C＃和WPF：另一个类无法访问的控件

Question

I just started fiddling around with C# and WPF.

Let's say that I want to instantiate a Black grid and that I want to randomly move around a red square in said Grid.

Currently I can basically do whatever I want as long as I keep everything in "MainWindow.xaml.cs"...

Now, my problem is that if I create a new class (eg, "MakeStuffHappen.cs") and from it I try to access the Grid (named "MyGrid") that will be instantiated by MainWindow's constructor, intellisense doesn't "see" it. I tried making a getter that returns "MyGrid" but then the compiler says that "an object reference is required for the non-static field, method, or property 'ProjectName.MainWindow.getGrid()'. Obviously I cannot define MainWindow as a static class...

Any tips on how to solve this?

Thanks!

PS Since I'm evidently no programmer I'm not necessarily aware of the technical terms to use when looking up information... so I apologize in advance if this question has been already asked.

PPS I saw this: Access MainWIndow Control from a class in a separate file but it doesn't help.

Answer 1

Once your view is initialized (when the OnInitialized event fires) you can pass the initialized Grid into your helper class:

MainWindow.xaml.cs:

public partial class MainWindow 
{
    MakeStuffHappen helper = null;
    public MainWindow()
    { 
       OnInitialized += (s,e)=> { helper = new MakeStuffHappen(this.MyGridName); } 
    }
}

MakeStuffHappen.cs

public class MakeStuffHappen
{
    Grid theGrid = null;
    public MakeStuffHappen(Grid grid)
    {
        theGrid = grid;
        // Do stuff with the grid.
    }
}