using OfficeOpenXml;
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using OfficeOpenXml.Style;
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Data;
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using System.Linq;
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namespace Bro.Process.DBManager
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{
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/// <summary>
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/// Excel导出帮助类
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/// </summary>
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public class ExcelExportHelper
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{
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public static string ExcelContentType => "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
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/// <summary>
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/// List转DataTable
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="data"></param>
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/// <returns></returns>
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public static DataTable ListToDataTable<T>(List<T> data)
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{
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PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(typeof(T));
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DataTable dataTable = new DataTable();
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for (int i = 0; i < properties.Count; i++)
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{
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PropertyDescriptor property = properties[i];
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dataTable.Columns.Add(property.Name, Nullable.GetUnderlyingType(property.PropertyType) ?? property.PropertyType);
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}
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object[] values = new object[properties.Count];
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foreach (T item in data)
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{
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for (int i = 0; i < values.Length; i++)
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{
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values[i] = properties[i].GetValue(item);
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}
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dataTable.Rows.Add(values);
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}
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return dataTable;
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}
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/// <summary>
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/// 导出Excel
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/// </summary>
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/// <param name="dataTable">数据源</param>
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/// <param name="heading">工作簿Worksheet</param>
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/// <param name="showSrNo">//是否显示行编号</param>
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/// <param name="columnsToTake">要导出的列</param>
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/// <returns></returns>
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public static byte[] ExportExcel(DataTable dataTable, string heading = "", bool showSrNo = false, params string[] columnsToTake)
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{
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byte[] result;
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using (ExcelPackage package = new ExcelPackage())
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{
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ExcelWorksheet workSheet = package.Workbook.Worksheets.Add($"{heading}Data");
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int startRowFrom = string.IsNullOrEmpty(heading) ? 1 : 3; //开始的行
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//是否显示行编号
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if (showSrNo)
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{
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DataColumn dataColumn = dataTable.Columns.Add("#", typeof(int));
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dataColumn.SetOrdinal(0);
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int index = 1;
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foreach (DataRow item in dataTable.Rows)
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{
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item[0] = index;
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index++;
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}
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}
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//Add Content Into the Excel File
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workSheet.Cells["A" + startRowFrom].LoadFromDataTable(dataTable, true);
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// autofit width of cells with small content
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int columnIndex = 1;
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foreach (DataColumn item in dataTable.Columns)
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{
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ExcelRange columnCells = workSheet.Cells[workSheet.Dimension.Start.Row, columnIndex, workSheet.Dimension.End.Row, columnIndex];
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int maxLength = columnCells.Max(cell => cell.Value.ToString().Count());
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if (maxLength < 150)
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{
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workSheet.Column(columnIndex).AutoFit();
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}
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columnIndex++;
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}
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// format header - bold, yellow on black
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using (ExcelRange r = workSheet.Cells[startRowFrom, 1, startRowFrom, dataTable.Columns.Count])
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{
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r.Style.Font.Color.SetColor(System.Drawing.Color.White);
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r.Style.Font.Bold = true;
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r.Style.Fill.PatternType = ExcelFillStyle.Solid;
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r.Style.Fill.BackgroundColor.SetColor(System.Drawing.ColorTranslator.FromHtml("#1fb5ad"));
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}
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// format cells - add borders
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using (ExcelRange r = workSheet.Cells[startRowFrom + 1, 1, startRowFrom + dataTable.Rows.Count, dataTable.Columns.Count])
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{
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r.Style.Border.Top.Style = ExcelBorderStyle.Thin;
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r.Style.Border.Bottom.Style = ExcelBorderStyle.Thin;
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r.Style.Border.Left.Style = ExcelBorderStyle.Thin;
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r.Style.Border.Right.Style = ExcelBorderStyle.Thin;
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r.Style.Border.Top.Color.SetColor(System.Drawing.Color.Black);
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r.Style.Border.Bottom.Color.SetColor(System.Drawing.Color.Black);
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r.Style.Border.Left.Color.SetColor(System.Drawing.Color.Black);
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r.Style.Border.Right.Color.SetColor(System.Drawing.Color.Black);
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}
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// removed ignored columns
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for (int i = dataTable.Columns.Count - 1; i >= 0; i--)
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{
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if (i == 0 && showSrNo)
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{
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continue;
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}
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if (!columnsToTake.Contains(dataTable.Columns[i].ColumnName))
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{
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workSheet.DeleteColumn(i + 1);
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}
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}
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if (!string.IsNullOrEmpty(heading))
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{
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workSheet.Cells["A1"].Value = heading;
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workSheet.Cells["A1"].Style.Font.Size = 20;
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workSheet.InsertColumn(1, 1);
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workSheet.InsertRow(1, 1);
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workSheet.Column(1).Width = 5;
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}
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result = package.GetAsByteArray();
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}
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return result;
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}
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/// <summary>
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/// 导出Excel
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="data"></param>
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/// <param name="heading"></param>
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/// <param name="isShowSlNo"></param>
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/// <param name="columnsToTake"></param>
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/// <returns></returns>
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public static byte[] ExportExcel<T>(List<T> data, string heading = "", bool isShowSlNo = false, params string[] columnsToTake)
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{
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return ExportExcel(ListToDataTable(data), heading, isShowSlNo, columnsToTake);
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}
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}
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}
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