C#封装一个快速读取写入操作excel的工具类
更新时间:2024年01月29日 16:49:14 作者:搬砖的诗人Z
这篇文章主要为大家详细介绍了C#如何封装一个快速读取写入操作excel的工具类,文中的示例代码讲解详细,感兴趣的小伙伴可以跟随小编一起学习一下
这里封装了3个实用类ExcelDataReaderExtensions,ExcelDataSetConfiguration,ExcelDataTableConfiguration和一个实用代码参考:
using ExcelDataReader; using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace ExeclHelper { /// <summary> /// Processing configuration options and callbacks for AsDataTable(). /// </summary> public class ExcelDataTableConfiguration { /// <summary> /// Gets or sets a value indicating the prefix of generated column names. /// </summary> public string EmptyColumnNamePrefix { get; set; } = "Column"; /// <summary> /// Gets or sets a value indicating whether to use a row from the data as column names. /// </summary> public bool UseHeaderRow { get; set; } = false; /// <summary> /// Gets or sets a callback to determine which row is the header row. Only called when UseHeaderRow = true. /// </summary> public Action<IExcelDataReader> ReadHeaderRow { get; set; } /// <summary> /// Gets or sets a callback to determine whether to include the current row in the DataTable. /// </summary> public Func<IExcelDataReader, bool> FilterRow { get; set; } /// <summary> /// Gets or sets a callback to determine whether to include the specific column in the DataTable. Called once per column after reading the headers. /// </summary> public Func<IExcelDataReader, int, bool> FilterColumn { get; set; } } }
using ExcelDataReader; using System; using System.Collections.Generic; using System.Data; using System.Linq; using System.Text; using System.Threading.Tasks; namespace ExeclHelper { /// <summary> /// ExcelDataReader DataSet extensions /// </summary> public static class ExcelDataReaderExtensions { /// <summary> /// Converts all sheets to a DataSet /// </summary> /// <param name="self">The IExcelDataReader instance</param> /// <param name="configuration">An optional configuration object to modify the behavior of the conversion</param> /// <returns>A dataset with all workbook contents</returns> public static DataSet AsDataSet(this IExcelDataReader self, ExcelDataSetConfiguration configuration = null) { if (configuration == null) { configuration = new ExcelDataSetConfiguration(); } self.Reset(); var tableIndex = -1; var result = new DataSet(); do { tableIndex++; if (configuration.FilterSheet != null && !configuration.FilterSheet(self, tableIndex)) { continue; } var tableConfiguration = configuration.ConfigureDataTable != null ? configuration.ConfigureDataTable(self) : null; if (tableConfiguration == null) { tableConfiguration = new ExcelDataTableConfiguration(); } var table = AsDataTable(self, tableConfiguration); result.Tables.Add(table); } while (self.NextResult()); result.AcceptChanges(); if (configuration.UseColumnDataType) { FixDataTypes(result); } self.Reset(); return result; } private static string GetUniqueColumnName(DataTable table, string name) { var columnName = name; var i = 1; while (table.Columns[columnName] != null) { columnName = string.Format("{0}_{1}", name, i); i++; } return columnName; } private static DataTable AsDataTable(IExcelDataReader self, ExcelDataTableConfiguration configuration) { var result = new DataTable { TableName = self.Name }; result.ExtendedProperties.Add("visiblestate", self.VisibleState); var first = true; var emptyRows = 0; var columnIndices = new List<int>(); while (self.Read()) { if (first) { if (configuration.UseHeaderRow && configuration.ReadHeaderRow != null) { configuration.ReadHeaderRow(self); } for (var i = 0; i < self.FieldCount; i++) { if (configuration.FilterColumn != null && !configuration.FilterColumn(self, i)) { continue; } var name = configuration.UseHeaderRow ? Convert.ToString(self.GetValue(i)) : null; if (string.IsNullOrEmpty(name)) { name = configuration.EmptyColumnNamePrefix + i; } // if a column already exists with the name append _i to the duplicates var columnName = GetUniqueColumnName(result, name); var column = new DataColumn(columnName, typeof(object)) { Caption = name }; result.Columns.Add(column); columnIndices.Add(i); } result.BeginLoadData(); first = false; if (configuration.UseHeaderRow) { continue; } } if (configuration.FilterRow != null && !configuration.FilterRow(self)) { continue; } if (IsEmptyRow(self)) { emptyRows++; continue; } for (var i = 0; i < emptyRows; i++) { result.Rows.Add(result.NewRow()); } emptyRows = 0; var row = result.NewRow(); for (var i = 0; i < columnIndices.Count; i++) { var columnIndex = columnIndices[i]; var value = self.GetValue(columnIndex); row[i] = value; } result.Rows.Add(row); } result.EndLoadData(); return result; } private static bool IsEmptyRow(IExcelDataReader reader) { for (var i = 0; i < reader.FieldCount; i++) { if (reader.GetValue(i) != null) return false; } return true; } private static void FixDataTypes(DataSet dataset) { var tables = new List<DataTable>(dataset.Tables.Count); bool convert = false; foreach (DataTable table in dataset.Tables) { if (table.Rows.Count == 0) { tables.Add(table); continue; } DataTable newTable = null; for (int i = 0; i < table.Columns.Count; i++) { Type type = null; foreach (DataRow row in table.Rows) { if (row.IsNull(i)) continue; var curType = row[i].GetType(); if (curType != type) { if (type == null) { type = curType; } else { type = null; break; } } } if (type == null) continue; convert = true; if (newTable == null) newTable = table.Clone(); newTable.Columns[i].DataType = type; } if (newTable != null) { newTable.BeginLoadData(); foreach (DataRow row in table.Rows) { newTable.ImportRow(row); } newTable.EndLoadData(); tables.Add(newTable); } else { tables.Add(table); } } if (convert) { dataset.Tables.Clear(); dataset.Tables.AddRange(tables.ToArray()); } } } }
using ExcelDataReader; using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace ExeclHelper { /// <summary> /// Processing configuration options and callbacks for IExcelDataReader.AsDataSet(). /// </summary> public class ExcelDataSetConfiguration { /// <summary> /// Gets or sets a value indicating whether to set the DataColumn.DataType property in a second pass. /// </summary> public bool UseColumnDataType { get; set; } = true; /// <summary> /// Gets or sets a callback to obtain configuration options for a DataTable. /// </summary> public Func<IExcelDataReader, ExcelDataTableConfiguration> ConfigureDataTable { get; set; } /// <summary> /// Gets or sets a callback to determine whether to include the current sheet in the DataSet. Called once per sheet before ConfigureDataTable. /// </summary> public Func<IExcelDataReader, int, bool> FilterSheet { get; set; } } }
运用实例:
private IList<string> GetTablenames(DataTableCollection tables) { var tableList = new List<string>(); foreach (var table in tables) { tableList.Add(table.ToString()); } return tableList; } public void ExportExcel() { try { //创建一个工作簿 IWorkbook workbook = new HSSFWorkbook(); //创建一个 sheet 表 ISheet sheet = workbook.CreateSheet("合并数据"); //创建一行 IRow rowH = sheet.CreateRow(0); //创建一个单元格 ICell cell = null; //创建单元格样式 ICellStyle cellStyle = workbook.CreateCellStyle(); //创建格式 IDataFormat dataFormat = workbook.CreateDataFormat(); //设置为文本格式,也可以为 text,即 dataFormat.GetFormat("text"); cellStyle.DataFormat = dataFormat.GetFormat("@"); //设置列名 //foreach (DataColumn col in dt.Columns) //{ // //创建单元格并设置单元格内容 // rowH.CreateCell(col.Ordinal).SetCellValue(col.Caption); // //设置单元格格式 // rowH.Cells[col.Ordinal].CellStyle = cellStyle; //} for (int i = 0; i < Headers.Count(); i++) { rowH.CreateCell(i).SetCellValue(Headers[i]); rowH.Cells[i].CellStyle = cellStyle; } //写入数据 for (int i = 0; i < dataModels.Count; i++) { //跳过第一行,第一行为列名 IRow row = sheet.CreateRow(i + 1); for (int j = 0; j < 11; j++) { cell = row.CreateCell(j); if (j == 0) cell.SetCellValue(dataModels[i].title1.ToString()); if (j == 1) cell.SetCellValue(dataModels[i].title2.ToString()); if (j == 2) cell.SetCellValue(dataModels[i].title3.ToString()); if (j == 3) cell.SetCellValue(dataModels[i].title4.ToString()); if (j == 4) cell.SetCellValue(dataModels[i].title5.ToString()); if (j == 5) cell.SetCellValue(dataModels[i].title6.ToString()); if (j == 6) cell.SetCellValue(dataModels[i].title7.ToString()); if (j == 7) cell.SetCellValue(dataModels[i].title8.ToString()); if (j == 8) cell.SetCellValue(dataModels[i].title9.ToString()); if (j == 9) cell.SetCellValue(dataModels[i].title10.ToString()); if (j == 10) cell.SetCellValue(dataModels[i].title11.ToString()); cell.CellStyle = cellStyle; } } //设置导出文件路径 string path = textBox2.Text; //设置新建文件路径及名称 string savePath = path + "合并" + DateTime.Now.ToString("yyyy_MM_dd_HH_mm_ss") + ".xls"; //创建文件 FileStream file = new FileStream(savePath, FileMode.CreateNew, FileAccess.Write); //创建一个 IO 流 MemoryStream ms = new MemoryStream(); //写入到流 workbook.Write(ms); //转换为字节数组 byte[] bytes = ms.ToArray(); file.Write(bytes, 0, bytes.Length); file.Flush(); //还可以调用下面的方法,把流输出到浏览器下载 //OutputClient(bytes); //释放资源 bytes = null; ms.Close(); ms.Dispose(); file.Close(); file.Dispose(); workbook.Close(); sheet = null; workbook = null; } catch (Exception ex) { } }
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