contains my dynamically created user controls.
2) The two different types of user controls.(ctr1 and ctr2)
I want to be able to press a button on ctr1, have it bubble up an event and have the main window handle the event which will create another instance of ctr2. The problem I am having is that I honestly can't find any good resources that gives actual code examples of how to accomplish this.

In ctr1 I have: 

    public event RoutedEventHandler MyEvent
    {
        add { AddHandler(MyEvent_randomName, value); }
        remove { RemoveHandler(MyEvent_randomName, value); }
    }

    void RaiseMyEvent()
    {
        RoutedEventArgs newEventArgs = new RoutedEventArgs(ctr1.MyEvent_randomName);
        RaiseEvent(newEventArgs);
    }
    protected override void RaiseEvent_click()
    {
        RaiseMyEvent();
    }

and for my mainWindow I have: 

 public MainWindow()
    {
        InitializeComponent();
        MainWindow.AddHandler(ctr1.MyEvent_randomName, new RoutedEventHandler(MyButtonHandler));

    }
    void MyButtonHandler(object sender, RoutedEventArgs e)
    {
        MessageBox.Show("My New Clicked Event");
    }

Where I have been running into trouble is the "MainWindow.AddHandler(ctr1.MyEvent_random......);
I keep getting the error:
An object reference is required for the non-static field, method, or property 'System.Windows.UIElement.AddHandler(System.Windows.RoutedEvent, System.Delegate)'

Im sorry if this is a very beginner question but I only started WPF and C# a few days ago and I have yet to find a good online tutorial that explains everything plainly.

Upvotes: 1

Views: 394

Answers (2)

Georgios Tsaprazlis
Georgios Tsaprazlis

Reputation: 463

You can try this :

In ctr1

public event EventHandler Ctrl1ClickEvent;

when you press the button in ctrl1

Ctrl1ClickEvent(this, EventArgs.Empty);

In mainWindow 

public MainWindow()
{
    InitializeComponent();
    this.ctrl1.Ctrl1ClickEvent  += ctrl1ClickHandler;

}

private void ctrl1ClickHandler(object sender, EventArgs e)
{
     MessageBox.Show("My New Clicked Event");
}

Upvotes: 0

James Willock
James Willock

Reputation: 2037

Check the error:

An object reference is required for the non-static field, method, or property 'System.Windows.UIElement.AddHandler(System.Windows.RoutedEvent, System.Delegate)'

You are trying to access the method statically:

MainWindow.AddHandler . . .

When you should be doing:

AddHandler . . .

As an aside you may want to look at ICommand and MVVM to do what you want to do, but as a beginner you have a lot to learn right now ;)

Upvotes: 2

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