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1.准备npoi 的 dll：
下载地址：
https://npoi.codeplex.com/releases
2、引用
3、代码
/// <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="SFBT">表头文本是否显示</param>
public static void Export(DataTable dtSource, string strHeaderText, string strFileName,bool SFBT)
{
using (MemoryStream ms = Export(dtSource, strHeaderText,SFBT))
{
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="SFBT">表头文本是否显示</param>
public static MemoryStream Export(DataTable dtSource, string strHeaderText,bool SFBT)
{
HSSFWorkbook workbook = new HSSFWorkbook();
ISheet sheet = workbook.CreateSheet();
ICellStyle dateStyle = workbook.CreateCellStyle();
IDataFormat format = workbook.CreateDataFormat();
dateStyle.DataFormat = format.GetFormat("yyyy-MM-dd");
#region 取得每列的列宽（最大宽度）
int[] arrColWidth = new int[dtSource.Columns.Count];
foreach (DataColumn item in dtSource.Columns)
{
//GBK对应的code page是CP936
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;
}
}
}
#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();
}
if (SFBT)
{
#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 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);
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 = 2;
}
else
{
#region 列头及样式
{
IRow headerRow = sheet.CreateRow(0);
ICellStyle headStyle = workbook.CreateCellStyle();
headStyle.Alignment = HorizontalAlignment.Center;
IFont font = 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);
}
}
#endregion
rowIndex = 1;
}
}
#endregion
#region 填充内容
ICellStyle contentStyle = workbook.CreateCellStyle();
contentStyle.Alignment = HorizontalAlignment.Left;
IRow dataRow = sheet.CreateRow(rowIndex);
foreach (DataColumn column in dtSource.Columns)
{
ICell newCell = dataRow.CreateCell(column.Ordinal);
newCell.CellStyle = contentStyle;
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;
}
}
1、获取excel 数据并转换成 datatable.
//获取全部数据 HDR=Yes，这代表第一行是标题，不做为数据使用 ，如果用HDR=NO，则表示第一行不是标题，做为数据来使用。系统默认的是YES
string strConn2003 = "Provider = Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + excelFile + ";" + Extended Properties = 'Excel 8.0;HDR=Yes;'";
string strConn2007 = "Provider = Microsoft.ACE.OLEDB.12.0;Data Source=" + excelFile + ";Extended Properties='Excel 12.0;HDR=YES'";
OleDbConnection conn = new OleDbConnection(strConn2003);
conn.Open();
string strExcel = "";
OleDbDataAdapter myCommand = null;
strExcel = string.Format("select * from [{0}$]", sheetName);
myCommand = new OleDbDataAdapter(strExcel, strConn2003);
myCommand.Fill(ds, sheetName);
2、用bcp导入数据
//excel文件中列的顺序必须和数据表的列顺序一致，因为数据导入时，是从excel文件的第二行数据开始，不管数据表的结构是什么样的，反正就是第一列的数据会插入到数据表的第一列字段中，第二列的数据插入到数据表的第二列字段中，以此类推，它本身不会去判断要插入的数据是对应数据表中哪一个字段的
using (System.Data.SqlClient.SqlBulkCopy bcp = new System.Data.SqlClient.SqlBulkCopy(Rejoy.DataHelper.Connection.strConn))
{
//bcp.SqlRowsCopied += new System.Data.SqlClient.SqlRowsCopiedEventHandler(bcp_SqlRowsCopied);
bcp.BatchSize = 100;//每次传输的行数
bcp.NotifyAfter = 100;//进度提示的行数
bcp.DestinationTableName = "FDCSCJCXX_YSZJJG.dbo.SQ_HTRZ_HT";//目标表
DataTable dt = RBase.JSONToDataTable(excelFile); //ds.Tables[0];
foreach (DataColumn dc in dt.Columns)
{
//源列字段：A，目标数据源字段：B
if (dc.ColumnName == "申请编号")
{
bcp.ColumnMappings.Add(dc.ColumnName, "SQBH");
}
if (dc.ColumnName == "申请BSM")
{
bcp.ColumnMappings.Add(dc.ColumnName, "SQBSM");
}
if (dc.ColumnName == "监管编号")
{
bcp.ColumnMappings.Add(dc.ColumnName, "JGBH");
}
if (dc.ColumnName == "合同标识码")
{
bcp.ColumnMappings.Add(dc.ColumnName, "HTBSM");
}
if (dc.ColumnName == "申请缴存金额")
{
bcp.ColumnMappings.Add(dc.ColumnName, "RZJE");
}
if (dc.ColumnName == "系统合同号")
{
bcp.ColumnMappings.Add(dc.ColumnName, "XTHTH");
}
if (dc.ColumnName == "有效性")
{
bcp.ColumnMappings.Add(dc.ColumnName, "YXX");
}
if (dc.ColumnName == "是否选择")
{
bcp.ColumnMappings.Add(dc.ColumnName, "SFXZ");
}
}
bcp.WriteToServer(dt);
}
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