引用几个dll
#region 第一行各列字段
DataTable ExcelTable = new DataTable();
ExcelTable.Columns.Add("编号", typeof(string));
ExcelTable.Columns.Add("房屋类型", typeof(string));
ExcelTable.Columns.Add("地址", typeof(string));
ExcelTable.Columns.Add("面积", typeof(string));
ExcelTable.Columns.Add("价格", typeof(string));
ExcelTable.Columns.Add("创造时间", typeof(string));
#endregion
xlsManager xl = new xlsManager();
List<xls> LIST = xl.getList();
#region 遍历
foreach (var test in LIST)
{
var newRow = ExcelTable.NewRow();
newRow["编号"] = test.Id;
newRow["地址"] = test.Address;
newRow["面积"] = test.Area;
newRow["创造时间"] = test.CreateDate;
newRow["房屋类型"] = test.HouseType;
newRow["价格"] = test.Price;
ExcelTable.Rows.Add(newRow);
}
#endregion
#region 生成.XLS
string headName = string.Format("{0}_{1}", DateTime.Now.ToString("yyyy-MM-dd"), LIST[0].Id);
string FileName = "";
FileName = string.Format("{0}_{1}.xls", DateTime.Now.ToString("yyyy-MM-dd"), LIST[0].Id);
ExportByWeb(ExcelTable, headName, FileName);
#endregion
public static List<xls> qwe()
{
List<xls> list = new List<xls>();
string sql = "select * from Houses";
DataTable dt = DBHelper.GetInstance().GetData(sql);
foreach (DataRow item in dt.Rows)
{
xls ho = new xls();
ho.Id = int.Parse(item["Id"].ToString());
ho.Address = item["Address"].ToString();
ho.Area = double.Parse(item["Area"].ToString());
ho.CreateDate = DateTime.Parse(item["CreateDate"].ToString());
ho.HouseType = item["HouseType"].ToString();
ho.Price = double.Parse(item["Price"].ToString());
list.Add(ho);
}
return list;
}
/// <summary>
/// 用于Web导出
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表头文本</param>
/// <param name="strFileName">文件名</param>
public static void ExportByWeb(DataTable dtSource, string strHeaderText, string strFileName)
{
HttpContext curContext = HttpContext.Current;
// 设置编码和附件格式
curContext.Response.ContentType = "application/vnd.ms-excel";
curContext.Response.ContentEncoding = Encoding.UTF8;
curContext.Response.Charset = "";
curContext.Response.AppendHeader("Content-Disposition",
"attachment;filename=" + HttpUtility.UrlEncode(strFileName, Encoding.UTF8));
curContext.Response.BinaryWrite(Export(dtSource, strHeaderText).GetBuffer());
curContext.Response.End();
}
/// <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 Export(DataTable dtSource, string strHeaderText)
{
IWorkbook workbook = new HSSFWorkbook();
ISheet sheet = workbook.CreateSheet();
ICellStyle cellStyle = workbook.CreateCellStyle();
//文字水平和垂直对齐方式
cellStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;
cellStyle.VerticalAlignment = NPOI.SS.UserModel.VerticalAlignment.Center;
//是否换行
cellStyle.WrapText = true;
//缩小字体填充
//cellStyle.ShrinkToFit = true;
var dateStyle = workbook.CreateCellStyle();
var format = 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 == 0)
{
if (rowIndex != 0)
{
sheet = workbook.CreateSheet();
}
#region 表头及样式
var titleRow = sheet.CreateRow(0);
titleRow.HeightInPoints = 25;
var titleCell = titleRow.CreateCell(0);
titleCell.SetCellValue(strHeaderText);
titleCell.CellStyle.CloneStyleFrom(cellStyle);
sheet.AddMergedRegion(new CellRangeAddress(0, 0, 0, dtSource.Columns.Count - 1));
#endregion
#region 列头及样式
{
var headerRow = sheet.CreateRow(1);
foreach (DataColumn column in dtSource.Columns)
{
var headCell = headerRow.CreateCell(column.Ordinal);
headCell.SetCellValue(column.ColumnName);
headerRow.GetCell(column.Ordinal).CellStyle.CloneStyleFrom(cellStyle);
//设置列宽
sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);
}
//headerRow.Dispose();
}
#endregion
rowIndex = 2;
}
#endregion
#region 填充内容
var dataRow = sheet.CreateRow(rowIndex);
foreach (DataColumn column in dtSource.Columns)
{
var newCell = dataRow.CreateCell(column.Ordinal);
string 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
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();
//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;
}
}