EPPlus.Core.Extensions 2.4.0

• Converts IEnumerable<T> into an Excel worksheet/package
• Reads data from Excel packages and convert them into a List<T>.

Basic examples:

public class PersonDto
    {      
        [ExcelTableColumn("First name")]
        [Required(ErrorMessage = "First name cannot be empty.")]
        [MaxLength(50, ErrorMessage = "First name cannot be more than {1} characters.")] 
        public string FirstName { get; set; }

        [ExcelTableColumn(columnName = "Last name", isOptional = true)]       
        public string LastName { get; set; }
        
        [ExcelTableColumn(3)]
        [Range(1900, 2050, ErrorMessage = "Please enter a value bigger than {1}")]
        public int YearBorn { get; set; }
        
        public decimal NotMapped { get; set; }

        [ExcelTableColumn(isOptional = true)]
        public decimal OptionalColumn1 { get; set; }

        [ExcelTableColumn(columnIndex=999, isOptional = true)]
        public decimal OptionalColumn2 { get; set; }
    }      

• Converting from Excel to list of objects

    // Direct usage: 
        excelPackage.ToList<PersonDto>(configuration => configuration.SkipCastingErrors());

    // Specific worksheet: 
        excelPackage.GetWorksheet("Persons").ToList<PersonDto>(); 

• From a list of objects to Excel package

    List<PersonDto> persons = new List<PersonDto>();
         
    // Convert list into ExcelPackage
        ExcelPackage excelPackage = persons.ToExcelPackage();

    // Convert list into byte array 
        byte[] excelPackageXlsx = persons.ToXlsx();
       

    // Generate ExcelPackage with configuration

    List<PersonDto> pre50 = persons.Where(x => x.YearBorn < 1950).ToList();
    List<PersonDto> post50 = persons.Where(x => x.YearBorn >= 1950).ToList();
        
    ExcelPackage excelPackage = pre50.ToWorksheet("< 1950")
                             .WithConfiguration(configuration => configuration.WithColumnConfiguration(x => x.AutoFit()))
                             .WithColumn(x => x.FirstName, "First Name")
                             .WithColumn(x => x.LastName, "Last Name")
                             .WithColumn(x => x.YearBorn, "Year of Birth")
                             .WithTitle("< 1950")
                             .NextWorksheet(post50, "> 1950")
                             .WithColumn(x => x.LastName, "Last Name")
                             .WithColumn(x => x.YearBorn, "Year of Birth")
                             .WithTitle("> 1950")
                             .ToExcelPackage(); 

• Generating an Excel template from ExcelWorksheetAttribute marked classes

    [ExcelWorksheet("Stocks")]
    public class StocksDto
    {
        [ExcelTableColumn("SKU")]
        public string Barcode { get; set; }
    
        [ExcelTableColumn]
        public int Quantity { get; set; }
    }   

    // To ExcelPackage
    ExcelPackage excelPackage = Assembly.GetExecutingAssembly().GenerateExcelPackage(nameof(StocksDto));
 
    // To ExcelWorksheet
    using(var excelPackage = new ExcelPackage()){ 
    
        ExcelWorksheet worksheet = excelPackage.GenerateWorksheet(Assembly.GetExecutingAssembly(), nameof(StocksDto));
    
    }