CODEWITHSUNDEEP
c#xamlcanvas
Nivert9
Nivert9

Reputation: 37

Adding elements to a XAML Canvas C#

I have a windows 8 app created in xml and using code-behind. I have a button that, when pressed, will create a canvas, and put a grid inside of it.

    private void AddClass_Click_1(object sender, RoutedEventArgs e)
    {


        SolidColorBrush greenBrush = new SolidColorBrush(Windows.UI.Colors.Green);
        Thickness size = new Thickness();

        size.Top = 20;
        size.Right = 20;
        size.Left = 20;
        size.Bottom = 20;
        Canvas newcanvas = new Canvas();
        newcanvas.Background = greenBrush;
        newcanvas.Width=500; 
        newcanvas.Height=500; 
        newcanvas.Margin=size;
        newcanvas.Name = "Class3";
        GridView temp = new GridView();
        newcanvas.Children.Add(temp);
        classes.Items.Add(newcanvas);

    }

What I need to now be able to do is, add MORE elements into the canvas I've just created, at any given time using a button, but I'm not sure how to reference this newly created canvas.

Upvotes: 1

Views: 4934

Answers (3)

har07
har07

Reputation: 89285

Since you added newly created canvas this way :

classes.Items.Add(newcanvas);

Then I think, first thing to try to access it later is from Items property of classes :

classes.Items

If you have more then one object in Items, just iterate through Items and check if the item type is Canvas.

Upvotes: 0

Thinkable
Thinkable

Reputation: 301

Simply move your Canvas declaration 

Canvas newcanvas = new Canvas();

outside the function but within the scope you plan to address it from.

Later when you want to reference it again from the code behind on your button, it will still exist.

Upvotes: 0

markmnl
markmnl

Reputation: 11426

Save a ref at the class level:

Canvas myCanvas;

then create it only the first time:

private void AddClass_Click_1(object sender, RoutedEventArgs e)
{
    if(myCanvas == null)
    {
        myCanvas = new Canvas();
        newcanvas.Background = greenBrush;
        newcanvas.Width=500; 
        newcanvas.Height=500; 
        newcanvas.Margin=size;
        newcanvas.Name = "Class3";
    }
    GridView temp = new GridView();
    newcanvas.Children.Add(temp);
    classes.Items.Add(newcanvas);
}

But why not define you Canvas in XAML? Then if you give it a name you can refer to in code-behind:

<Canvas Name="myCanvas" Width="500" ...>
</Canvas>

private void AddClass_Click_1(object sender, RoutedEventArgs e)
{
    myCanvas.Children.Add(new GridView());
}

Upvotes: 1

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