RaxDataGridView

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace Example
{
    public partial class RaxDataGridView : DataGridView
    {
        public RaxDataGridView()
        {
            InitializeComponent();
        }

        private DataSet ds = new DataSet();
        private int intToltalPage = 1;
        private int intNowPage = 1;
        private int intOnePageRow;
        private int intNowRowNo = 0;

        [Category("Rax")]
        public int PageSize
        {
            get
            {
                return intOnePageRow;
            }
            set
            {
                if (value > 0)
                {
                    intOnePageRow = value;
                }
            }
        }
        public int CurrentPage
        {
            get
            {
                return intNowPage;
            }
        }
        public int Toltal_Page
        {
            get
            {
                return intToltalPage;
            }
        }

        public void RaxDataGridView_DataSourceChanged(Object sender, System.EventArgs e)
        {
            DataGridView dataGridView = (DataGridView)sender;
            DataTable dtl = (DataTable)dataGridView.DataSource;
            if (dtl.Rows.Count > 0)
            {
                intToltalPage = 1;
                intNowPage = 1;
                if (PageSize != 0)
                {
                    int intTotal = dtl.Rows.Count;
                    int intTempPage = intTotal / PageSize;
                    if (intTotal % PageSize > 0)
                    {
                        intTempPage++;
                    }
                    //if (intTempPage * PageSize > intTotal)
                    //{
                    //    intToltalPage = intTempPage;
                    //}
                    //else
                    //{
                    //    intToltalPage = intTempPage + 1;
                    //}
                    intToltalPage = intTempPage;
                    intNowRowNo = 0;
                    ds.Tables.Clear();
                    for (int i = 0; i < intToltalPage; i++)
                    {
                        DataTable tempTable = new DataTable();
                        for (int j = 0; j < dtl.Columns.Count; j++)
                        {
                            DataColumn dcol = new DataColumn();
                            dcol.ColumnName = dtl.Columns[j].ColumnName;
                            tempTable.Columns.Add(dcol);
                        }
                        for (int s = 0; s < PageSize; s++)
                        {
                            if (intNowRowNo != dtl.Rows.Count)
                            {
                                tempTable.ImportRow(dtl.Rows[intNowRowNo]);
                                intNowRowNo++;
                            }
                        }
                        ds.Tables.Add(tempTable);
                    }
                    if (ds.Tables.Count > 0)
                    {
                        dtl.Rows.Clear();
                        for (int n = 0; n < PageSize; n++)
                        {
                            dtl.ImportRow(ds.Tables[0].Rows[n]);
                        }
                    }
                }
            }
            dataGridView.DataSource = dtl;
        }

        public void ToNext()
        {
            DataTable dtl = (DataTable)this.DataSource;
            if (this.DataSource == null)
            {
                return;
            }
            if (intNowPage == intToltalPage)
            {
                //MessageBox.Show("提示", "已经到最后一页", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            else
            {
                dtl.Rows.Clear();
                for (int i = 0; i < ds.Tables[intNowPage].Rows.Count; i++)
                {
                    dtl.ImportRow(ds.Tables[intNowPage].Rows[i]);
                }
                intNowPage++;
            }
            this.DataSource = dtl;
        }
        public void ToUp()
        {
            DataTable dtl = (DataTable)this.DataSource;
            if (this.DataSource == null)
            {
                return;
            }
            if (intNowPage == 1)
            {
                //MessageBox.Show("提示", "已经到第一页", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            else
            {
                dtl.Rows.Clear();
                for (int i = 0; i < ds.Tables[intNowPage - 2].Rows.Count; i++)
                {
                    dtl.ImportRow(ds.Tables[intNowPage - 2].Rows[i]);
                }
                intNowPage--;
            }
            this.DataSource = dtl;
        }
        public void ToFirst()
        {
            DataTable dtl = (DataTable)this.DataSource;
            if (this.DataSource == null)
            {
                return;
            }
            if (intNowPage == 1)
            {
                //MessageBox.Show("提示", "已经到第一页", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            else
            {
                dtl.Rows.Clear();
                for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
                {
                    dtl.ImportRow(ds.Tables[0].Rows[i]);
                }
                intNowPage = 1;
            }
            this.DataSource = dtl; 
        }
        public void ToLast()
        {
            DataTable dtl = (DataTable)this.DataSource;
            if (this.DataSource == null)
            {
                return;
            }
            if (intNowPage == intToltalPage)
            {
                ///MessageBox.Show("提示", "已经到最后一页", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            else
            {
                dtl.Rows.Clear();
                for (int i = 0; i < ds.Tables[intToltalPage - 1].Rows.Count; i++)
                {
                    dtl.ImportRow(ds.Tables[intToltalPage - 1].Rows[i]);
                }
                intNowPage = intToltalPage;
            }
            this.DataSource = dtl;
        }

        public enum BottomAlign { left, right, center }
        private BottomAlign _BottomAlignment = BottomAlign.left;
        /// <summary>
        /// 获取或设置统计结果显示位置
        /// </summary>
        [Category("Rax")]
        public BottomAlign BottomAlignment
        {
            get
            {
                return _BottomAlignment;
            }
            set
            {
                _BottomAlignment = value;
            }
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
            Graphics g;
            if (e == null)
            {
                g = Graphics.FromHwnd(this.Handle);
            }
            else
            {
                g = e.Graphics;
            }
            SolidBrush myBrush1 = new SolidBrush(SystemColors.Control);
            SolidBrush myBrush2 = new SolidBrush(Color.DarkGray);
            Pen pen1 = new Pen(Brushes.White, 1);
            if (this.Rows.Count > 0 && this.Rows[this.Rows.Count - 1].Displayed)
            {
                int LocY = this.GetRowDisplayRectangle(this.Rows.Count - 1, true).Location.Y + this.Rows[this.Rows.Count - 1].Height;
                //draw caption
                g.FillRectangle(myBrush1, 2, LocY, this.RowHeadersWidth - 2, 23);
                //caption's top line
                g.DrawLine(pen1, new Point(2, LocY), new Point(this.RowHeadersWidth - 1, LocY));
                // caption's left line
                g.DrawLine(pen1, new Point(2, LocY), new Point(2, LocY + 23));

                //draw cells
                StringFormat sf = new StringFormat();
                sf.Alignment = StringAlignment.Near;
                sf.LineAlignment = StringAlignment.Near;

                int cellLocX = this.RowHeadersWidth + 1;
                int i = this.Columns.Count;
                for (int j = 0; j < i; j++)
                {
                    if (this.Columns[j].Displayed)
                    {
                        int cellTextLocX = cellLocX;
                        g.FillRectangle(myBrush2, cellLocX, LocY, this.GetColumnDisplayRectangle(j, false).Width - 1, 23);
                        #region DrawString
                        if (this.GetColumnDisplayRectangle(j, false).Width == this.Columns[j].Width)
                        {
                            int cellWidth = this.GetColumnDisplayRectangle(j, false).Width;
                            try
                            {
                                Type type = this.Columns[j].ValueType;
                                string strFmValue = "";
                                decimal decValue = 0m;
                                if (type == typeof(decimal))
                                {
                                    for (int l = 0; l < this.Rows.Count; l++)
                                    {
                                        if (this.Rows[l].Cells[j].Value != null && !this.Rows[l].Cells[j].Value.ToString().Equals(""))
                                        {
                                            decValue += decimal.Parse(this.Rows[l].Cells[j].Value.ToString());
                                        }
                                    }

                                    //strFmValue = this.Columns[j].DataPropertyName + "列相关值";
                                    strFmValue = decValue.ToString();
                                }
                                switch (this.BottomAlignment)
                                {
                                    case BottomAlign.right:
                                        cellTextLocX = cellTextLocX + cellWidth - (int)g.MeasureString(strFmValue, new Font(new FontFamily("Verdana"), 8), cellWidth).Width;
                                        break;
                                    case BottomAlign.center:
                                        cellTextLocX = cellTextLocX + cellWidth / 2 - (int)(g.MeasureString(strFmValue, new Font(new FontFamily("Verdana"), 8), cellWidth).Width / 2);
                                        break;
                                }
                                g.DrawString(strFmValue, new Font(new FontFamily("Verdana"), 8), Brushes.Black, cellTextLocX, LocY + 6, sf);
                            }
                            catch
                            {
                                g.DrawString("", new Font(new FontFamily("Verdana"), 8), Brushes.Black, cellTextLocX, LocY + 6, sf);
                            }
                        }
                        #endregion
                        cellLocX += this.GetColumnDisplayRectangle(j, false).Width;
                    }
                }
                // draw caption string
                g.DrawString("合计", new Font(new FontFamily("Verdana"), 8), Brushes.Black, 4, LocY + 6, sf);
            }
        }
    }
}