NPOI extensions for target framework net45 and netstandard2.0.

There' a lot of userful extensions for you, core fetures are as follows:

• mapping a excel file data to a DataTable or List<TEntity>
• export IEnumerable<TEntity> or DataTable data to Excel file or Excel file bytes or even write excel file stream to your stream
• export IEnumerable<TEntity> or DataTable data to csv file or bytes.
• custom configuration/mappings by Attribute or FluentAPI(inspired by FluentExcel)

.NetFramework

Install-Package WeihanLi.Npoi

.NetCore

dotnet add package WeihanLi.Npoi

1. LoadFromExcelFile

   it consider the first row of the sheet as the header, not for read,it will read data from next row. You can point out your header row through the exposed api if needed.

   • Read Excel to DataSet

     // read excel to dataSet, read all sheets data to dataSet,by default it will read from the headerRowIndex(0) + 1
     var dataSet = ExcelHelper.ToDataSet(string excelPath);
     
     // read excel to dataSet, read all sheets data to dataSet,headerRowIndex is not for read,read from headerRowIndex+1
     var dataSet = ExcelHelper.ToDataSet(string excelPath, int headerRowIndex);

   • Read Excel to DataTable

     // read excel to dataTable directly,by default read the first sheet content
     var dataTable = ExcelHelper.ToDataTable(string excelPath);
     
     // read excel workbook's sheetIndex sheet to dataTable directly
     var dataTableOfSheetIndex = ExcelHelper.ToDataTable(string excelPath, int sheetIndex);
     
     // read excel workbook's sheetIndex sheet to dataTable,custom headerRowIndex
     var dataTableOfSheetIndex = ExcelHelper.ToDataTable(string excelPath, int sheetIndex, int headerRowIndex);
     
     // read excel to dataTable use mapping relations and settings from typeof(T),by default read the first sheet content
     var dataTableT = ExcelHelper.ToDataTable<T>(string excelPath);
     
     // ... sheetIndex and headerRowIndex is also supported like above

   • Read Excel to List

     // read excel first sheet content to a List<T>
     var entityList = ExcelHelper.ToEntityList<T>(string excelPath);
     
     // read excel sheetIndex sheet content to a List<T>
     // you can custom header row index via sheet attribute or fluent api HasSheet
     var entityList1 = ExcelHelper.ToEntityList<T>(string excelPath, int sheetIndex);

2. Get a workbook

   // load excel workbook from file
   var workbook = LoadExcel(string excelPath);
   
   // prepare a workbook accounting to excelPath
   var workbook = PrepareWorkbook(string excelPath);
   
   // prepare a workbook accounting to excelPath and custom excel settings
   var workbook = PrepareWorkbook(string excelPath, ExcelSetting excelSetting);
   
   // prepare a workbook whether *.xlsx file
   var workbook = PrepareWorkbook(bool isXlsx);
   
   // prepare a workbook whether *.xlsx file and custom excel setting
   var workbook = PrepareWorkbook(bool isXlsx, ExcelSetting excelSetting);

3. Rich extensions

   List<TEntity> ToEntityList<TEntity>([NotNull]this IWorkbook workbook)
   
   DataTable ToDataTable([NotNull]this IWorkbook workbook)
   
   ISheet ImportData<TEntity>([NotNull] this ISheet sheet, DataTable dataTable)
   
   int ImportData<TEntity>([NotNull] this IWorkbook workbook, IEnumerable<TEntity> list,
               int sheetIndex)
   
   int ImportData<TEntity>([NotNull] this ISheet sheet, IEnumerable<TEntity> list)
   
   int ImportData<TEntity>([NotNull] this IWorkbook workbook, [NotNull] DataTable dataTable,
               int sheetIndex)
   
   ToExcelFile<TEntity>([NotNull] this IEnumerable<TEntity> entityList,
               [NotNull] string excelPath)
   
   int ToExcelStream<TEntity>([NotNull] this IEnumerable<TEntity> entityList,
               [NotNull] Stream stream)
   
   byte[] ToExcelBytes<TEntity>([NotNull] this IEnumerable<TEntity> entityList)
   
   int ToExcelFile([NotNull] this DataTable dataTable, [NotNull] string excelPath)
   
   int ToExcelStream([NotNull] this DataTable dataTable, [NotNull] Stream stream)
   
   byte[] ToExcelBytes([NotNull] this DataTable dataTable)
   
   byte[] ToExcelBytes([NotNull] this IWorkbook workbook)
   
   int WriteToFile([NotNull] this IWorkbook workbook, string filePath)
   
   object GetCellValue([NotNull] this ICell cell, Type propertyType)
   
   T GetCellValue<T>([NotNull] this ICell cell)
   
   void SetCellValue([NotNull] this ICell cell, object value)
   
   byte[] ToCsvBytes<TEntity>(this IEnumerable<TEntity> entities, bool includeHeader)
   
   ToCsvFile<TEntity>(this IEnumerable<TEntity> entities, string filePath, bool includeHeader)
   
   void ToCsvFile(this DataTable dt, string filePath, bool includeHeader)
   
   byte[] ToCsvBytes(this DataTable dt, bool includeHeader)

1. Attributes

   Add ColumnAttribute on the property of the entity which you used for export or import

   Add SheetAttribute on the entity which you used for export or import,you can set the StartRowIndex on your need(by default it is 1)

   for example:

   public class TestEntity
   {
       [Column("Id")]
       public int PKID { get; set; }
   
       [Column("Bill Title")]
       public string BillTitle { get; set; }
   
       [Column("Bill Details")]
       public string BillDetails { get; set; }
   
       [Column("CreatedBy")]
       public string CreatedBy { get; set; }
   
       [Column("CreatedTime")]
       public DateTime CreatedTime { get; set; }
   }
   
   public class TestEntity1
   {
       [Column("Username")]
       public string Username { get; set; }
   
       [Column(IsIgnored = true)]
       public string PasswordHash { get; set; }
   
       [Column("Amount")]
       public decimal Amount { get; set; } = 1000M;
   
       [Column("WechatOpenId")]
       public string WechatOpenId { get; set; }
   
       [Column("IsActive")]
       public bool IsActive { get; set; }
   }

2. FluentApi (Recommend)

   You can use FluentApi also

   for example:

   var setting = ExcelHelper.SettingFor<TestEntity>();
   // ExcelSetting
   setting.HasAuthor("WeihanLi")
       .HasTitle("WeihanLi.Npoi test")
       .HasDescription("")
       .HasSubject("");
   
   setting.HasSheetConfiguration(0, "System Settings");
   
   setting.HasFilter(0, 1)
       .HasFreezePane(0, 1, 2, 1);
   setting.Property(_ => _.SettingId)
       .HasColumnIndex(0);
   
   setting.Property(_ => _.SettingName)
       .HasColumnTitle("SettingName")
       .HasColumnIndex(1);
   
   setting.Property(_ => _.DisplayName)
       .HasColumnFormatter((entity, displayName) => $"AAA_{entity.SettingName}_{displayName}")
       .HasColumnTitle("DisplayName")
       .HasColumnIndex(2);
   
   setting.Property(_ => _.SettingValue)
       .HasColumnTitle("SettingValue")
       .HasColumnIndex(3);
   
   setting.Property(_ => _.CreatedTime)
       .HasColumnTitle("CreatedTime")
       .HasColumnIndex(5)
       .HasColumnFormatter("yyyy-MM-dd HH:mm:ss");
   
   setting.Property(_ => _.CreatedBy)
       .HasColumnIndex(4)
       .HasColumnTitle("CreatedBy");
   
   setting.Property(_ => _.UpdatedBy).Ignored();
   setting.Property(_ => _.UpdatedTime).Ignored();
   setting.Property(_ => _.PKID).Ignored();

• dotnetcore sample
• dotnet sample

Contact me: weihanli@outlook.com