C# DataSet 导出 导入 Excel

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Windows.Forms;
using Microsoft.Office.Interop.Excel;
using System.Reflection;

namespace exceltest
{
    public class ImportExportToExcel
    {
        private string strConn;

        private System.Windows.Forms.OpenFileDialog openFileDlg = new System.Windows.Forms.OpenFileDialog();
        private System.Windows.Forms.SaveFileDialog saveFileDlg = new System.Windows.Forms.SaveFileDialog();

        public ImportExportToExcel()
        {
            //
            // TODO: 在此处添加构造函数逻辑
            //
            this.openFileDlg.DefaultExt = "xls";
            this.openFileDlg.Filter = "Excel文件 (*.xls)|*.xls";

            this.saveFileDlg.DefaultExt = "xls";
            this.saveFileDlg.Filter = "Excel文件 (*.xls)|*.xls";

        }

        //从Excel文件导入到DataSet
        #region 从Excel文件导入到DataSet
        //        /// <summary>
        //        /// 从Excel导入文件
        //        /// </summary>
        //        /// <param name="strExcelFileName">Excel文件名</param>
        //        /// <returns>返回DataSet</returns>
        //        public DataSet ImportFromExcel(string strExcelFileName)
        //        {
        //            return doImport(strExcelFileName);
        //        }
        /**/
        /// <summary>
        /// 从选择的Excel文件导入
        /// </summary>
        /// <returns>DataSet</returns>
        public DataSet ImportFromExcel()
        {
            DataSet ds = new DataSet();
            if (openFileDlg.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                ds = doImport(openFileDlg.FileName);
            return ds;
        }
        /// <summary>
        /// 从指定的Excel文件导入
        /// </summary>
        /// <param name="strFileName">Excel文件名</param>
        /// <returns></returns>
        public DataSet ImportFromExcel(string strFileName)
        {
            DataSet ds = new DataSet();
            ds = doImport(strFileName);
            return ds;
        }
        /// <summary>
        /// 执行导入
        /// </summary>
        /// <param name="strFileName">文件名</param>
        /// <returns>DataSet</returns>
        private DataSet doImport(string strFileName)
        {
            if (strFileName == "") return null;

            strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" +
                "Data Source=" + strFileName + ";" +
                "Extended Properties=Excel 8.0;";
            OleDbDataAdapter ExcelDA = new OleDbDataAdapter("SELECT * FROM [Sheet1$]", strConn);

            DataSet ExcelDs = new DataSet();
            try
            {
                ExcelDA.Fill(ExcelDs, "ExcelInfo");

            }
            catch (Exception err)
            {
                System.Console.WriteLine(err.ToString());
            }
            return ExcelDs;

        }
        #endregion

        //从DataSet到出到Excel
        #region 从DataSet到出到Excel
        /// <summary>
        /// 导出指定的Excel文件
        /// </summary>
        /// <param name="ds">要导出的DataSet</param>
        /// <param name="strExcelFileName">要导出的Excel文件名</param>
        public void ExportToExcel(DataSet ds, string strExcelFileName)
        {
            if (ds.Tables.Count == 0 || strExcelFileName == "") return;
            doExport(ds, strExcelFileName);


        }
        /// <summary>
        /// 导出用户选择的Excel文件
        /// </summary>
        /// <param name="ds">DataSet</param>
        public void ExportToExcel(DataSet ds)
        {
            if (saveFileDlg.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                doExport(ds, saveFileDlg.FileName);

        }
        /// <summary>
        /// 执行导出
        /// </summary>
        /// <param name="ds">要导出的DataSet</param>
        /// <param name="strExcelFileName">要导出的文件名</param>
        private void doExport(DataSet ds, string strExcelFileName)
        {
            Application excel = new Application();

            //            Excel.Workbook obj=new Excel.WorkbookClass();
            //            obj.SaveAs("c:\zn.xls",Excel.XlFileFormat.xlExcel9795,null,null,false,false,Excel.XlSaveAsAccessMode.xlNoChange,null,null,null,null);

            int rowIndex = 1;
            int colIndex = 0;

            excel.Application.Workbooks.Add(true);

            DataTable table = ds.Tables[0];
            foreach (DataColumn col in table.Columns)
            {
                colIndex++;
                excel.Cells[1, colIndex] = col.ColumnName;
            }

            foreach (DataRow row in table.Rows)
            {
                rowIndex++;
                colIndex = 0;
                foreach (DataColumn col in table.Columns)
                {
                    colIndex++;
                    excel.Cells[rowIndex, colIndex] = row[col.ColumnName].ToString();
                }
            }
            excel.Visible = false;
            excel.Sheets[0] = "sss";
            excel.ActiveWorkbook.SaveAs(strExcelFileName + ".XLS", Excel.XlFileFormat.xlExcel9795, null, null, false, false, Excel.XlSaveAsAccessMode.xlNoChange, null, null, null, null);
            //wkbNew.SaveAs strBookName

            //excel.Save(strExcelFileName);
            excel.Quit();
            excel = null;

            GC.Collect();//垃圾回收
        }
        #endregion

        //从XML导入到Dataset
        #region 从XML导入到Dataset

        /// <summary>
        /// 从选择的XML文件导入
        /// </summary>
        /// <returns>DataSet</returns>
        public DataSet ImportFromXML()
        {
            DataSet ds = new DataSet();
            System.Windows.Forms.OpenFileDialog openFileDlg = new System.Windows.Forms.OpenFileDialog();
            openFileDlg.DefaultExt = "xml";
            openFileDlg.Filter = "xml文件 (*.xml)|*.xml";
            if (openFileDlg.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                try { ds.ReadXml(openFileDlg.FileName, System.Data.XmlReadMode.ReadSchema); }
                catch { }
            return ds;
        }
        /// <summary>
        /// 从指定的XML文件导入
        /// </summary>
        /// <param name="strFileName">XML文件名</param>
        /// <returns></returns>
        public DataSet ImportFromXML(string strFileName)
        {
            if (strFileName == "")
                return null;
            DataSet ds = new DataSet();
            try { ds.ReadXml(strFileName, System.Data.XmlReadMode.ReadSchema); }
            catch { }
            return ds;
        }
        #endregion

        //从DataSet导出到XML
        #region 从DataSet导出到XML
        /// <summary>
        /// 导出指定的XML文件
        /// </summary>
        /// <param name="ds">要导出的DataSet</param>
        /// <param name="strXMLFileName">要导出的XML文件名</param>
        public void ExportToXML(DataSet ds, string strXMLFileName)
        {
            if (ds.Tables.Count == 0 || strXMLFileName == "") return;
            doExportXML(ds, strXMLFileName);
        }         /// <summary>
        /// 导出用户选择的XML文件
        /// </summary>
        /// <param name="ds">DataSet</param>
        public void ExportToXML(DataSet ds)
        {
            System.Windows.Forms.SaveFileDialog saveFileDlg = new System.Windows.Forms.SaveFileDialog();
            saveFileDlg.DefaultExt = "xml";
            saveFileDlg.Filter = "xml文件 (*.xml)|*.xml";
            if (saveFileDlg.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                doExportXML(ds, saveFileDlg.FileName);
        }

        /// <summary>
        /// 执行导出
        /// </summary>
        /// <param name="ds">要导出的DataSet</param>
        /// <param name="strExcelFileName">要导出的XML文件名</param>
        private void doExportXML(DataSet ds, string strXMLFileName)
        {
            try
            { ds.WriteXml(strXMLFileName, System.Data.XmlWriteMode.WriteSchema); }
            catch (Exception ex)
            { System.Windows.Forms.MessageBox.Show(ex.Message, "Errol"); }
        }

        #endregion

          #region "强制结束Word进程(垃圾回收)"
        /// <summary> 
        /// 强制结束Word进程(垃圾回收) 
        /// </summary> 
        public void KillWordProcess()
        {
            int ProceedingCount = 0;
            try
            {
                System.Diagnostics.Process[] ProceddingCon = System.Diagnostics.Process.GetProcesses();
                foreach (System.Diagnostics.Process IsProcedding in ProceddingCon)
                {
                    if (IsProcedding.ProcessName.ToUpper() == "WINWORD")
                    {
                        ProceedingCount += 1;
                        IsProcedding.Kill();
                    }
                }
            }
            catch (System.Exception err)
            {
                MessageBox.Show(err.Message + "\r" + "(" + err.Source + ")" + "\r" + err.StackTrace);
            }
        }
        #endregion
    }
}