滚动加载数据

using DevExpress.XtraGrid.Views.Grid;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace demo1
{
    /// <summary>
    /// 个人QQ群：298515749
    /// </summary>
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        /// <summary>
        /// 数据源
        /// </summary>
        DataTable dt = new DataTable();

        private void Form1_Load(object sender, EventArgs e)
        {
            dt.Columns.Add("A1");
            dt.Columns.Add("A2");
            dt.Columns.Add("A3");
            dt.Columns.Add("A4");
            gridControl1.DataSource = dt;
        }

        #region 无数据时显示样式
        private void gridView1_CustomDrawEmptyForeground(object sender, DevExpress.XtraGrid.Views.Base.CustomDrawEventArgs e)
        {
            if (gridView1.RowCount == 0)
            {
                string str = "没有绑定数据,双击可绑定数据!";
                Font f = new Font("华文新魏", 14, FontStyle.Italic);
                Rectangle r = new Rectangle(e.Bounds.Top + 5, e.Bounds.Left + 30, e.Bounds.Right - 5, e.Bounds.Height - 5);
                e.Graphics.DrawString(str, f, Brushes.Blue, r);
            }
        }
        #endregion

        #region 双击绑定数据
        private void gridView1_Click(object sender, EventArgs e)
        {
            if (gridView1.RowCount == 0)
            {
                for (int i = 0; i < 30; i++)
                {
                    dt.Rows.Add("数据00" + i, "数据XX" + i, "数据MM" + i, "数据DD" + i);
                }
            }
        }
        #endregion

        #region 滚动至底部加载下一页，这里为补加数据（无限滚动则无限补加）
        private void gridView1_TopRowChanged(object sender, EventArgs e)
        {
            if (gridView1.IsRowVisible(gridView1.RowCount - 1) == RowVisibleState.Visible)//判定是否到最后一行
            {
                int count = gridView1.RowCount;
                for (int i = 0; i < 30; i++)
                {
                    dt.Rows.Add("数据00" + (i + count), "数据XX" + (i + count), "数据MM" + (i + count), "数据DD" + (i + count));
                }
            }
        }
        #endregion

    }
}