Dengan menggunakan EPPlus, saya ingin membaca tabel excel, lalu menyimpan semua konten dari setiap kolom ke dalam Daftar
yang sesuai. Saya ingin ia mengenali judul tabel dan mengkategorikan isinya berdasarkan itu.
Sebagai contoh, jika tabel excel saya seperti di bawah ini:
Id Name Gender
1 John Male
2 Maria Female
3 Daniel Unknown
Saya ingin datanya disimpan dalam List<ExcelData>
di mana
public class ExcelData
{
public string Id { get; set; }
public string Name { get; set; }
public string Gender { get; set; }
}
Sehingga saya bisa memanggil isinya menggunakan nama heading. Sebagai contoh, ketika saya melakukan ini:
foreach (var data in ThatList)
{
Console.WriteLine(data.Id + data.Name + data.Gender);
}
Ini akan memberi saya output ini:
1JohnMale
2MariaFemale
3DanielUnknown
Hanya ini yang saya dapatkan:
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
Mohon bantuannya :( Saya telah menghabiskan waktu berjam-jam mencari contoh kode mengenai hal ini sehingga saya dapat belajar darinya tetapi tidak berhasil. Saya juga mengerti ExcelToLinQ berhasil melakukan hal itu tetapi tidak dapat mengenali tabel.
Tidak ada yang asli tetapi bagaimana jika Anda menggunakan apa yang saya masukkan ke dalam posting ini:
https://stackoverflow.com/questions/33436525/how-to-parse-excel-rows-back-to-types-using-epplus
Jika Anda ingin mengarahkannya ke tabel saja, maka perlu dimodifikasi. Sesuatu seperti ini harus melakukannya:
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 start = table.Address.Start;
var end = table.Address.End;
var cells = new List<ExcelRangeBase>();
//Have to use for loops insteadof worksheet.Cells to protect against empties
for (var r = start.Row; r <= end.Row; r++)
for (var c = start.Column; c <= end.Column; c++)
cells.Add(table.WorkSheet.Cells[r, c]);
var groups = cells
.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))
{
if (!string.IsNullOrWhiteSpace(val?.ToString()))
{
//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;
}
Berikut ini adalah metode pengujian:
[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();
}
}
Memberikan ini di konsol:
1JohnMale
2MariaFemale
3DanielUnknown
Berhati-hatilah jika field Id Anda adalah angka atau string di excel karena kelasnya mengharapkan string.
Ini adalah versi kerja saya. Perhatikan bahwa kode resolver tidak ditampilkan tetapi merupakan putaran pada implementasi saya yang memungkinkan kolom diselesaikan meskipun mereka diberi nama sedikit berbeda di setiap lembar kerja.
public static IEnumerable<T> ToArray<T>(this ExcelWorksheet worksheet, List<PropertyNameResolver> resolvers) where T : new()
{
// List of all the column names
var header = worksheet.Cells.GroupBy(cell => cell.Start.Row).First();
// Get the properties from the type your are populating
var properties = typeof(T).GetProperties().ToList();
var start = worksheet.Dimension.Start;
var end = worksheet.Dimension.End;
// Resulting list
var list = new List<T>();
// Iterate the rows starting at row 2 (ie start.Row + 1)
for (int row = start.Row + 1; row <= end.Row; row++)
{
var instance = new T();
for (int col = start.Column; col <= end.Column; col++)
{
object value = worksheet.Cells[row, col].Text;
// Get the column name zero based (ie col -1)
var column = (string)header.Skip(col - 1).First().Value;
// Gets the corresponding property to set
var property = properties.Property(resolvers, column);
try
{
var propertyName = property.PropertyType.IsGenericType
? property.PropertyType.GetGenericArguments().First().FullName
: property.PropertyType.FullName;
// Implement setter code as needed.
switch (propertyName)
{
case "System.String":
property.SetValue(instance, Convert.ToString(value));
break;
case "System.Int32":
property.SetValue(instance, Convert.ToInt32(value));
break;
case "System.DateTime":
if (DateTime.TryParse((string) value, out var date))
{
property.SetValue(instance, date);
}
property.SetValue(instance, FromExcelSerialDate(Convert.ToInt32(value)));
break;
case "System.Boolean":
property.SetValue(instance, (int)value == 1);
break;
}
}
catch (Exception e)
{
// instance property is empty because there was a problem.
}
}
list.Add(instance);
}
return list;
}
// Utility function taken from the above post's inline function.
public static DateTime FromExcelSerialDate(int 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);
}
Kode di bawah ini akan membaca data excel ke dalam datatable, yang dikonversi menjadi daftar datarows.
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();
}
}