C#实现多Excel多Sheet合并

int modelSheetHeadRows = 1;
                    Excel.Application excel = null;
                    try
                    {
                        excel = new Excel.Application();
                        string newModel = tbModel.Text.Replace(".", "合并.");
                        excel.Visible = true;
                        File.Copy(tbModel.Text, newModel, true);
                        Excel.Workbook modelWorkBook = excel.Workbooks.Open(newModel, 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);


                        for (int i = 0; i < listViewSel.Items.Count; i++)
                        {
                            string pathName = listViewSel.Items[i].SubItems[2].Text + "\\" + listViewSel.Items[i].SubItems[1].Text;

                            Excel.Workbook tmpWorkBook = excel.Workbooks.Open(pathName, 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);


                            for (int j = 1; j <= tmpWorkBook.Sheets.Count; j++)
                            {
                                Excel.Worksheet tmpSheet = (Excel.Worksheet)tmpWorkBook.Sheets[j];
                                if (modelWorkBook.Sheets.Count < j)
                                {
                                    modelWorkBook.Sheets.Add(Missing.Value);
                                }
                                Excel.Worksheet modelSheet = (Excel.Worksheet)modelWorkBook.Sheets[j];
                                if (i == 0)
                                {
                                    modelSheetHeadRows = modelSheet.UsedRange.Cells.Rows.Count;
                                }
                                int tmpSheetRows = tmpSheet.UsedRange.Cells.Rows.Count;
                                int tmpSheetColumns = tmpSheet.UsedRange.Cells.Columns.Count;
                                int modelSheetRows = modelSheet.UsedRange.Cells.Rows.Count;

                                tmpSheet.get_Range((Excel.Range)tmpSheet.Cells[modelSheetHeadRows + 1, 1], (Excel.Range)tmpSheet.Cells[tmpSheetRows, tmpSheetColumns]).Copy(
                                    modelSheet.get_Range((Excel.Range)modelSheet.Cells[modelSheetRows + 1, 1], (Excel.Range)modelSheet.Cells[tmpSheetRows + modelSheetRows - 1, tmpSheetColumns]));
                            }
                            tmpWorkBook.Close();
                            modelWorkBook.Save();
                        }
                        modelWorkBook.Close();
                    }
                    catch (Exception ee)
                    {
                        MessageBox.Show("[错误]：" + ee.Message, "信息提示");
                    }
                    finally
                    {
                        pathtb.Text = null;
                        tbModel.Text = null;
                        listView.Items.Clear();
                        listViewSel.Items.Clear();
                        excel.Quit();
                        MessageBox.Show("合并完成");
                    }