这儿采取的是将图片的二进制流导出到Excel，直接上代码：
/// <summary>
/// DataTable导出到Excel的MemoryStream
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表头文本</param>
/// <param name="strSheetName">工作表名称</param>
public static MemoryStream Export(DataTable dtSource, string strHeaderText, string strSheetName, string[] oldColumnNames, string[] newColumnNames)
{
if (oldColumnNames.Length != newColumnNames.Length)
{
return new MemoryStream();
}
HSSFWorkbook workbook = new HSSFWorkbook();
ISheet sheet = workbook.CreateSheet(strSheetName);
#region 右击文件 属性信息
{
DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
dsi.Company = "http://....../";
workbook.DocumentSummaryInformation = dsi;
SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
if (HttpContext.Current.Session["realname"] != null)
{
si.Author = HttpContext.Current.Session["realname"].ToString();
}
else
{
if (HttpContext.Current.Session["username"] != null)
{
si.Author = HttpContext.Current.Session["username"].ToString();
}
} //填加xls文件作者信息
si.ApplicationName = "NPOI"; //填加xls文件创建程序信息
si.LastAuthor = "OA系统"; //填加xls文件最后保存者信息
si.Comments = "OA系统自动创建文件"; //填加xls文件作者信息
si.Title = strHeaderText; //填加xls文件标题信息
si.Subject = strHeaderText; //填加文件主题信息
si.CreateDateTime = DateTime.Now;
workbook.SummaryInformation = si;
}
#endregion
ICellStyle dateStyle = workbook.CreateCellStyle();
IDataFormat format = workbook.CreateDataFormat();
dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");
#region 取得列宽
int[] arrColWidth = new int[oldColumnNames.Length];
for (int i = 0; i < oldColumnNames.Length; i++)
{
arrColWidth[i] = Encoding.GetEncoding(936).GetBytes(newColumnNames[i]).Length;
}
for (int i = 0; i < dtSource.Rows.Count; i++)
{
for (int j = 0; j < oldColumnNames.Length; j++)
{
int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][oldColumnNames[j]].ToString()).Length;
if (intTemp > arrColWidth[j])
{
arrColWidth[j] = intTemp;
}
}
}
#endregion
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 = workbook.CreateSheet(strSheetName + ((int)rowIndex / 65535).ToString());
}
#region 表头及样式
{
IRow headerRow = sheet.CreateRow(0);
headerRow.HeightInPoints = 25;
headerRow.CreateCell(0).SetCellValue(strHeaderText);
ICellStyle headStyle = workbook.CreateCellStyle();
headStyle.Alignment = HorizontalAlignment.Center;
IFont font = workbook.CreateFont();
font.FontHeightInPoints = 20;
font.Boldweight = 700;
headStyle.SetFont(font);
headerRow.GetCell(0).CellStyle = headStyle;
sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(0, 0, 0, dtSource.Columns.Count - 1));
}
#endregion
#region 列头及样式
{
IRow headerRow = sheet.CreateRow(1);
ICellStyle headStyle = workbook.CreateCellStyle();
headStyle.Alignment = HorizontalAlignment.Center;
IFont font = workbook.CreateFont();
font.FontHeightInPoints = 10;
font.Boldweight = 700;
headStyle.SetFont(font);
for (int i = 0; i < oldColumnNames.Length; i++)
{
headerRow.CreateCell(i).SetCellValue(newColumnNames[i]);
headerRow.GetCell(i).CellStyle = headStyle;
//设置列宽
sheet.SetColumnWidth(i, (arrColWidth[i] + 1) * 256);
}
}
#endregion
rowIndex = 2;
}
#endregion
#region 填充内容
IRow dataRow = sheet.CreateRow(rowIndex);
for (int i = 0; i < oldColumnNames.Length; i++)
{
ICell newCell = dataRow.CreateCell(i);
bool hasImage = false;
string drValue = row[oldColumnNames[i]].ToString();
switch (dtSource.Columns[oldColumnNames[i]].DataType.ToString())
{
case "System.Guid"://GUID类型
case "System.String"://字符串类型
newCell.SetCellValue(drValue);
break;
case "System.DateTime"://日期类型
DateTime dateV;
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.Byte[]"://二进制流
int pictureIdx = 0;
if (row[oldColumnNames[i]] == null || string.IsNullOrEmpty(drValue))
{
newCell.SetCellValue("");
break;
}
pictureIdx = workbook.AddPicture((byte[])row[oldColumnNames[i]], PictureType.JPEG);
HSSFPatriarch patriarch = (HSSFPatriarch)sheet.CreateDrawingPatriarch();
HSSFClientAnchor anchor = new HSSFClientAnchor(10, 0, 2, 0, i, rowIndex, i + 1, rowIndex + 1);
//##处理照片位置，【图片左上角为（col, row）第row+1行col+1列，右下角为（ col +1, row +1）第 col +1+1行row +1+1列，第三个参数为宽，第四个参数为高
HSSFPicture pict = (HSSFPicture)patriarch.CreatePicture(anchor, pictureIdx);
// pict.Resize();//这句话一定不要，这是用图片原始大小来显示
hasImage = true;
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;
}
if (hasImage)
{
dataRow.HeightInPoints = 80;
}
}
#endregion
rowIndex++;
}
using (MemoryStream ms = new MemoryStream())
{
workbook.Write(ms);
ms.Flush();
ms.Position = 0;
sheet = null;
workbook = null;
return ms;
}
}
注意填充内容里的switch循环里的 System.Byte[] ，也就是判断图片流并将转换后的图片输出到Excel的方法。
时间： 2024-10-08 17:14:59