cxiはExcelを利用して直接データをDataGred Viewに読みます。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using Microsoft.Office.Core;
using Excel=Microsoft.Office.Interop.Excel;
using System.Windows.Forms;
using System.Reflection;

 
namespace Excelproject
{
    public partial class ExcelForm : Form
    {

        private ExcelOperate eo;
        private string excelpath;
        private Excel.Application excel1;
        private Excel.Workbooks wbs = null;
        private Excel.Workbook wb = null;
        private Excel.Sheets  wss;
        private Excel.Worksheet ws = null;
        private Excel.Range range1 = null;

 
        public ExcelForm()
        {
            InitializeComponent();
            this.excel1 = new Excel.Application();
            if (excel1 == null)
            {
                MessageBox.Show("error");
                System.Windows.Forms.Application.Exit();
            }
            excel1.Visible = true;

        }

 

        #region excel        
        private void   _Click(object sender, EventArgs e)
        {
            openFileDialog1 = new OpenFileDialog();
            openFileDialog1.Title = "  excel  ";
            openFileDialog1.Filter = "excel03  (*.xls)|*.xls|excel07  (*.xlsx)|*.xlsx";
            openFileDialog1.InitialDirectory = @"C:\Users\Administrator\Desktop";
            openFileDialog1.RestoreDirectory = true;
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                //            
                excelpath = openFileDialog1.FileName;
                eo = new ExcelOperate();
                readExcel(excelpath);

            }
        }

        void readExcel(string path)
        {
            object miss = System.Reflection.Missing.Value; 
            excel1.UserControl = true;
            excel1.DisplayAlerts = false;
            excel1.Application.Workbooks.Open(excelpath, miss, miss, miss, miss,
                                             miss, miss, miss, miss,
                                             miss, miss, miss, miss,
                                             miss, miss);
            wbs = excel1.Workbooks;
            wss = wbs[1].Worksheets;
            ws = (Excel.Worksheet) wss.get_Item(1);
            int rowNum = ws.UsedRange.Cells.Rows.Count;
            int colNum = ws.UsedRange.Cells.Columns.Count;
            string cellStr = null;
            char ch = 'A';
            for (int i = 0; i < colNum; i++)
            {
                dataGridView1.Columns.Add(i.ToString(), ch.ToString());
                dataGridView1.Rows.Add(rowNum);
                for (int j = 0; j <rowNum; j++)
                {
                    cellStr = ch.ToString() + (j + 1).ToString();
                    dataGridView1[i, j].Value = ws.UsedRange.Cells.get_Range(cellStr, miss).Text.ToString();
                }
                ch++;
            }

 
        }

        #endregion

    }
}