/// <summary>
/// DataTable导出到Excel的MemoryStream Export()
/// </summary>
/// <param name="dtSource">DataTable数据源</param>
/// <param name="excelConfig">导出设置包含文件名、标题、列设置</param>
public static MemoryStream ExportMemoryStream(DataTable dtSource, ExcelConfig excelConfig)
{
//int colint = 0;
for (int i = 0; i < dtSource.Columns.Count;)
{
DataColumn column = dtSource.Columns[i];
bool isRemove = true;
for (int j = 0; j < excelConfig.ColumnEntity.Count; j++)
{
if (excelConfig.ColumnEntity[j].Column == column.ColumnName)
{
isRemove = false;
i++;
}
}
if (isRemove)
{
dtSource.Columns.Remove(column.ColumnName);
}
//if (excelConfig.ColumnEntity[colint].Column != column.ColumnName)
//{
// dtSource.Columns.Remove(column.ColumnName);
//}
//else
//{
// i++;
// colint++;
//}
}
HSSFWorkbook workbook = new HSSFWorkbook();
ISheet sheet = 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 = "作者"; //填加xls文件作者信息
si.ApplicationName = "信息"; //填加xls文件创建程序信息
si.LastAuthor = "作者"; //填加xls文件最后保存者信息
si.Comments = "作者"; //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
#region 设置标题样式
ICellStyle headStyle = workbook.CreateCellStyle();
int[] arrColWidth = new int[dtSource.Columns.Count];
string[] arrColName = new string[dtSource.Columns.Count]; //列名
ICellStyle[] arryColumStyle = new ICellStyle[dtSource.Columns.Count]; //样式表
headStyle.Alignment = HorizontalAlignment.Center; // ------------------
if (excelConfig.Background != new Color())
{
if (excelConfig.Background != new Color())
{
headStyle.FillPattern = FillPattern.SolidForeground;
headStyle.FillForegroundColor = GetXLColour(workbook, excelConfig.Background);
}
}
IFont font = workbook.CreateFont();
font.FontHeightInPoints = excelConfig.TitlePoint;
if (excelConfig.ForeColor != new Color())
{
font.Color = GetXLColour(workbook, excelConfig.ForeColor);
}
font.Boldweight = 700;
headStyle.SetFont(font);
#endregion
#region 列头及样式
ICellStyle cHeadStyle = workbook.CreateCellStyle();
cHeadStyle.Alignment = HorizontalAlignment.Center; // ------------------
IFont cfont = workbook.CreateFont();
cfont.FontHeightInPoints = excelConfig.HeadPoint;
cHeadStyle.SetFont(cfont);
#endregion
#region 设置内容单元格样式
foreach (DataColumn item in dtSource.Columns)
{
ICellStyle columnStyle = workbook.CreateCellStyle();
columnStyle.Alignment = HorizontalAlignment.Center;
arrColWidth[item.Ordinal] = Encoding.GetEncoding(936).GetBytes(item.ColumnName.ToString()).Length;
arrColName[item.Ordinal] = item.ColumnName.ToString();
if (excelConfig.ColumnEntity != null)
{
ColumnEntity columnentity = excelConfig.ColumnEntity.Find(t => t.Column == item.ColumnName);
if (columnentity != null)
{
arrColName[item.Ordinal] = columnentity.ExcelColumn;
if (columnentity.Width != 0)
{
arrColWidth[item.Ordinal] = columnentity.Width;
}
if (columnentity.Background != new Color())
{
if (columnentity.Background != new Color())
{
columnStyle.FillPattern = FillPattern.SolidForeground;
columnStyle.FillForegroundColor = GetXLColour(workbook, columnentity.Background);
}
}
if (columnentity.Font != null || columnentity.Point != 0 || columnentity.ForeColor != new Color())
{
IFont columnFont = workbook.CreateFont();
columnFont.FontHeightInPoints = 10;
if (columnentity.Font != null)
{
columnFont.FontName = columnentity.Font;
}
if (columnentity.Point != 0)
{
columnFont.FontHeightInPoints = columnentity.Point;
}
if (columnentity.ForeColor != new Color())
{
columnFont.Color = GetXLColour(workbook, columnentity.ForeColor);
}
columnStyle.SetFont(font);
}
columnStyle.Alignment = getAlignment(columnentity.Alignment);
}
}
arryColumStyle[item.Ordinal] = columnStyle;
}
if (excelConfig.IsAllSizeColumn)
{
#region 根据列中最长列的长度取得列宽
for (int i = 0; i < dtSource.Rows.Count; i++)
{
for (int j = 0; j < dtSource.Columns.Count; j++)
{
if (arrColWidth[j] != 0)
{
int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length;
if (intTemp > arrColWidth[j])
{
arrColWidth[j] = intTemp;
}
}
}
}
#endregion
}
#endregion
#region 填充数据
#endregion
ICellStyle dateStyle = workbook.CreateCellStyle();
IDataFormat format = workbook.CreateDataFormat();
dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");
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();
}
#region 表头及样式
{
if (excelConfig.Title != null)
{
IRow headerRow = sheet.CreateRow(0);
if (excelConfig.TitleHeight != 0)
{
headerRow.Height = (short)(excelConfig.TitleHeight * 20);
}
headerRow.HeightInPoints = 25;
headerRow.CreateCell(0).SetCellValue(excelConfig.Title);
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);
#region 如果设置了列标题就按列标题定义列头，没定义直接按字段名输出
foreach (DataColumn column in dtSource.Columns)
{
headerRow.CreateCell(column.Ordinal).SetCellValue(arrColName[column.Ordinal]);
headerRow.GetCell(column.Ordinal).CellStyle = cHeadStyle;
//设置列宽
sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);
}
#endregion
}
#endregion
rowIndex = 2;
}
#endregion
#region 填充内容
IRow dataRow = sheet.CreateRow(rowIndex);
foreach (DataColumn column in dtSource.Columns)
{
ICell newCell = dataRow.CreateCell(column.Ordinal);
newCell.CellStyle = arryColumStyle[column.Ordinal];
string drValue = row[column].ToString().Replace("<i class=\"fa fa-toggle-off\"></i>", "否").Replace("<i class=\"fa fa-toggle-on\"></i>", "是");
SetCell(newCell, dateStyle, column.DataType, drValue);
}
#endregion
rowIndex++;
}
using (MemoryStream ms = new MemoryStream())
{
workbook.Write(ms);
ms.Flush();
ms.Position = 0;
return(ms);
}
}