C#.NET 处理EXECL

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Reflection;
using System.Windows.Forms;

namespace PAL_MES.BRLibrary
{
    class CDealExcel
    {
        public void ExportToExcel(DataTable dt)
        {
            Excel.Application xlApp = new Excel.Application();
            Excel.Workbook xlBook = xlApp.Application.Workbooks.Add(true);
            Excel.Worksheet xlSheet = (Excel.Worksheet)xlBook.ActiveSheet;
            xlSheet.Name = "Result";
            Excel.Range ra;
            xlApp.Visible = true;
            xlApp.UserControl = false;
            xlApp.DisplayAlerts = false;

            int iRow = dt.Rows.Count;
            int iCol = dt.Columns.Count;

            string[,] x = new string[iRow, 1];
            int i = 1;
            foreach (DataColumn dc in dt.Columns)
            {
                xlSheet.Cells[1, i] = dt.Columns[i - 1].Caption.ToString();

                int j = 0;
                foreach (DataRow dr in dt.Rows)
                {
                    x[j, 0] = dr[i - 1].ToString();
                    j = j + 1;
                }
                ra = xlSheet.get_Range(xlSheet.Cells[2, i], xlSheet.Cells[iRow + 1, i]);
                ra.Value2 = x;
                ra.EntireColumn.AutoFit();
                i = i + 1;
            }
            ra = xlSheet.get_Range(xlSheet.Cells[1, 1], xlSheet.Cells[dt.Rows.Count + 1, dt.Columns.Count]);
            ra.Borders.LineStyle = Excel.XlLineStyle.xlContinuous;
            ra.Font.Name = "Arial";
            ra.Font.Size = 10;
            ra = xlSheet.get_Range(xlSheet.Cells[1, 1], xlSheet.Cells[1, dt.Columns.Count]);
            ra.Interior.ColorIndex = 45;
            ra.HorizontalAlignment = Excel.XlHAlign.xlHAlignCenter;

            xlSheet = null;
            xlBook = null;
            xlApp = null;
            GC.Collect();  
        }

        public DataTable GetSheetFromExcel(string FileName)
        {
            Missing Miss = Missing.Value;
            DataTable dtSheet = new DataTable();
            Excel.Application xlApp = new Excel.Application();
            Excel.Workbook xlBook = xlApp.Workbooks.Open(FileName, Miss, Miss, Miss, Miss, Miss, Miss, Miss, Miss, Miss, Miss, Miss, Miss, Miss, Miss);
            dtSheet.Columns.Add("SheetName");
            for (int i = 1; i <= xlBook.Sheets.Count; i++)
            {
                dtSheet.Rows.Add(((Excel.Worksheet)xlBook.Worksheets[i]).Name.ToString());
            }

            xlApp.Quit();
            xlBook = null;
            xlApp = null;
            return dtSheet;

        }

    }
}

   调用语句：CExcel.ExportToExcel(dt);      CExcel 类名。