Initiate InventoyTypes from a xlxs

Arrival mostly working

InventoryTraker.Web/Utilities/ExcelParserBase.cs

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+using System;
+using System.IO;
+using CsvHelper;
+using CsvHelper.Configuration;
+using CsvHelper.Excel;
+
+namespace InventoryTraker.Web.Utilities
+{
+	public class ExcelParserBase : IDisposable
+	{
+		protected readonly CsvReader CsvReader;
+
+		protected ExcelParserBase(FileSystemInfo excelFile, CsvConfiguration csvConfiguration)
+		{
+			CsvReader = OpenExcel(excelFile, csvConfiguration);
+		}
+
+		protected ExcelParserBase(FileSystemInfo excelFile) :
+			this(excelFile,
+				new CsvConfiguration
+				{
+					HasHeaderRecord = false,
+					IgnoreBlankLines = false,
+					IgnoreReadingExceptions = true
+				})
+		{
+		}
+
+		internal static CsvReader OpenExcel(FileSystemInfo excelFile, CsvConfiguration csvConfiguration = null)
+		{
+			if (!excelFile.Exists)
+				throw new FileNotFoundException($"Cannot find file '{excelFile.Name}'");
+
+			var excelParser = 
+				csvConfiguration != null 
+				? new ExcelParser(excelFile.FullName, csvConfiguration)
+				: new ExcelParser(excelFile.FullName);
+			return new CsvReader(excelParser);
+		}
+
+		protected string[] GetNextCsvRowValues()
+		{
+			// get values from row
+			if (!CsvReader.Read())
+				return null;
+
+			return CsvReader.CurrentRecord;
+		}
+
+		public void Dispose()
+		{
+			CsvReader.Dispose();
+		}
+	}
+}

InventoryTraker.Web/Utilities/InventoryTypeParser.cs

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+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using ClosedXML.Excel;
+using CsvHelper.Configuration;
+using InventoryTraker.Web.Core;
+
+namespace InventoryTraker.Web.Utilities
+{
+	public class InventoryTypeParser
+	{
+		private readonly FileSystemInfo _excelFile;
+
+		private sealed class InventoryTypeMap : CsvClassMap<InventoryType>
+		{
+			public InventoryTypeMap()
+			{
+				Map(m => m.Identifier);
+				Map(m => m.Name);
+				Map(m => m.UnitsPerCase);
+				Map(m => m.ContainerType);
+				Map(m => m.WeightPerCase);
+				Map(m => m.PricePerCase);
+			}
+		}
+
+		public InventoryTypeParser(FileSystemInfo excelFile)
+		{
+			_excelFile = excelFile;
+		}
+
+		public IList<InventoryType> Parse()
+		{
+			var csvConfiguration = 
+				new CsvConfiguration { IsHeaderCaseSensitive = false, IgnoreReadingExceptions = true};
+			csvConfiguration.RegisterClassMap<InventoryTypeMap>();
+			using (var reader = ExcelParserBase.OpenExcel(_excelFile, csvConfiguration))
+			{
+				return reader.GetRecords<InventoryType>().ToList();
+			}
+		}
+	}
+}