C# 操作Excel进程与获取Excel表格数据

     最近做了一下Excel相关的程序，学到了不少东西，在此感谢博客园中无私奉献的园友们。很多资料和信息都是从博客园获取的！

1、完美关闭Excel进程

思路：只把EXCEL进程kill是不够的，还必须把全局变量中的所有与Excel操作相关的excel变量赋值为null才可以！

代码如下：

private void QuitExcelApp()
{
   if (excelApp != null)//excelApp全局变量
            {
                //关闭EXCEl进程，只把EXCEL进程kill是不够的，
                //还必须把全局变量中的所有与Excel操作相关的excel变量
                //赋值为null才可以
                excelApp.DisplayAlerts = false;//不显示提示框
                excelApp.Workbooks.Close();
                excelApp.Quit();
                KillSpecialExcel(excelApp);
                excelApp = null;
                workbook1 = null;
                workSheetTemp = null;
            }
}
[DllImport("user32.dll", SetLastError = true)]
        static extern int GetWindowThreadProcessId(IntPtr hWnd, out int lpdwProcessId);

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

2、获取Excel表单数

try
            {
                if (tempListBox.Items.Count != 0)//清空原有显示的表单
                {
                    tempListBox.Items.Clear();
                }
                foreach (Worksheet wsheet in workbook1.Worksheets)
                {
                    tempListBox.Items.Add(wsheet.Name);
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString(), "信息提示");
            }

3、打开Excel工作簿

 excelApp = new Microsoft.Office.Interop.Excel.Application();

                excelApp.DisplayAlerts = false;//不显示提示框
                workbook1 = excelApp.Workbooks.Open(strFileName, Type.Missing, Type.Missing, Type.Missing,
                        Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing,
                        Type.Missing, Type.Missing, Type.Missing, Type.Missing);

4、获取Excel中的表格，注意当Excel和C#自带的链接数据库获取表结合使用时，一定要先关闭Excel进程，再链接！

 private void OpenExcelTabelByName(string tabelName)
        {
            try
            {
                string ss = tabelName;
                //关闭Excel进程
                QuitAndOpenExcelApp();
                string connStr = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + strFileName+ ";Extended Properties='Excel 8.0;HDR=YES; IMEX=1'";
                OleDbConnection con = new OleDbConnection(connStr);
                con.Open();

                string strsql = "select * from [" + ss + "$]";

                OleDbDataAdapter oda = new OleDbDataAdapter(strsql, con);
                DataSet ds = new DataSet();
                oda.Fill(ds);
                daGridViewTem.DataSource = ds.Tables[0];
                for (int i = 0; i < daGridViewTem.Columns.Count; i++)
                {
                    daGridViewTem.Columns[i].SortMode = DataGridViewColumnSortMode.NotSortable;
                }
                oda.Dispose();
                con.Close();
                //重新新建Excel进程
                QuitAndOpenExcelApp();
                workSheetTemp = (Worksheet)workbook1.Worksheets[ss];
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "获取Excel文件失败");
                return;
            }
        }