using NPOI.HSSF.UserModel;
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using NPOI.SS.UserModel;
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using System;
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using System.Collections.Generic;
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using System.Data;
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using System.Data.OleDb;
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using System.IO;
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using System.Linq;
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using System.Threading.Tasks;
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namespace VueWebCoreApi.Tools
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{
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public class NPOIHelper
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{
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/// <summary>
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/// NPOI简单Demo，快速入门代码
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/// </summary>
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/// <param name="dtSource"></param>
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/// <param name="strFileName"></param>
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/// <remarks>NPOI认为Excel的第一个单元格是：(0，0)</remarks>
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/// <Author>柳永法 http://www.yongfa365.com/ 2010-5-8 22:21:41</Author>
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public static void ExportEasy(DataTable dtSource, string strFileName)
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{
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HSSFWorkbook workbook = new HSSFWorkbook();
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ISheet sheet = workbook.CreateSheet();
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//填充表头
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IRow dataRow = sheet.CreateRow(0);
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foreach (DataColumn column in dtSource.Columns)
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{
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dataRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
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}
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//填充内容
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for (int i = 0; i < dtSource.Rows.Count; i++)
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{
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dataRow = sheet.CreateRow(i + 1);
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for (int j = 0; j < dtSource.Columns.Count; j++)
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{
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dataRow.CreateCell(j).SetCellValue(dtSource.Rows[i][j].ToString());
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}
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}
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//保存
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using (MemoryStream ms = new MemoryStream())
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{
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using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
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{
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workbook.Write(ms);
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ms.Flush();
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ms.Position = 0;
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byte[] data = ms.ToArray();
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fs.Write(data, 0, data.Length);
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fs.Flush();
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}
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}
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//workbook.Dispose();
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}
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public static System.Data.DataTable GetExcelDatatable(string fileUrl)
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{
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string strConn = "Provider=Microsoft.Ace.OleDb.12.0;" + "data source=" + fileUrl + ";Extended Properties='Excel 12.0; HDR=Yes; IMEX=1'";
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DataSet myDataSet = new DataSet();
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//连接串
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OleDbConnection conn = new OleDbConnection(strConn);
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conn.Open();
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//返回Excel的架构，包括各个sheet表的名称,类型，创建时间和修改时间等
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DataTable dtSheetName = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "Table" });
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//包含excel中表名的字符串数组
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string[] strTableNames = new string[dtSheetName.Rows.Count];
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for (int k = 0; k < dtSheetName.Rows.Count; k++)
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{
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strTableNames[k] = dtSheetName.Rows[k]["TABLE_NAME"].ToString();
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}
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OleDbDataAdapter myCommand = null;
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DataTable dt = new DataTable();
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//从指定的表明查询数据,可先把所有表明列出来供用户选择
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string strExcel = "select*from[" + strTableNames[0] + "]";
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myCommand = new OleDbDataAdapter(strExcel, strConn);
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//myCommand.Fill(dt);
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myCommand.Fill(myDataSet, "ExcelInfo");
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conn.Close();
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DataTable ExcelTable = myDataSet.Tables["ExcelInfo"].DefaultView.ToTable();
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return ExcelTable;
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}
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/// <summary>
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/// 多个sheet导入
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/// </summary>
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/// <param name="fileUrl"></param>
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/// <returns></returns>
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public static List<DataTable> GetExcelDatatableList(string fileUrl)
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{
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List<DataTable> list = new List<DataTable>();
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string strConn = "Provider=Microsoft.Ace.OleDb.12.0;" + "data source=" + fileUrl + ";Extended Properties='Excel 12.0; HDR=Yes; IMEX=1'";
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DataSet myDataSet = new DataSet();
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//连接串
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OleDbConnection conn = new OleDbConnection(strConn);
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conn.Open();
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//返回Excel的架构，包括各个sheet表的名称,类型，创建时间和修改时间等
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DataTable dtSheetName = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "Table" });
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//包含excel中表名的字符串数组
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string[] strTableNames = new string[dtSheetName.Rows.Count];
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for (int k = 0; k < dtSheetName.Rows.Count; k++)
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{
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strTableNames[k] = dtSheetName.Rows[k]["TABLE_NAME"].ToString();
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}
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for (int i = 0; i < strTableNames.Length; i++)
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{
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OleDbDataAdapter myCommand = null;
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DataTable dt = new DataTable();
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//从指定的表明查询数据,可先把所有表明列出来供用户选择
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string strExcel = "select*from[" + strTableNames[i].Trim() + "]";
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myCommand = new OleDbDataAdapter(strExcel, strConn);
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//myCommand.Fill(dt);
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myCommand.Fill(myDataSet, "" + i + "");
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conn.Close();
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DataTable ExcelTable = myDataSet.Tables[i].DefaultView.ToTable();
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list.Add(ExcelTable);
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}
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return list;
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}
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/// <summary>
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/// 多个sheet导入
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/// </summary>
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/// <param name="fileUrl"></param>
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/// <returns></returns>
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public static List<DataTable> GetExcelDatatableListName(string fileUrl)
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{
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List<DataTable> list = new List<DataTable>();
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string strConn = "Provider=Microsoft.Ace.OleDb.12.0;" + "data source=" + fileUrl + ";Extended Properties='Excel 12.0; HDR=Yes; IMEX=1'";
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DataSet myDataSet = new DataSet();
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//连接串
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OleDbConnection conn = new OleDbConnection(strConn);
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conn.Open();
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//返回Excel的架构，包括各个sheet表的名称,类型，创建时间和修改时间等
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DataTable dtSheetName = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "Table" });
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for (int m = 0; m < dtSheetName.Rows.Count; m++)
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{
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string TABLE_NAME = dtSheetName.Rows[m]["TABLE_NAME"].ToString();
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string FilterDatabase = "$FilterDatabase";
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if (TABLE_NAME.Contains(FilterDatabase))
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{
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dtSheetName.Rows.Remove(dtSheetName.Rows[m]);
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}
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}
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//包含excel中表名的字符串数组
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string[] strTableNames = new string[dtSheetName.Rows.Count];
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for (int k = 0; k < dtSheetName.Rows.Count; k++)
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{
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strTableNames[k] = dtSheetName.Rows[k]["TABLE_NAME"].ToString();
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}
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for (int i = 0; i < strTableNames.Length; i++)
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{
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OleDbDataAdapter myCommand = null;
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DataTable dt = new DataTable();
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//从指定的表明查询数据,可先把所有表明列出来供用户选择
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string strExcel = "select*from[" + strTableNames[i].Trim() + "]";
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myCommand = new OleDbDataAdapter(strExcel, strConn);
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//myCommand.Fill(dt);
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myCommand.Fill(myDataSet, "" + i + "");
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conn.Close();
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DataTable ExcelTable = myDataSet.Tables[i].DefaultView.ToTable();
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ExcelTable.TableName = strTableNames[i].Trim();
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list.Add(ExcelTable);
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}
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return list;
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}
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}
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}
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