第二种方法:引用Excel组件，先定义Excel对象(实例)，再根据DataGridView中数据，一格一格去填充Excel对象(实例)，单元格，后保存Excel对象(实例)[调用对象Save()方法].

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 2      /// <summary>
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 4        /// 另存新档按钮   导出成Excel
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 6        /// </summary>
 7
 8        private void SaveToExcel() //另存新档按钮   导出成Excel
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10        {
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12            SaveFileDialog saveFileDialog = new SaveFileDialog();
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14            saveFileDialog.Filter = "Execl files (*.xls)|*.xls";
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16            saveFileDialog.FilterIndex = 0;
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18            saveFileDialog.RestoreDirectory = true;
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20            saveFileDialog.CreatePrompt = true;
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22            saveFileDialog.Title = "Export Excel File To";
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24
25            saveFileDialog.ShowDialog();
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27            string strName = saveFileDialog.FileName;
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29
30
31            System.Reflection.Missing miss = System.Reflection.Missing.Value;  
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33
34            Excel.Application excel = new Excel.ApplicationClass();
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36            Excel.Workbooks books = (Excel.Workbooks)excel.Workbooks;
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38            Excel.Workbook book = (Excel.Workbook)(books.Add(miss));
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40            Excel.Worksheet sheet = (Excel.Worksheet)book.ActiveSheet;
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42            sheet.Name = "test";
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44
45            int colIndex=0;
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47            foreach (DataGridViewColumn column in dgvAgeWeekSex.Columns)
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49            {
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51                colIndex++;
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53                excel.Cells[1， colIndex] = column.HeaderText;
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55            }
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57
58            for (int i = 0; i < dgvAgeWeekSex.Rows.Count; i++)
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60            {
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62                for (int j = 0; j < dgvAgeWeekSex.Columns.Count; j++)
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64                {
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66                    excel.Cells[i + 2， j + 1] = dgvAgeWeekSex.Rows[i].Cells[j].Value.ToString();
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68                }
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70            }
71
72        
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74            sheet.SaveAs(strName， miss， miss， miss， miss， miss， Excel.XlSaveAsAccessMode.xlNoChange， miss， miss);        
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76           
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78            book.Close(false， miss， miss);
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80            books.Close();
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82            excel.Quit();
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84
85            //System.Runtime.InteropServices.Marshal.ReleaseComObject();  
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87            System.Runtime.InteropServices.Marshal.ReleaseComObject(sheet);
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89            System.Runtime.InteropServices.Marshal.ReleaseComObject(book);
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91            System.Runtime.InteropServices.Marshal.ReleaseComObject(books);
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93            System.Runtime.InteropServices.Marshal.ReleaseComObject(excel);
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95            GC.Collect();
96
97        }
98