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 = ; i <= ; 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 = ; 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 = ;

        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 = ; i <= ; i++)

                {

                    Class1 c1 = new Class1();

                    c1.Name = "sadada" + i;

                    dg.Items.Add(c1);

                }

                data += ;

            }

        }

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