Initial

Web/Utility/ExcelWriter.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using ExcelLibrary.SpreadSheet;
+using MileageTraker.Web.Models;
+
+namespace MileageTraker.Web.Utility
+{
+	public static class ExcelWriter
+	{
+		public static void WriteXls<T>(IEnumerable<T> items, string filename, string worksheetTitle, string worksheetName)
+		{
+			using (var fileStream = new FileStream(filename, FileMode.Create))
+				WriteXls(items, fileStream, worksheetTitle, worksheetName);
+		}
+
+		public static byte[] WriteXls<T>(IEnumerable<T> items, string worksheetTitle, string worksheetName)
+		{
+			using (var stream = new MemoryStream())
+			{
+				WriteXls(items, stream, worksheetTitle, worksheetName);
+				return stream.ToArray();
+			}
+		}
+
+		public static void WriteXls<T>(IEnumerable<T> items, Stream stream, string worksheetTitle, string worksheetName)
+		{
+			var workbook = new Workbook();
+			var worksheet = new Worksheet(worksheetName);
+
+			// write worksheet header
+			worksheet.Cells[0, 3] = new Cell(worksheetTitle);
+			
+			// write column headers
+			var properties =
+				typeof(T).GetProperties()
+					.Where(p => !p.PropertyType.IsCollection());
+
+			properties.Zip(
+				CustomExtensions.GetNumbers(), 
+				(p, c) => 
+					worksheet.Cells[2, c] = new Cell(p.GetName())
+				).ToList();
+
+			// write the data
+			items.Zip(
+				CustomExtensions.GetNumbers().Skip(3),
+				(vehicle, r) =>
+					properties.Zip(CustomExtensions.GetNumbers(),
+					(p, c) => {
+						var value = p.GetValue(vehicle);
+						
+						string formatString = null;
+						
+						if (value is decimal) // assume that it's currency
+							formatString = "#,##0.00";
+						
+						if (value is DateTime && p.Name == "Date")
+							formatString = @"YYYY\-MM\-DD";
+						else if (value is DateTime)
+							formatString = @"YYYY\-MM\-DD hh:mm:ss";
+
+						int intValue; // write int-looking values as numbers
+						if (value is string && int.TryParse((string)value, out intValue))
+							value = intValue;
+
+						double doubleValue; // write double-looking values as numbers
+						if (value is string && double.TryParse((string)value, out doubleValue))
+							value = doubleValue;
+
+						if (value is MileageLogTypeWrapper)
+							value = ((MileageLogTypeWrapper) value).Enum.GetDisplayName();
+
+						var cell = formatString != null ? new Cell(value,formatString) : new Cell(value);
+						worksheet.Cells[r, c] = cell;
+						
+						return (string)null;
+					}).ToList()).ToList();
+
+			PadWorksheet(worksheet);
+
+			workbook.Worksheets.Add(worksheet);
+			workbook.Save(stream);
+		}
+
+		private static void PadWorksheet(Worksheet worksheet)
+		{
+			Func<int> totalCells = () => (worksheet.Cells.LastRowIndex + 1)*(worksheet.Cells.LastColIndex + 1);
+			for (var r = worksheet.Cells.LastRowIndex + 1; totalCells() < 320; r++)
+			{
+				for (var c = 0; c < worksheet.Cells.LastColIndex; c++)
+				{
+					worksheet.Cells[r, c] = new Cell("");
+				}
+			}
+		}
+	}
+}