/// <summary>
/// DataTable导出到Excel的MemoryStream
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表头文本</param>
public static MemoryStream DataTableToExcel1(DataTable dtSource, string strHeaderText)
{
Helper helper = new Helper("Data Source=172.128.2.1/veims;User ID=zte;Password=zsfyqch;");
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = (HSSFSheet)workbook.CreateSheet();
#region 右击文件 属性信息
{
DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
dsi.Company = "NPOI";
workbook.DocumentSummaryInformation = dsi;
SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
si.Author = "文件作者信息"; //填加xls文件作者信息
si.ApplicationName = "创建程序信息"; //填加xls文件创建程序信息
si.LastAuthor = "最后保存者信息"; //填加xls文件最后保存者信息
si.Comments = "作者信息"; //填加xls文件作者信息
si.Title = "标题信息"; //填加xls文件标题信息
si.Subject = "主题信息"; //填加文件主题信息
si.CreateDateTime = System.DateTime.Now;
workbook.SummaryInformation = si;
}
#endregion
HSSFCellStyle dateStyle = (HSSFCellStyle)workbook.CreateCellStyle();
HSSFDataFormat format = (HSSFDataFormat)workbook.CreateDataFormat();
dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");
//取得列宽
int[] arrColWidth = new int[dtSource.Columns.Count];
foreach (DataColumn item in dtSource.Columns)
{
arrColWidth[item.Ordinal] = Encoding.GetEncoding(936).GetBytes(item.ColumnName.ToString()).Length;
}
for (int i = 0; i < dtSource.Rows.Count; i++)
{
for (int j = 0; j < dtSource.Columns.Count; j++)
{
int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length;
if (intTemp > arrColWidth[j])
{
arrColWidth[j] = intTemp;
}
}
}
int rowIndex = 0;
foreach (DataRow row in dtSource.Rows)
{
#region 新建表，填充表头，填充列头，样式
if (rowIndex == 65535 || rowIndex == 0)
{
if (rowIndex != 0)
{
sheet = (HSSFSheet)workbook.CreateSheet();
}
#region 表头及样式
{
HSSFRow headerRow = (HSSFRow)sheet.CreateRow(0);
headerRow.HeightInPoints = 25;
headerRow.CreateCell(0).SetCellValue(strHeaderText);
HSSFCellStyle headStyle = (HSSFCellStyle)workbook.CreateCellStyle();
// headStyle.Alignment = CellHorizontalAlignment.CENTER;
HSSFFont font = (HSSFFont)workbook.CreateFont();
font.FontHeightInPoints = 20;
font.Boldweight = 700;
headStyle.SetFont(font);
headerRow.GetCell(0).CellStyle = headStyle;
// sheet.AddMergedRegion(new Region(0, 0, 0, dtSource.Columns.Count - 1));
//headerRow.Dispose();
}
#endregion
#region 列头及样式
{
HSSFRow headerRow = (HSSFRow)sheet.CreateRow(1);
HSSFCellStyle headStyle = (HSSFCellStyle)workbook.CreateCellStyle();
//headStyle.Alignment = CellHorizontalAlignment.CENTER;
HSSFFont font = (HSSFFont)workbook.CreateFont();
font.FontHeightInPoints = 10;
font.Boldweight = 700;
headStyle.SetFont(font);
foreach (DataColumn column in dtSource.Columns)
{
headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
headerRow.GetCell(column.Ordinal).CellStyle = headStyle;
//设置列宽
sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);
}
// headerRow.Dispose();
}
#endregion
rowIndex = 2;
}
#endregion
#region 填充内容
HSSFRow dataRow = (HSSFRow)sheet.CreateRow(rowIndex);
string dtname = row[1].ToString();
#region
string sql = string.Format(@"select cc.COMMENTS, cC.COLUMN_NAME,
CASE WHEN c.data_type='VARCHAR2' THEN '字符串型C'
WHEN c.data_type='NUMBER' THEN '数值型N'
WHEN c.data_type='CHAR' THEN '字符串型C'
WHEN c.data_type='DATE' THEN '日期时间型T'
WHEN c.data_type='FLOAT' THEN '数值型N'
WHEN c.data_type='CLOB' THEN '长文本text'
WHEN c.data_type='NCHAR' THEN '字符串型C'
WHEN c.data_type='RAW' THEN '字符串型C'
WHEN c.data_type='NVARCHAR2' THEN '字符串型C' END data_type
,
c.data_length
,'无条件共享' A1,
'用户数据校核、业务协同及大数据应用' A2,'共享平台方式'A3,'数据库'A4,'否'A5
from user_tab_columns c
LEFT JOIN
user_col_comments cc
ON cc.COLUMN_NAME=c.COLUMN_NAME AND CC.Table_Name='{0}'
where
c.Table_Name='{0}' order by c.COLUMN_NAME asc", dtname.ToUpper());
#endregion
DataTable dd = helper.ExecuteDataSet(sql).Tables[0];
int kk = 0;//列控制 0到16列、27、28列 全部合并单元格
foreach (DataColumn column in dtSource.Columns)
{
//第一列合并第三行到第五行 0 1 2 3 4
//sheet.AddMergedRegion(new CellRangeAddress(2, 4, 0, 0));
if (dd.Rows.Count > 0 && kk < 17)
{
// 0到16列全部合并单元格
// 第KK列合并第2行到第dd.Rows.Count行
sheet.AddMergedRegion(new CellRangeAddress(rowIndex, rowIndex + dd.Rows.Count, kk, kk));
}
if (kk > 26 && kk < 29)
{
//0到16列全部合并单元格
sheet.AddMergedRegion(new CellRangeAddress(rowIndex, rowIndex + dd.Rows.Count, kk, kk));
}
HSSFCell newCell;
string drValue;
//if ((kk > 16 && kk < 27) || (kk > 26 && kk < 29))
//{
// int f = 0;
// foreach (DataRow row1 in dd.Rows)
// {
// rowIndex++;
// foreach (DataColumn column1 in dd.Columns)
// {
// newCell = (HSSFCell)dataRow.CreateCell(kk+column1.Ordinal);
// drValue = row1[column1].ToString();
// switch (column1.DataType.ToString())
// {
// case "System.String"://字符串类型
// newCell.SetCellValue(drValue);
// break;
// case "System.DateTime"://日期类型
// System.DateTime dateV;
// System.DateTime.TryParse(drValue, out dateV);
// newCell.SetCellValue(dateV);
// newCell.CellStyle = dateStyle;//格式化显示
// break;
// case "System.Boolean"://布尔型
// bool boolV = false;
// bool.TryParse(drValue, out boolV);
// newCell.SetCellValue(boolV);
// break;
// case "System.Int16"://整型
// case "System.Int32":
// case "System.Int64":
// case "System.Byte":
// int intV = 0;
// int.TryParse(drValue, out intV);
// newCell.SetCellValue(intV);
// break;
// case "System.Decimal"://浮点型
// case "System.Double":
// double doubV = 0;
// double.TryParse(drValue, out doubV);
// newCell.SetCellValue(doubV);
// break;
// case "System.DBNull"://空值处理
// newCell.SetCellValue("");
// break;
// default:
// newCell.SetCellValue("");
// break;
// }
// }
// f++;
// }
//}
//else
{
newCell = (HSSFCell)dataRow.CreateCell(column.Ordinal);
drValue = row[column].ToString();
switch (column.DataType.ToString())
{
case "System.String": //字符串类型
newCell.SetCellValue(drValue);
break;
case "System.DateTime": //日期类型
System.DateTime dateV;
System.DateTime.TryParse(drValue, out dateV);
newCell.SetCellValue(dateV);
newCell.CellStyle = dateStyle; //格式化显示
break;
case "System.Boolean": //布尔型
bool boolV = false;
bool.TryParse(drValue, out boolV);
newCell.SetCellValue(boolV);
break;
case "System.Int16": //整型
case "System.Int32":
case "System.Int64":
case "System.Byte":
int intV = 0;
int.TryParse(drValue, out intV);
newCell.SetCellValue(intV);
break;
case "System.Decimal": //浮点型
case "System.Double":
double doubV = 0;
double.TryParse(drValue, out doubV);
newCell.SetCellValue(doubV);
break;
case "System.DBNull": //空值处理
newCell.SetCellValue("");
break;
default:
newCell.SetCellValue("");
break;
}
}
kk++;
}
#endregion
rowIndex += dd.Rows.Count;
rowIndex++;
}
using (MemoryStream ms = new MemoryStream())
{
workbook.Write(ms);
ms.Flush();
ms.Position = 0;
// sheet.Dispose();
//workbook.Dispose();//一般只用写这一个就OK了，他会遍历并释放所有资源，但当前版本有问题所以只释放sheet
return(ms);
}
}