比较2个文件C＃之间的变量

Question

我对C编码很新，最重要的是C＃，所以我遇到的问题是要了解它是如何工作的。所以我真正想要的是，当你按下一个网格时，你会得到一个唯一的id，这取决于网格中显示的项目，按下网格你将进入一个新的页面，我想显示item.id

档案1

foreach (var item in list)
 {
        TapGestureRecognizer gridTap = new TapGestureRecognizer();
        gridTap.Tapped += (sender, e) =>
        {

            Navigation.PushModalAsync(new MarketItemPage());

            item.Id = GridIdentifier.Grid_id; // item.id is the id of the choosen item = static int in class

        };

}

文件2

 public void Update()
    {
        string gridid = GridIdentifier.Grid_id.ToString();

        grid.Children.Add(new Label
        {

            Text = gridid,
            FontSize = 16,
            FontFamily = "Arial",
            TextColor = Color.Red,
            VerticalTextAlignment = TextAlignment.Center,
            HorizontalTextAlignment = TextAlignment.Center,
            HorizontalOptions = LayoutOptions.Center,

        });

    }

班级

public static class GridIdentifier
{
    public static int Grid_id { get; set; }
}