final update

Author: Clouz

ExcelInterface/excelinterface.cs

@@ -10,50 +10,51 @@ namespace ExcelWs
 {
     public static class Interface
     {
-        public static int RowCount { get; private set; }
-        public static int ColCount { get; private set; }
-
-        public static Stopwatch ExcelGetTime { get; private set; } = new Stopwatch();
+        /// <summary>
+        /// Time to perform SetExcel operation
+        /// </summary>
         public static Stopwatch ExcelSetTime { get; private set; } = new Stopwatch();
 
-        public static IEnumerable<List<dynamic>> GetExcelRowEnumerator(int sheetNumber, string path)
+        /// <summary>
+        /// Get Excel to List
+        /// </summary>
+        /// <param name="sheetNumber">Sheet number start from 1</param>
+        /// <param name="path">Path of excel file</param>
+        /// <param name="RowStart">Optional Row</param>
+        /// <returns>List of Excel data</returns>
+        public static IEnumerable<List<dynamic>> GetExcelRowEnumerator(int sheetNumber, string path, int RowStart = 1)
         {
-            //Start timer
-            ExcelGetTime.Start();
-
             Excel.Application excelApp = new Excel.Application();
             Excel.Workbook workbook = excelApp.Workbooks.Open(path, ReadOnly: true);
 
             //seleziono la scheda
             Excel._Worksheet worksheet = (Excel._Worksheet)workbook.Sheets[sheetNumber];
             Excel.Range range = worksheet.UsedRange;
 
-            RowCount = range.Rows.Count;
-            ColCount = range.Columns.Count;
-
             // Array che conterrà il foglio excel completo
             object[,] valueArray = null;
-
             valueArray = range.get_Value(Excel.XlRangeValueDataType.xlRangeValueDefault);
 
-            // build and yield each row at a time
-            for (int rowIndex = 1; rowIndex <= valueArray.GetLength(0); rowIndex++)
+            // Costruisco e yield ogni riga
+            for (int rowIndex = RowStart; rowIndex <= valueArray.GetLength(0); rowIndex++)
             {
                 List<dynamic> row = new List<dynamic>(valueArray.GetLength(1));
-                // build a list of column values for the row
+
                 for (int colIndex = 1; colIndex <= valueArray.GetLength(1); colIndex++)
                 {
                     row.Add(valueArray[rowIndex, colIndex]);
                 }
                 yield return row;
             }
-
             workbook.Close();
-
-            //stop timer
-            ExcelGetTime.Stop();
         }
 
+
+        /// <summary>
+        /// List to Excel
+        /// </summary>
+        /// <typeparam name="T">Class representing data model</typeparam>
+        /// <param name="data">List of data</param>
         public static void SetExcelRow<T>(List<T> data)
         {
             try
@@ -71,8 +72,7 @@ public static void SetExcelRow<T>(List<T> data)
 
                 //scrivo l'intestazione
                 Excel.Range head = workSheet.Range[workSheet.Cells[1, 1], workSheet.Cells[1, collumn]];
-                var prova = ListToArray(prop.Select(x => x.Name).ToList());
-                head.Value2 = prova;
+                head.Value2 = ListToArray(prop.Select(x => x.Name).ToList());
 
                 //scrivo il contenuto
                 Excel.Range body = workSheet.Range[workSheet.Cells[2, 1], workSheet.Cells[row, collumn]];
@@ -88,28 +88,35 @@ public static void SetExcelRow<T>(List<T> data)
 
                 //stop timer
                 ExcelSetTime.Stop();
-
             }
             catch (Exception ex)
             {
                 Console.WriteLine(ex.ToString());
             }
         }
 
-        static public string[,] ListToArray(List<string> list)
+        /// <summary>
+        /// List to multidimensional Array
+        /// </summary>
+        /// <param name="list">Rappresent Data</param>
+        /// <returns></returns>
+        static private string[,] ListToArray(List<string> list)
         {
-
             string[,] elements = new string[1, list.Count()];
 
             for (int i = 0; i < list.Count(); i++)
-            {
                 elements[0, i] = list.ElementAt(i);
-            }
 
             return elements;
         }
 
-        static public string[,] ListToArray<T>(List<T> list)
+        /// <summary>
+        /// List<T> to multidimensional Array
+        /// </summary>
+        /// <typeparam name="T">Model Class</typeparam>
+        /// <param name="list">Rappresent Data</param>
+        /// <returns></returns>
+        static private string[,] ListToArray<T>(List<T> list)
         {
             var props = typeof(T).GetProperties();
 
@@ -124,7 +131,6 @@ public static void SetExcelRow<T>(List<T> data)
                     ii++;
                 }
             }
-
             return elements;
         }
     }

Test/Program.cs

@@ -12,30 +12,28 @@ class Program
     {
         static void Main(string[] args)
         {
-            //var x = Interface.GetExcelRowEnumerator(1, args[0]);
+            var x = Interface.GetExcelRowEnumerator(1, args[0]);
 
-            List<Prova> prova = new List<Prova>();
+            List<Prova> lista = new List<Prova>();
 
-            for (int i = 0; i < 500; i++)
+            foreach (var item in x)
             {
-                prova.Add(new Prova {
-                    Nome = $"Claudio {i}",
-                    Cognome = $"Mola {i+i}",
-                    Telefono = i
+                lista.Add(new Prova() {
+                    Nome = item[1],
+                    Telefono = (int)item[0]
                 });
             }
 
-            Interface.SetExcelRow<Prova>(prova);
+            Interface.SetExcelRow<Prova>(lista);
             Console.WriteLine($"Creating time: {Interface.ExcelSetTime.Elapsed}");
-            
+
             Console.ReadLine();
         }
 
 
         public class Prova
         {
             public string Nome { get; set; }
-            public string Cognome { get; set; }
             public int Telefono { get; set; }
         }
     }