Question

I have simple Grid with Image named TestImage and I need pass that Grid instance to other class. The other class will find TestImage and it will change Source.

When I try to access to Grid from codebehind of XAML it is OK, but when I try to pass instance of Grid to other class, I can not access to TestImage there.

TestPage.xaml.cs

var otherClass = new OtherClass();
otherClass.DoSomeStuff(this.GridName);

OtherClass.cs

public void DomeSomeStuff(Grid gridInstance)
{
    gridInstance.TestImage.Source = ....;
}

And I will get error message:

‘Windows.UI.Xaml.Controls.Grid’ does not contain a definition for
‘TestImage’ and no extension method ‘TestImage’ accepting a first
argument of type ‘Windows.UI.Xaml.Controls.Grid’ could be found

I understand this error, but I do not known, how to fix it.

Can you help me please?
Thank you.

Answer 1

Try this:

public void DomeSomeStuff(Grid gridInstance)
{
    var image = VisualTreeHelper.GetChild(gridInstance, 0) as Image;
    // or var image = gridInstance.Children[0] as Image;
    // or var image = gridInstance.FindName("TestImage") as Image;
    if (image != null)
        image.Source = ...;
}