发布网友 发布时间:2022-04-27 09:18
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懂视网 时间:2022-05-01 09:35
public static MemoryStream DataGridViewToExcel(DataGridView myDgv, string strHeaderText) 2 { 3 HSSFWorkbook workbook = new HSSFWorkbook(); 4 HSSFSheet sheet = (HSSFSheet)workbook.CreateSheet(); 5 6 #region 右击文件 属性信息 7 { 8 DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation(); 9 dsi.Company = "NPOI"; 10 workbook.DocumentSummaryInformation = dsi; 11 12 SummaryInformation si = PropertySetFactory.CreateSummaryInformation(); 13 si.Author = "文件作者信息"; //填加xls文件作者信息 14 si.ApplicationName = "创建程序信息"; //填加xls文件创建程序信息 15 si.LastAuthor = "最后保存者信息"; //填加xls文件最后保存者信息 16 si.Comments = "作者信息"; //填加xls文件作者信息 17 si.Title = "标题信息"; //填加xls文件标题信息 18 si.Subject = "主题信息";//填加文件主题信息 19 si.CreateDateTime = System.DateTime.Now; 20 workbook.SummaryInformation = si; 21 } 22 #endregion 23 24 HSSFCellStyle dateStyle = (HSSFCellStyle)workbook.CreateCellStyle(); 25 HSSFDataFormat format = (HSSFDataFormat)workbook.CreateDataFormat(); 26 dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd"); 27 28 //取得列宽 29 int[] arrColWidth = new int[myDgv.Columns.Count]; 30 foreach (DataGridViewColumn item in myDgv.Columns) 31 { 32 arrColWidth[item.Index] = Encoding.GetEncoding(936).GetBytes(item.HeaderText.ToString()).Length; 33 } 34 //可以在循环里面自己设置列宽 35 for (int i = 0; i < myDgv.Rows.Count; i++) 36 { 37 for (int j = 0; j < myDgv.Columns.Count; j++) 38 { 39 int intTemp = Encoding.GetEncoding(936).GetBytes(myDgv.Rows[i].Cells[j].ToString()).Length; 40 if (intTemp > arrColWidth[j]) 41 { 42 arrColWidth[j] = intTemp/5; 43 } 44 } 45 } 46 int rowIndex = 0; 47 foreach (DataGridViewRow row in myDgv.Rows) 48 { 49 #region 新建表,填充表头,填充列头,样式 50 if (rowIndex == 65535 || rowIndex == 0) 51 { 52 if (rowIndex != 0) 53 { 54 sheet = (HSSFSheet)workbook.CreateSheet(); 55 } 56 57 #region 表头及样式 58 { 59 HSSFRow headerRow = (HSSFRow)sheet.CreateRow(0); 60 headerRow.HeightInPoints = 25; 61 headerRow.CreateCell(0).SetCellValue(strHeaderText); 62 63 HSSFCellStyle headStyle = (HSSFCellStyle)workbook.CreateCellStyle(); 64 // headStyle.Alignment = CellHorizontalAlignment.CENTER; 65 HSSFFont font = (HSSFFont)workbook.CreateFont(); 66 font.FontHeightInPoints = 20; 67 font.Boldweight = 700; 68 headStyle.SetFont(font); 69 headerRow.GetCell(0).CellStyle = headStyle; 70 // sheet.AddMergedRegion(new Region(0, 0, 0, dtSource.Columns.Count - 1)); 71 //headerRow.Dispose(); 72 } 73 #endregion 74 75 76 #region 列头及样式 77 { 78 HSSFRow headerRow = (HSSFRow)sheet.CreateRow(1); 79 HSSFCellStyle headStyle = (HSSFCellStyle)workbook.CreateCellStyle(); 80 //headStyle.Alignment = CellHorizontalAlignment.CENTER; 81 HSSFFont font = (HSSFFont)workbook.CreateFont(); 82 font.FontHeightInPoints = 10; 83 font.Boldweight = 700; 84 headStyle.SetFont(font); 85 foreach (DataGridViewColumn column in myDgv.Columns) 86 { 87 headerRow.CreateCell(column.Index).SetCellValue(column.HeaderText); 88 headerRow.GetCell(column.Index).CellStyle = headStyle; 89 90 //设置列宽 91 sheet.SetColumnWidth(column.Index, (arrColWidth[column.Index] + 1) * 256); 92 } 93 // headerRow.Dispose(); 94 } 95 #endregion 96 97 rowIndex = 2; 98 } 99 #endregion 100 101 102 #region 填充内容 103 HSSFRow dataRow = (HSSFRow)sheet.CreateRow(rowIndex); 104 if (row.Index > 0) 105 { 106 foreach (DataGridViewColumn column in myDgv.Columns) 107 { 108 HSSFCell newCell = (HSSFCell)dataRow.CreateCell(column.Index); 109 110 string drValue = myDgv[column.Index, row.Index-1].Value.ToString(); 111 112 switch (column.ValueType.ToString()) 113 { 114 case "System.String"://字符串类型 115 newCell.SetCellValue(drValue); 116 break; 117 case "System.DateTime"://日期类型 118 System.DateTime dateV; 119 System.DateTime.TryParse(drValue, out dateV); 120 newCell.SetCellValue(dateV); 121 122 newCell.CellStyle = dateStyle;//格式化显示 123 break; 124 case "System.Boolean"://布尔型 125 bool boolV = false; 126 bool.TryParse(drValue, out boolV); 127 newCell.SetCellValue(boolV); 128 break; 129 case "System.Int16"://整型 130 case "System.Int32": 131 case "System.Int64": 132 case "System.Byte": 133 int intV = 0; 134 int.TryParse(drValue, out intV); 135 newCell.SetCellValue(intV); 136 break; 137 case "System.Decimal"://浮点型 138 case "System.Double": 139 double doubV = 0; 140 double.TryParse(drValue, out doubV); 141 newCell.SetCellValue(doubV); 142 break; 143 case "System.DBNull"://空值处理 144 newCell.SetCellValue(""); 145 break; 146 default: 147 newCell.SetCellValue(""); 148 break; 149 } 150 151 } 152 } 153 else 154 { rowIndex--; } 155 #endregion 156 157 rowIndex++; 158 } 159 using (MemoryStream ms = new MemoryStream()) 160 { 161 workbook.Write(ms); 162 ms.Flush(); 163 ms.Position = 0; 164 165 sheet.Dispose(); 166 //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 167 return ms; 168 } 169 }
2、读取excel到DataTable
/// <summary>读取excel /// 默认第一行为标头 /// </summary> /// <param name="strFileName">excel文档路径</param> /// <returns></returns> public static DataTable Import(string strFileName) { DataTable dt = new DataTable(); HSSFWorkbook hssfworkbook; using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read)) { hssfworkbook = new HSSFWorkbook(file); } HSSFSheet sheet = (HSSFSheet)hssfworkbook.GetSheetAt(0); System.Collections.IEnumerator rows = sheet.GetRowEnumerator(); HSSFRow headerRow = (HSSFRow)sheet.GetRow(0); int cellCount = headerRow.LastCellNum; //获取表头 for (int j = 0; j < cellCount; j++) { HSSFCell cell = (HSSFCell)headerRow.GetCell(j); dt.Columns.Add(cell.ToString()); } for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++) { HSSFRow row = (HSSFRow)sheet.GetRow(i); DataRow dataRow = dt.NewRow(); for (int j = row.FirstCellNum; j < cellCount; j++) { if (row.GetCell(j) != null) dataRow[j] = row.GetCell(j).ToString(); } dt.Rows.Add(dataRow); } return dt; }
3、批量导入大批量数据的写法( SqlBulkCopy )
private void btnImport_Click(object sender, EventArgs e) { string constr = System.Configuration.ConfigurationSettings.AppSettings["connstr"].ToString(); #region 选择文件模块 string path = ""; //初始化一个OpenFileDialog类 OpenFileDialog fileDialog = new OpenFileDialog(); //判断用户是否正确的选择了文件 if (fileDialog.ShowDialog() == DialogResult.OK) { //获取用户选择文件的后缀名 string extension = Path.GetExtension(fileDialog.FileName); //声明允许的后缀名 string[] str = new string[] { ".xls" }; if (!((IList)str).Contains(extension)) { MessageBox.Show("仅能上传xls格式的Excel文件!"); } else { //获取用户选择的文件,并判断文件大小不能超过20K,fileInfo.Length是以字节为单位的 FileInfo fileInfo = new FileInfo(fileDialog.FileName); if (fileInfo.Length > 204800000) { MessageBox.Show("上传的Excel不能大于200M"); } else { path = fileDialog.FileName; //在这里就可以写获取到正确文件后的代码了 } } } #endregion System.Diagnostics.Stopwatch timeWatch = System.Diagnostics.Stopwatch.StartNew(); DataTable dtnew = NPOIExcelHelper.Import(path); DataTable ss = GetDt(); if (dt != null && dt.Rows.Count != 0) { int n = 2500; //遍历每一行执行插入操作 foreach (DataRow item in dtnew.Rows) { ss.Rows.Add(n,2, item["专业名称"], item["专业代码"], DateTime.Now, 0); n++; } } SqlBulkCopy sqlbulkcopy = new SqlBulkCopy(constr, SqlBulkCopyOptions.UseInternalTransaction); sqlbulkcopy.DestinationTableName = "COMM_ZZ_COURSE_CLASS";//数据库中的表名 sqlbulkcopy.WriteToServer(ss); timeWatch.Stop(); MessageBox.Show("数据导入成功耗时为:" + timeWatch.Elapsed + ""); }
说明:本人属于新手写文章,水平有限,如果发现文章有错误的地方,欢迎指出,多谢各位朋友,希望大家共同进步
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[原创]Net实现Excel导入导出到数据库(附源码)
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热心网友 时间:2022-05-01 06:43
ASP.NET中将Excel表中的数据导入到数据库中的方法是利用可视化界面工具直接选择字段映射导入。热心网友 时间:2022-05-01 08:01
没有直接的方法。1、要操作Excel,首先需要引用Microsoft Office 11.0 Object Library2、包含using System.Runtime.InteropServices; // For COMExceptionusing Excel; 3.用该命名空间的类。操作Excel得到其中行列数据。得到数据后,存入SqlServer就行了。怎么操作Excel,我就不说了。网上多的是。Copy一下,根据自己的实际情况修改。热心网友 时间:2022-05-01 09:36
if (FileUpload1.PostedFile != null)