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protected void btn_import_07_click(object o, EventArgs e) { var name = DateTime.Now.ToString("yyyyMMddhhmmss") + new Random(DateTime.Now.Second).Next(10000); var path = Server.MapPath("~/xls_down/" + name + ".xls"); if (File.Exists(path)) { } else { DirectoryInfo directory = new DirectoryInfo(@"C:\部门数据导出"); directory.Create(); FileInfo file1 = new FileInfo(@"C:\部门数据导出\" + name + ".xlsx"); } DataTable dt = (DataTable)Session["shuju"]; var path2 = @"C:\部门数据导出\" + name + ".xlsx"; //var path2 = Server.MapPath("~/xls_down/" + name + ".xls"); DbHelper.DAL.x2007.TableToExcelForXLSX(dt, path2); //downloadfile(path2); ScriptManager.RegisterClientScriptBlock(UpdatePanel1, this.GetType(), "js", "setpageorver1();", true); }需要引用 using NPOI.HSSF.UserModel; using NPOI.SS.UserModel; using NPOI.XSSF.UserModel;
<asp:Button runat="server" Text="读取xls(03)到GridView" />
<asp:Button runat="server" Text="读取xls(07)到GridView"/>
<asp:Button runat="server" Text="导出xls(03)33333条数据"/>
<asp:Button runat="server" Text="导出xls(07)33333条数据"/>
<asp:GridView runat="server" AutoGenerateColumns="true"></asp:GridView>
protected void btn_read_03_click(object o, EventArgs e)
{
var dt = ExcelHelper.GetDataTable(Server.MapPath("~/xls_tmp/2003.xls"));
g1.DataSource = dt;
g1.DataBind();
}
protected void btn_read_07_click(object o, EventArgs e)
{
var dt = ExcelHelper.GetDataTable(Server.MapPath("~/xls_tmp/2007.xlsx"));
g1.DataSource = dt;
g1.DataBind();
}
protected void btn_import_03_click(object o, EventArgs e)
{
var name = DateTime.Now.ToString("yyyyMMddhhmmss") + new Random(DateTime.Now.Second).Next(10000);
var path = Server.MapPath("~/xls_down/" + name + ".xls");
var dt = new System.Data.DataTable();
var Columns=Enumerable.Range(1, 10).Select(d => new DataColumn("a"+d.ToString(), typeof(string))).ToArray();
dt.Columns.AddRange(Columns);
for (int i = 0; i < 33333; i++)
{
var id = Guid.NewGuid().ToString();
dt.Rows.Add(id, id, id, id, id, id, id, id, id, id);
}
ExcelHelper.x2003.TableToExcelForXLS(dt, path);
downloadfile(path);
}
protected void btn_import_07_click(object o, EventArgs e)
{
var name = DateTime.Now.ToString("yyyyMMddhhmmss") + new Random(DateTime.Now.Second).Next(10000);
var path = Server.MapPath("~/xls_down/" + name + ".xlsx");
var dt = new System.Data.DataTable();
var Columns = Enumerable.Range(1, 10).Select(d => new DataColumn("a" + d.ToString(), typeof(string))).ToArray();
dt.Columns.AddRange(Columns);
for (int i = 0; i < 33333; i++)
{
var id = Guid.NewGuid().ToString();
dt.Rows.Add(id, id, id, id, id, id, id, id, id, id);
}
ExcelHelper.x2007.TableToExcelForXLSX(dt, path);
downloadfile(path);
}
void downloadfile(string s_path)
{
System.IO.FileInfo file = new System.IO.FileInfo(s_path);
HttpContext.Current.Response.ContentType = "application/ms-download";
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.AddHeader("Content-Type", "application/octet-stream");
HttpContext.Current.Response.Charset = "utf-8";
HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=" + System.Web.HttpUtility.UrlEncode(file.Name, System.Text.Encoding.UTF8));
HttpContext.Current.Response.AddHeader("Content-Length", file.Length.ToString());
HttpContext.Current.Response.WriteFile(file.FullName);
HttpContext.Current.Response.Flush();
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.End();
}
public class x2003 { #region Excel2003 /// <summary> /// 将Excel文件中的数据读出到DataTable中(xls) /// </summary> /// <param name="file"></param> /// <returns></returns> public static DataTable ExcelToTableForXLS(string file) { DataTable dt = new DataTable(); using (FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read)) { HSSFWorkbook hssfworkbook = new HSSFWorkbook(fs); ISheet sheet = hssfworkbook.GetSheetAt(0); //表头 IRow header = sheet.GetRow(sheet.FirstRowNum); List<int> columns = new List<int>(); for (int i = 0; i < header.LastCellNum; i++) { object obj = GetValueTypeForXLS(header.GetCell(i) as HSSFCell); if (obj == null || obj.ToString() == string.Empty) { dt.Columns.Add(new DataColumn("Columns" + i.ToString())); //continue; } else dt.Columns.Add(new DataColumn(obj.ToString())); columns.Add(i); } //数据 for (int i = sheet.FirstRowNum + 1; i <= sheet.LastRowNum; i++) { DataRow dr = dt.NewRow(); bool hasValue = false; foreach (int j in columns) { dr[j] = GetValueTypeForXLS(sheet.GetRow(i).GetCell(j) as HSSFCell); if (dr[j] != null && dr[j].ToString() != string.Empty) { hasValue = true; } } if (hasValue) { dt.Rows.Add(dr); } } } return dt; } /// <summary> /// 将DataTable数据导出到Excel文件中(xls) /// </summary> /// <param name="dt"></param> /// <param name="file"></param> public static void TableToExcelForXLS(DataTable dt, string file) { HSSFWorkbook hssfworkbook = new HSSFWorkbook(); ISheet sheet = hssfworkbook.CreateSheet("Test"); //表头 IRow row = sheet.CreateRow(0); for (int i = 0; i < dt.Columns.Count; i++) { ICell cell = row.CreateCell(i); cell.SetCellValue(dt.Columns[i].ColumnName); } //数据 for (int i = 0; i < dt.Rows.Count; i++) { IRow row1 = sheet.CreateRow(i + 1); for (int j = 0; j < dt.Columns.Count; j++) { ICell cell = row1.CreateCell(j); cell.SetCellValue(dt.Rows[i][j].ToString()); } } //转为字节数组 MemoryStream stream = new MemoryStream(); hssfworkbook.Write(stream); var buf = stream.ToArray(); //生存为Excel文件 using (FileStream fs = new FileStream(file, FileMode.Create, FileAccess.Write)) { fs.Write(buf, 0, buf.Length); fs.Flush(); } } /// <summary> /// 获取单元格类型(xls) /// </summary> /// <param name="cell"></param> /// <returns></returns> private static object GetValueTypeForXLS(HSSFCell cell) { if (cell == null) return null; switch (cell.CellType) { case CellType.Blank: //BLANK: return null; case CellType.Boolean: //BOOLEAN: return cell.BooleanCellValue; case CellType.Numeric: //NUMERIC: return cell.NumericCellValue; case CellType.String: //STRING: return cell.StringCellValue; case CellType.Error: //ERROR: return cell.ErrorCellValue; case CellType.Formula: //FORMULA: default: return "=" + cell.CellFormula; } } #endregion } public class x2007 { #region Excel2007 /// <summary> /// 将Excel文件中的数据读出到DataTable中(xlsx) /// </summary> /// <param name="file"></param> /// <returns></returns> public static DataTable ExcelToTableForXLSX(string file) { DataTable dt = new DataTable(); using (FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read)) { XSSFWorkbook xssfworkbook = new XSSFWorkbook(fs); ISheet sheet = xssfworkbook.GetSheetAt(0); //表头 IRow header = sheet.GetRow(sheet.FirstRowNum); List<int> columns = new List<int>(); for (int i = 0; i < header.LastCellNum; i++) { object obj = GetValueTypeForXLSX(header.GetCell(i) as XSSFCell); if (obj == null || obj.ToString() == string.Empty) { dt.Columns.Add(new DataColumn("Columns" + i.ToString())); //continue; } else dt.Columns.Add(new DataColumn(obj.ToString())); columns.Add(i); } //数据 for (int i = sheet.FirstRowNum + 1; i <= sheet.LastRowNum; i++) { DataRow dr = dt.NewRow(); bool hasValue = false; foreach (int j in columns) { dr[j] = GetValueTypeForXLSX(sheet.GetRow(i).GetCell(j) as XSSFCell); if (dr[j] != null && dr[j].ToString() != string.Empty) { hasValue = true; } } if (hasValue) { dt.Rows.Add(dr); } } } return dt; } /// <summary> /// 将DataTable数据导出到Excel文件中(xlsx) /// </summary> /// <param name="dt"></param> /// <param name="file"></param> public static void TableToExcelForXLSX(DataTable dt, string file) { XSSFWorkbook xssfworkbook = new XSSFWorkbook(); ISheet sheet = xssfworkbook.CreateSheet("Test"); //表头 IRow row = sheet.CreateRow(0); for (int i = 0; i < dt.Columns.Count; i++) { ICell cell = row.CreateCell(i); cell.SetCellValue(dt.Columns[i].ColumnName); } //数据 for (int i = 0; i < dt.Rows.Count; i++) { IRow row1 = sheet.CreateRow(i + 1); for (int j = 0; j < dt.Columns.Count; j++) { ICell cell = row1.CreateCell(j); cell.SetCellValue(dt.Rows[i][j].ToString()); } } //转为字节数组 MemoryStream stream = new MemoryStream(); xssfworkbook.Write(stream); var buf = stream.ToArray(); //生存为Excel文件 using (FileStream fs = new FileStream(file, FileMode.Create, FileAccess.Write)) { fs.Write(buf, 0, buf.Length); fs.Flush(); } } /// <summary> /// 获取单元格类型(xlsx) /// </summary> /// <param name="cell"></param> /// <returns></returns> private static object GetValueTypeForXLSX(XSSFCell cell) { if (cell == null) return null; switch (cell.CellType) { case CellType.Blank: //BLANK: return null; case CellType.Boolean: //BOOLEAN: return cell.BooleanCellValue; case CellType.Numeric: //NUMERIC: return cell.NumericCellValue; case CellType.String: //STRING: return cell.StringCellValue; case CellType.Error: //ERROR: return cell.ErrorCellValue; case CellType.Formula: //FORMULA: default: return "=" + cell.CellFormula; } } #endregion } public static DataTable GetDataTable(string filepath) { var dt = new DataTable("xls"); if (filepath.Last() == ‘s‘) { dt = x2003.ExcelToTableForXLS(filepath); } else { dt = x2007.ExcelToTableForXLSX(filepath); } return d
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原文地点：https://www.cnblogs.com/otsf/p/8761284.html
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