Infragistics UltraGrid - 当滚动到达底部时如何添加行？

Question

我有一个包含100,000条记录的表,我有一个方法(使用实体框架)检索10条记录,我给它多少条记录跳过以获得接下来的10条记录.

List<Item> GetRecords(int skip = 0);

我在列表中加载前10条记录,并将其设置为UltraGrid的数据源,如何在滚动到达底部或接近底部时调用该方法获取接下来的10条记录并将其添加到UltraGrid中？

Answer 1

我有一个满足您要求的解决方案.希望这可以帮助你..

首先,创建一个名为"test"的窗体(比如说)..在窗体中添加一个ultraGrid ..

检查以下代码:

   public partial class test : Form
   {
    DataTable dtSource = new DataTable();
    int takecount = 50;
    int skipcount = 0;
    DataTable dtResult;

    // CONSTRUCTOR
    public test()
    {
        InitializeComponent();

        // Fill Dummy data here as datasource...

        dtSource.Columns.Add("SNo", typeof(int));
        dtSource.Columns.Add("Name", typeof(string));
        dtSource.Columns.Add("Address", typeof(string));
        int i = 1;
        while (i <= 500)
        {               
            dtSource.Rows.Add(new object[] { i, "Name: " + i, "Address " + i });
            i++;
        }
        dtResult = dtSource.Copy();
        dtResult.Clear();
    }

    // ON FORM LOAD FUNCTION CALL
    private void test_Load(object sender, EventArgs e)
    {            
        ultraGrid1.DataSource = dt_takeCount();
        ultraGrid1.DataBind();


    }

    private DataTable dt_takeCount()
    {            
        if (dtSource.Rows.Count - skipcount <= takecount)
        {
            takecount = dtSource.Rows.Count - skipcount;
        }
        foreach (var item in dtSource.AsEnumerable().Skip(skipcount).Take(takecount))
        {
            dtResult.Rows.Add(new object[] { item.Field<int>("SNo"), item.Field<string>("Name"), item.Field<string>("Address") });
        }
        if (dtSource.Rows.Count - skipcount >= takecount)
        {
            skipcount += takecount;               
        }            
        return dtResult;
    }

    // EVENT FIRED WHEN ON AFTERROWREGIONSCROLL
    private void ultraGrid1_AfterRowRegionScroll(object sender, Infragistics.Win.UltraWinGrid.RowScrollRegionEventArgs e)
    {
        int _pos = e.RowScrollRegion.ScrollPosition;
        if (ultraGrid1.Rows.Count - _pos < takecount)
        {
            dt_takeCount();
        }           
    }        
}

以上代码是有效的.. - >"ultraGrid1_AfterRowRegionScroll"函数是"AfterRowRegionScroll"事件函数

- >但是请确保当你选择"takecount"时,它会生成滚动条, - >当你运行上面的代码时...当你滚动时,行会更新50,直到第500行...因为它是最后一排.