using Microsoft.Office.Interop.Excel;//转换为excel时，需要引用此命名空间

using ET;//转换为wps时，需要引用此命名空间
using KSO;//转换为wps时，需要引用此命名空间
当转换为excel时，需要引入Microsoft.Office.Interop.Excel.dll;当转换为wps时，需要引入Interop.ET.dll，Interop.KSO.dll;

#region 查询注册表,判断本机是否安装office2003,2007和wps
        public int ExistsRegedit()
        {
            int ifused = 0;
            RegistryKey rk = Registry.LocalMachine;
            RegistryKey akey = rk.OpenSubKey(@"SOFTWARE\Microsoft\Office\11.0\Excel\InstallRoot\");//查询2003

　　　　RegistryKey akey07 = rk.OpenSubKey(@"SOFTWARE\Microsoft\Office\12.0\Excel\InstallRoot\");//查询2007
            RegistryKey akeytwo = rk.OpenSubKey(@"SOFTWARE\Kingsoft\Office\6.0\common\");//查询wps
            //检查本机是否安装Office2003
            if (akey != null)
            {
                string file03 = akey.GetValue("Path").ToString();
                if (File.Exists(file03 + "Excel.exe"))
                {
                    ifused += 1;
                }
            }

　　　　　//检查本机是否安装Office2007

if (akey07 != null)
            {
                string file07 = akey.GetValue("Path").ToString();
                if (File.Exists(file07 + "Excel.exe"))
                {
                    ifused += 2;
                }
            }
            //检查本机是否安装wps
            if (akeytwo != null)
            {
                string filewps = akeytwo.GetValue("InstallRoot").ToString();
                if (File.Exists(filewps + @"\office6\et.exe"))
                {
                    ifused += 4;
                }
            }
            return ifused;
        }
        #endregion

#region 将DBF文件放入DataSet
        private DataSet DbfToDs(string my_TablePath, string my_TableName)
        {
            //数据库连接定义
            OleDbConnection my_conn; //数据连接
            OleDbDataAdapter my_Adapter;//数据适配器
            DataSet my_Ds = null;
            ////数据库连接
            try
            {
                string path = my_TablePath.Substring(0, my_TablePath.LastIndexOf("\\")) + "\\";
                string connString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + path + ";Extended Properties=dBASE IV;Persist Security Info=False;";
                string my_StrSelect = "SELECT * FROM " + my_TableName;
                my_conn = new OleDbConnection(connString);
                my_Adapter = new OleDbDataAdapter(my_StrSelect, my_conn);
                my_Ds = new DataSet();

//填充数据集
                my_Adapter.Fill(my_Ds, my_TableName);
            }
            catch (Exception ex)
            {
                MessageBox.Show("选择文件格式不正确，请选择.dbf文件！", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }

return my_Ds;
        }
        #endregions

#region 把数据文件导入到.xls文件
        public void ExportToExcel(DataSet ds)
        {
            if (ds.Tables.Count != 0)
            {
                //创建excel文件
                Microsoft.Office.Interop.Excel.Application myExcel = new Microsoft.Office.Interop.Excel.ApplicationClass();

//打开已有的文件
                Microsoft.Office.Interop.Excel.Workbook xBook = myExcel.Workbooks._Open(txtPath.Text , Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value);
                //指定要操作的sheet
                Microsoft.Office.Interop.Excel.Worksheet xSheet = (Microsoft.Office.Interop.Excel.Worksheet)xBook.Sheets[1];

#region 改成中文列名
                xSheet.Cells[1, 1] = "程序员";

.

　　　　　　.

　　　　　　.
//改成中文列名时，可将中文列名放入string[]中，然后循环此数组，将第一行改成相应的中文列名
                #endregion

xBook.SaveAs(txtPath.Text, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value);

myExcel.Visible = true;

}
            else
            {
                System.Windows.Forms.MessageBox.Show("No Data");
            }
        }
        #endregion

#region 把数据文件导出为wps
        public void ExportToWps(DataSet ds)
        {
            if (ds.Tables.Count > 0)
            {
                eTApp = new ET.Application();
                eTApp.Visible = false;
                eTWorkBook = eTApp.Workbooks.Open(txtPath.Text, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value);

eTWorkSheet = (ET.Worksheet)eTWorkBook.Worksheets[1];

#region 改成中文列名
                eTWorkBook.ActiveSheet.Cells.set_Item(1, 1, "程序员")

#endregion

eTWorkBook.SaveAs(txtPath.Text, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, ETSaveAsAccessMode.etNoChange, Missing.Value, Missing.Value, Missing.Value, Missing.Value);

eTApp.Visible = true;

}

}

#endregion

当转换成xls或者wps时，一般都是循环dataset然后将数据写入每一个单元格,但是当数据量大时转换速度会很慢；所以将数据放入dataset后，可以使用file.copy(文件1,文件2);这样速度会快很多；