用NPOI从DataBase到Excel '2

NPOI的C# Helper代码2

         public static MemoryStream ExportXls(DataTable dt)
         {
             HSSFWorkbook wk = new HSSFWorkbook();
             ISheet sheet = null;

             string sheetName = "Sheet1";
             if (!string.IsNullOrEmpty(dt.TableName))
             {
                 sheetName = dt.TableName;
             }
             sheet = wk.CreateSheet(sheetName);
             //列头及样式
             IRow headerRow = sheet.CreateRow();
             ICellStyle headStyle = wk.CreateCellStyle();
             headStyle.Alignment = HorizontalAlignment.Center;

             IFont font = wk.CreateFont();
             font.FontHeightInPoints = ;
             font.Boldweight = ;
             font.FontName = "微雅黑体";
             headStyle.SetFont(font);

             foreach (DataColumn column in dt.Columns)  //column共属性
             {
                 headerRow.CreateCell(column.Ordinal).SetCellValue(column.Caption); //clomun.ColumnName
                 headerRow.GetCell(column.Ordinal).CellStyle = headStyle;  //体会
             }

             int rowIndex = ;
             foreach (DataRow row in dt.Rows)
             {
                 //HSSFRow dataRow = (HSSFRow)sheet.CreateRow(rowIndex); //也可以这样写
                 IRow dataRow = sheet.CreateRow(rowIndex);
                 foreach (DataColumn column in dt.Columns)
                 {
                     dataRow.CreateCell(column.Ordinal).SetCellValue(row[column].ToString());
                 }
                 rowIndex++;
             }
             MemoryStream ms = new MemoryStream();
             wk.Write(ms);
             ms.Flush();
             return ms;
         }

         //输出
         public static void SaveToFile(MemoryStream ms)
         {
             using (FileStream fs = File.OpenWrite(@"c:\1.xls"))
             {
                 byte[] data = ms.ToArray();
                 fs.Write(data,,data.Length);
                 fs.Flush();
                 data = null;
             }
         }
         public static void SaveToFile(MemoryStream ms, string filePath)
         {
             using (FileStream fs = new FileStream(filePath, FileMode.Create, FileAccess.Write))
             {
                 byte[] data = ms.ToArray();
                 fs.Write(data,,data.Length);
                 fs.Flush();
                 data = null;
             }
         }