前言
本文对应的场景是导入Excel数据,Excel对应的字段都配置在xml文件中。截图如下:
代码实战
工具类
实体类:XMLReadModel.cs
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public class XMLReadModel { /// <summary> /// 导入所需键值对 /// </summary> public Hashtable ImportHashtable { set ; get ; } = new Hashtable(); /// <summary> /// 导出所需键值对 /// </summary> public Hashtable ExportHashtable { set ; get ; } = new Hashtable(); } |
工具方法:读取xml文件内容到实体中。
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/// <summary> /// 读取xml文件到hashtable /// </summary> public static XMLReadModel ReadToHashtable( string path) { var xr = new XMLReadModel(); var xmldoc = new XmlDocument(); xmldoc.Load(path); //获取节点列表 var topM = xmldoc.SelectNodes( "//ColumnName" ); foreach (XmlElement element in topM) { var enabled = element.Attributes[0].Value; if (enabled == "true" ) //字段启用 { var dbProperty = element.GetElementsByTagName( "DbProperty" )[0].InnerText; var excelProperty = element.GetElementsByTagName( "ExcelProperty" )[0].InnerText; if (!xr.ImportHashtable.ContainsKey(excelProperty)) { xr.ImportHashtable.Add(excelProperty, dbProperty); } if (!xr.ExportHashtable.ContainsKey(dbProperty)) { xr.ExportHashtable.Add(dbProperty, excelProperty); } } } return xr; } |
Excel文件内容转成datatable方法
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/// <summary> /// excel文件流转化成datatable /// </summary> public static DataTable ExcelToTableForXLSX(Stream fileStream, Hashtable ht = null , bool haveNote = false ) { var dt = new DataTable(); using (var fs = fileStream) { var xssfworkbook = new XSSFWorkbook(fs); var sheet = xssfworkbook.GetSheetAt(0); //表头 判断是否包含备注 var firstRowNum = sheet.FirstRowNum; if (haveNote) { firstRowNum += 1; } var header = sheet.GetRow(firstRowNum); var columns = new List< int >(); for (var i = 0; i < header.LastCellNum; i++) { var obj = GetValueTypeForXLSX(header.GetCell(i) as XSSFCell); if (obj == null || obj.ToString() == string .Empty) { dt.Columns.Add( new DataColumn( "Columns" + i.ToString())); //continue; } else { if (ht != null ) { var o = ht[obj.ToString()].ToString(); //这里就是根据xml中读取的字段对应关系进行字段赋值的。 dt.Columns.Add( new DataColumn(o)); } else { dt.Columns.Add( new DataColumn(obj.ToString())); } } columns.Add(i); } //数据 for (var i = firstRowNum + 1; i <= sheet.LastRowNum; i++) { var dr = dt.NewRow(); var hasValue = false ; if (sheet.GetRow(i) == null ) { continue ; } foreach (var j in columns) { var cell = sheet.GetRow(i).GetCell(j); if (cell != null && cell.CellType == CellType.Numeric) { //NPOI中数字和日期都是NUMERIC类型的,这里对其进行判断是否是日期类型 if (DateUtil.IsCellDateFormatted(cell)) //日期类型 { dr[j] = cell.DateCellValue; } else //其他数字类型 { dr[j] = cell.NumericCellValue; } } else { 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; } |
获取Excel单元格值类型,转成C#对应的值类型。
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/// <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; } } |
datatable转成list实体方法
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/// <summary> /// DataTable转成List /// </summary> public static List<T> ToDataList<T>( this DataTable dt) { var list = new List<T>(); var plist = new List<PropertyInfo>( typeof (T).GetProperties()); foreach (DataRow item in dt.Rows) { var s = Activator.CreateInstance<T>(); for (var i = 0; i < dt.Columns.Count; i++) { var info = plist.Find(p => p.Name == dt.Columns[i].ColumnName); if (info != null ) { try { if (!Convert.IsDBNull(item[i])) { object v = null ; if (info.PropertyType.ToString().Contains( "System.Nullable" )) { v = Convert.ChangeType(item[i], Nullable.GetUnderlyingType(info.PropertyType)); } else { if (info.PropertyType.Equals( typeof ( bool ))) { var value = item[i].ToString(); if (value.Equals( "true" , StringComparison.CurrentCultureIgnoreCase) || value.Equals( "false" , StringComparison.CurrentCultureIgnoreCase)) v = Convert.ChangeType(item[i], info.PropertyType); else if (value.Equals( "1" , StringComparison.CurrentCultureIgnoreCase) || value.Equals( "0" , StringComparison.CurrentCultureIgnoreCase)) { if (value.Equals( "1" , StringComparison.CurrentCultureIgnoreCase)) v = true ; else v = false ; } } else { v = Convert.ChangeType(item[i], info.PropertyType); } } info.SetValue(s, v, null ); } } catch (Exception ex) { throw new Exception( "字段[" + info.Name + "]转换出错," + ex.Message); } } } list.Add(s); } return list; } |
导入Excel方法
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[HttpPost, Route( "api/Workstage/ImportFile" )] public object ImportFile() { var filelist = HttpContext.Current.Request.Files; var models = new List<DModel>(); var path = HttpContext.Current.Server.MapPath( "/ImportConfig/ModelConfig.xml" ); var xr = XMLHelper.ReadToHashtable(path); //读取Excel的字段对应关系,代码的实体字段和Excel中的字段对应,在后面的Excel的值读取还有数据库实体赋值用得到。 try { if (filelist.Count > 0) { for (var i = 0; i < filelist.Count; i++) { var file = filelist[i]; var fileName = file.FileName; var fn = fileName.Split( '\\' ); if (fn.Length > 1) { fileName = fn[fn.Length - 1]; } DataTable dataTable = null ; var fs = fileName.Split( '.' ); if (fs.Length > 1) { dataTable = ExcelHelp.ExcelToTableForXLSX(file.InputStream, xr.ImportHashtable); //excel转成datatable } models = dataTable.ToDataList<DWorkstage>(); //datatable转成list } } var succe = new List<DModel>(); //需要插入的数据列表 var exportList = new List<DModel>(); //需要导出给用户的失败数据列表 // 做一些数据逻辑处理,把处理好的数据加到succe列表中 if (succe.Any()) { SqlBulkCopyHelper.BulkInsertData(succe, "DModel" ); } var url = string .Empty; if (exportList.Any()) { var extDt = exportList.ToDataTable(xr.ExportHashtable); //把数据库中的字段转成Excel中需要展示的字段,并保存到datatable中。 url = SaveFile(extDt, "失败信息.xlsx" ); //把datatable保存到本地服务器或者文件服务器中,然后把文件下载地址返回给前端。 } var list = new { failed = faile.Take(100).ToList(), failedCount = faile.Count }; //数据太多的话,浏览器会崩溃 var json = new { list, msg = "添加成功" , url }; return json; } catch (Exception ex) { var json = new { msg = "添加失败" , ex.Message, ex }; return json; } } |
具体的xml文件
具体的节点可以自己命名。
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<? xml version = "1.0" encoding = "utf-8" ?> < TableConfig > <!--商品名称--> < ColumnName Enabled = "true" > < DbProperty >ProductName</ DbProperty > < ExcelProperty >商品名称</ ExcelProperty > </ ColumnName > <!--原因,导出失败列表时用到的字段,导入时用不到--> < ColumnName Enabled = "true" > < DbProperty >SourceCode</ DbProperty > < ExcelProperty >原因</ ExcelProperty > </ ColumnName > <!--创建时间--> < ColumnName Enabled = "true" > < DbProperty >CreateTime</ DbProperty > < ExcelProperty >创建时间</ ExcelProperty > </ ColumnName > <!--更新时间--> < ColumnName Enabled = "true" > < DbProperty >UpdateTime</ DbProperty > < ExcelProperty >更新时间</ ExcelProperty > </ ColumnName > </ TableConfig > |
具体的Excel模板
以上就是ASP.NET 上传文件导入Excel的示例的详细内容,更多关于ASP.NET 上传文件导入Excel的资料请关注服务器之家其它相关文章!
原文链接:https://www.cnblogs.com/dawenyang/archive/2021/04/12/14647810.html