導出Excel方法

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.OleDb;
using System.Windows.Forms;
using System.Data;
using System.Runtime.InteropServices;

namespace WmsClient
{
    public class Excel
    {
        public static void SaveAsExcel(DataTable dtExcel)
        {
            SaveFileDialog saveFileDialog = new SaveFileDialog();
            saveFileDialog.Filter = "导出Excel (*.xls)|*.xls";
            saveFileDialog.FilterIndex = 0;
            saveFileDialog.RestoreDirectory = true;
            saveFileDialog.CreatePrompt = true;
            saveFileDialog.Title = "导出文件保存路径";
            saveFileDialog.ShowDialog();
            string strName = saveFileDialog.FileName;
            if (strName.Length != 0)
            {
                //导出到execl  
                System.Reflection.Missing miss = System.Reflection.Missing.Value;
                Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();
                try
                {
                    excel.Application.Workbooks.Add(true);
                    excel.Visible = false;//若是true，则在导出的时候会显示EXcel界面。
                    if (excel == null)
                    {
                        MessageBox.Show("EXCEL无法启动！", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
                        return;
                    }
                    Microsoft.Office.Interop.Excel.Workbooks books = (Microsoft.Office.Interop.Excel.Workbooks)excel.Workbooks;
                    Microsoft.Office.Interop.Excel.Workbook book = (Microsoft.Office.Interop.Excel.Workbook)(books.Add(miss));
                    Microsoft.Office.Interop.Excel.Worksheet sheet = (Microsoft.Office.Interop.Excel.Worksheet)book.ActiveSheet;
                    sheet.Name = "test";

                    int m = 0, n = 0;
                    //生成列名称   这里i是从1开始的 因为我第0列是个隐藏列ID  没必要写进去
                    for (int i = 0; i < dtExcel.Columns.Count; i++)
                    {
                        excel.Cells[1, i + 1] = dtExcel.Columns[i].Caption.ToString();
                    }

                    //填充数据
                    for (int i = 0; i < dtExcel.Rows.Count; i++)
                    {
                        //j也是从1开始  原因如上  每个人需求不一样
                        for (int j = 0; j < dtExcel.Columns.Count; j++)
                        {
                            if (dtExcel.Rows[i][j].ToString().GetType() == typeof(string))
                            {
                                excel.Cells[i + 2, j + 1] = "‘" + dtExcel.Rows[i][j].ToString().Trim();
                            }
                            else
                            {
                                excel.Cells[i + 2, j + 1] = dtExcel.Rows[i][j].ToString().Trim();
                            }
                        }
                    }

                    sheet.SaveAs(strName, miss, miss, miss, miss, miss, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, miss, miss, miss);
                    book.Close(false, miss, miss);
                    books.Close();
                    excel.Quit();
                    System.Runtime.InteropServices.Marshal.ReleaseComObject(sheet);
                    System.Runtime.InteropServices.Marshal.ReleaseComObject(book);
                    System.Runtime.InteropServices.Marshal.ReleaseComObject(books);
                    System.Runtime.InteropServices.Marshal.ReleaseComObject(excel);

                    GC.Collect();
                    MessageBox.Show("数据已经成功导出!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    //toolStripProgressBar1.Value = 0;
                    System.Diagnostics.Process.Start(strName);
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message, "错误提示");
                }
                finally
                {
                    KillSpecialExcel(excel);
                }
            }
        }

        private static void KillSpecialExcel(Microsoft.Office.Interop.Excel.Application m_objExcel)
        {
            try
            {
                if (m_objExcel != null)
                {
                    int lpdwProcessId;
                    GetWindowThreadProcessId(new IntPtr(m_objExcel.Hwnd), out lpdwProcessId);
                    System.Diagnostics.Process.GetProcessById(lpdwProcessId).Kill();
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("Delete Excel Process Error:" + ex.Message);
            }
        }

        [DllImport("User32.dll", CharSet = CharSet.Auto)]
        static extern int GetWindowThreadProcessId(IntPtr hWnd, out int lpdwProcessId);

    }
}