DataTable导入到Excel文件

    public static bool DataTableToExcel(System.Data.DataTable dt, string fileName, bool showFileDialog=false)
        {
            if (showFileDialog)
            {
                SaveFileDialog saveFileDialog = new SaveFileDialog();
                saveFileDialog.Filter = "Execl files (*.xls)|*.xls";
                saveFileDialog.FilterIndex = 0;
                saveFileDialog.RestoreDirectory = true;
                saveFileDialog.CreatePrompt = true;
                saveFileDialog.FileName = fileName;
                saveFileDialog.Title = "Export Excel File To";
                // saveFileDialog.ShowDialog();

                if (saveFileDialog.ShowDialog() == DialogResult.OK)
                    fileName = saveFileDialog.FileName;
                else
                    return false;
            }
            System.Reflection.Missing miss = System.Reflection.Missing.Value;
            Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.ApplicationClass();
            Microsoft.Office.Interop.Excel.Workbooks books = (Microsoft.Office.Interop.Excel.Workbooks)excel.Workbooks;
            Microsoft.Office.Interop.Excel.Workbook book = (Microsoft.Office.Interop.Excel.Workbook)(books.Add(miss));
            Microsoft.Office.Interop.Excel.Worksheet sheet = (Microsoft.Office.Interop.Excel.Worksheet)book.ActiveSheet;
            if (!string.IsNullOrEmpty(dt.TableName))
            {
                sheet.Name = dt.TableName;
            }

            int intIndex = 0;
            foreach (DataColumn column in dt.Columns)
            {
                intIndex++;
                excel.Cells[1, intIndex] = column.ColumnName;
            }

            int rowCount = dt.Rows.Count;
            int colCount = dt.Columns.Count;
            object[,] dataArray = new object[rowCount, colCount];
            for (int i = 0; i < rowCount; i++)
            {
                for (int j = 0; j < colCount; j++)
                {
                    //避免格式不兼容，加上"'"
                    dataArray[i, j] = "'"+dt.Rows[i][j].ToString();
                }
            }

            sheet.get_Range("A2", sheet.Cells[rowCount + 1, colCount]).Value2 = dataArray;
            sheet.SaveAs(fileName, miss, miss, miss, miss, miss, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, miss, miss, miss);

            book.Close(false, miss, miss);
            books.Close();
            excel.Quit();

            //System.Runtime.InteropServices.Marshal.ReleaseComObject();   
            System.Runtime.InteropServices.Marshal.ReleaseComObject(sheet);
            System.Runtime.InteropServices.Marshal.ReleaseComObject(book);
            System.Runtime.InteropServices.Marshal.ReleaseComObject(books);
            System.Runtime.InteropServices.Marshal.ReleaseComObject(excel);
            GC.Collect();
            return true;


        }