调用方法：
ExcelHelper.Export(dtTemp, "供应商App", DlgSave.FileName, "物料文档"
, new string[10] { "MatterCode", "MatterName", "MatterType", "MainUnit", "TagModelName", "LotName", "FMatterCode", "FMatterName", "FMatterType", "TagNumber" }
, new string[10] { "MatterCode", "MatterName", "MatterType", "MainUnit", "TagModelName", "LotName", "FMatterCode", "FMatterName", "FMatterType", "TagNumber" });
/// <summary>
/// DataTable导出到Excel文件
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表头文本</param>
/// <param name="strFileName">保存位置</param>
/// <param name="strSheetName">工作表名称</param>
public static void Export(DataTable dtSource, string strHeaderText, string strFileName, string strSheetName, string[] oldColumnNames, string[] newColumnNames)
{
if (strSheetName == "")
{
strSheetName = "Sheet";
}
using (MemoryStream ms = Export(dtSource, strHeaderText, strSheetName, oldColumnNames, newColumnNames))
{
using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
{
byte[] data = ms.ToArray();
fs.Write(data, 0, data.Length);
fs.Flush();
}
}
}
/// <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();
//HSSFSheet sheet = workbook.CreateSheet();// workbook.CreateSheet();
ISheet sheet = workbook.CreateSheet(strSheetName);
#region 右击文件 属性信息
{
DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
dsi.Company = "";
workbook.DocumentSummaryInformation = dsi;
SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
//填加xls文件作者信息
si.Author = "";
si.ApplicationName = ""; //填加xls文件创建程序信息
si.LastAuthor = ""; //填加xls文件最后保存者信息
si.Comments = ""; //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;
}
/*
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 < oldColumnNames.Length; j++)
{
int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][oldColumnNames[j]].ToString()).Length;
if (intTemp > arrColWidth[j])
{
arrColWidth[j] = intTemp;
}
}
/*
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;
}
}
* */
}
#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 = NPOI.SS.UserModel.HorizontalAlignment.CENTER;
// IFont font = 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));
// sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(0, 0, 0, oldColumnNames.Length - 1));
//}
#endregion
#region 列头及样式
{
//HSSFRow headerRow = sheet.CreateRow(1);
IRow headerRow = sheet.CreateRow(0);
ICellStyle headStyle = workbook.CreateCellStyle();
headStyle.Alignment = NPOI.SS.UserModel.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);
}
/*
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);
}
* */
}
#endregion
rowIndex = 1;
}
#endregion
#region 填充内容
IRow dataRow = sheet.CreateRow(rowIndex);
//foreach (DataColumn column in dtSource.Columns)
for (int i = 0; i < oldColumnNames.Length; i++)
{
ICell newCell = dataRow.CreateCell(i);
string drValue = row[oldColumnNames[i]].ToString();
switch (dtSource.Columns[oldColumnNames[i]].DataType.ToString())
{
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.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;
}
}
#endregion
rowIndex++;
}
using (MemoryStream ms = new MemoryStream())
{
workbook.Write(ms);
ms.Flush();
ms.Position = 0;
//sheet.Dispose();
sheet = null;
workbook = null;
//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;
}
}
