DataGrid缓冲加载数据

   当datagrid的滚动条拉到4/3的时候去加载数据。。

public MainWindow()
        {
            InitializeComponent();
            
            for (int i = 1; i <= 34; i++)
            {
                Class1 c1 = new Class1();
                c1.Name = "sadada" + i;
                dg.Items.Add(c1);
            }
            
        }
        private static T GetVisualChild<T>(DependencyObject parent) where T : Visual
        {
            T child = default(T);
            int numVisuals = VisualTreeHelper.GetChildrenCount(parent);
            for (int i = 0; i < numVisuals; i++)
            {
                Visual v = (Visual)VisualTreeHelper.GetChild(parent, i);
                child = v as T;
                if (child == null)
                {
                    child = GetVisualChild<T>(v);
                }
                if (child != null)
                {
                    break;
                }
            }
            return child;
        }
        int data = 20;
        private void dg_LayoutUpdated(object sender, EventArgs e)
        {
            ScrollViewer scrollViewer = GetVisualChild<ScrollViewer>(dg);
            double Position = scrollViewer.ContentVerticalOffset;
            if (Position >= data)   //当拖动的数据条数超过的时候再去加
            {
                for (int i = 1; i <= 20; i++)
                {
                    Class1 c1 = new Class1();
                    c1.Name = "sadada" + i;
                    dg.Items.Add(c1);
                }
                data += 20;
            }
            
        }

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