EPPlus – 读取Excel表格
使用EPPlus，我想读取一个Excel表格，然后将每一列中的所有内容存储到相应的List 。 我希望它能够识别表格的标题，并根据这些内容对内容进行分类。
例如，如果我的Excel表格如下所示：
Id Name Gender 1 John Male 2 Maria Female 3 Daniel Unknown
我希望数据存储在List<ExcelData>中
public class ExcelData { public string Id { get; set; } public string Name { get; set; } public string Gender { get; set; } }
这样我可以使用标题名称调出内容。 例如，当我这样做：
foreach (var data in ThatList) { Console.WriteLine(data.Id + data.Name + data.Gender); }
它会给我这个输出：
1JohnMale 2MariaFemale 3DanielUnknown
这是我得到的全部：
var package = new ExcelPackage(new FileInfo(@"C:\ExcelFile.xlsx")); ExcelWorksheet sheet = package.Workbook.Worksheets[1]; var table = sheet.Tables.First(); table.Columns.Something //I guess I can use this to do what I want
请帮忙:(我已经花了很长时间寻找关于这个示例代码，以便我可以从中学习，但无济于事。我也理解ExcelToLinQ被设法做到这一点，但它不能识别表。
没有本地的，但如果你使用我在这篇文章中的内容：
如何将Excel行parsing回使用EPPlus的types
如果您只想将其指向某个表格，则需要对其进行修改。 像这样的东西应该这样做：
public static IEnumerable<T> ConvertTableToObjects<T>(this ExcelTable table) where T : new() { //DateTime Conversion var convertDateTime = new Func<double, DateTime>(excelDate => { if (excelDate < 1) throw new ArgumentException("Excel dates cannot be smaller than 0."); var dateOfReference = new DateTime(1900, 1, 1); if (excelDate > 60d) excelDate = excelDate - 2; else excelDate = excelDate - 1; return dateOfReference.AddDays(excelDate); }); //Get the properties of T var tprops = (new T()) .GetType() .GetProperties() .ToList(); //Get the cells based on the table address var groups = table.WorkSheet.Cells[table.Address.Start.Row, table.Address.Start.Column, table.Address.End.Row, table.Address.End.Column] .GroupBy(cell => cell.Start.Row) .ToList(); //Assume the second row represents column data types (big assumption!) var types = groups .Skip(1) .First() .Select(rcell => rcell.Value.GetType()) .ToList(); //Assume first row has the column names var colnames = groups .First() .Select((hcell, idx) => new { Name = hcell.Value.ToString(), index = idx }) .Where(o => tprops.Select(p => p.Name).Contains(o.Name)) .ToList(); //Everything after the header is data var rowvalues = groups .Skip(1) //Exclude header .Select(cg => cg.Select(c => c.Value).ToList()); //Create the collection container var collection = rowvalues .Select(row => { var tnew = new T(); colnames.ForEach(colname => { //This is the real wrinkle to using reflection - Excel stores all numbers as double including int var val = row[colname.index]; var type = types[colname.index]; var prop = tprops.First(p => p.Name == colname.Name); //If it is numeric it is a double since that is how excel stores all numbers if (type == typeof(double)) { //Unbox it var unboxedVal = (double)val; //FAR FROM A COMPLETE LIST!!! if (prop.PropertyType == typeof(Int32)) prop.SetValue(tnew, (int)unboxedVal); else if (prop.PropertyType == typeof(double)) prop.SetValue(tnew, unboxedVal); else if (prop.PropertyType == typeof(DateTime)) prop.SetValue(tnew, convertDateTime(unboxedVal)); else throw new NotImplementedException(String.Format("Type '{0}' not implemented yet!", prop.PropertyType.Name)); } else { //Its a string prop.SetValue(tnew, val); } }); return tnew; }); //Send it back return collection; }
这里是一个testing方法：
[TestMethod] public void Table_To_Object_Test() { //Create a test file var fi = new FileInfo(@"c:\temp\Table_To_Object.xlsx"); using (var package = new ExcelPackage(fi)) { var workbook = package.Workbook; var worksheet = workbook.Worksheets.First(); var ThatList = worksheet.Tables.First().ConvertTableToObjects<ExcelData>(); foreach (var data in ThatList) { Console.WriteLine(data.Id + data.Name + data.Gender); } package.Save(); } }
在控制台中给出这个：
1JohnMale 2MariaFemale 3DanielUnknown
只要小心，如果你的字段是一个数字或string在Excel中，因为类正在期待一个string。
下面的代码将读取excel数据到一个datatable，它被转换成数据行列表。
if (FileUpload1.HasFile) { if (Path.GetExtension(FileUpload1.FileName) == ".xlsx") { Stream fs = FileUpload1.FileContent; ExcelPackage package = new ExcelPackage(fs); DataTable dt = new DataTable(); dt= package.ToDataTable(); List<DataRow> listOfRows = new List<DataRow>(); listOfRows = dt.AsEnumerable().ToList(); } }