ClosedXML/ClosedXML_Examples/Misc/LambdaExpressions.cs

using System.IO;
using System.Linq;
using ClosedXML.Excel;
using MoreLinq;

namespace ClosedXML_Examples
{
    public class LambdaExpressions : IXLExample
    {
        public void Create(string filePath)
        {

            string tempFile = ExampleHelper.GetTempFilePath(filePath);
            try
            {
                new BasicTable().Create(tempFile);
                var workbook = new XLWorkbook(tempFile);
                var ws = workbook.Worksheet(1);

                // Define a range with the data
                var firstDataCell = ws.Cell("B4");
                var lastDataCell = ws.LastCellUsed();
                var rngData = ws.Range(firstDataCell.Address, lastDataCell.Address);

                // Delete all rows where Outcast = false (the 3rd column)
                rngData.Rows() // From all rows
                        .Where(r => !r.Cell(3).GetBoolean()) // where the 3rd cell of each row is false
                        .ForEach(r => r.Delete()); // delete the row and shift the cells up (the default for rows in a range)

                //// Put a light gray background to all text cells
                //rngData.Cells() // From all cells
                //        .Where(c => c.DataType == XLCellValues.Text) // where the data type is Text
                //        .ForEach(c => c.Style.Fill.BackgroundColor = XLColor.LightGray); // Fill with a light gray

                var cells = rngData.Cells();
                var filtered = cells.Where(c => c.DataType == XLDataType.Text);
                var list = filtered.ToList();
                foreach (var c in list)
                {
                    c.Style.Fill.BackgroundColor = XLColor.LightGray;
                }

                // Put a thick border to the bottom of the table (we may have deleted the bottom cells with the border)
                rngData.LastRow().Style.Border.BottomBorder = XLBorderStyleValues.Thick;

                workbook.SaveAs(filePath);
            }
            finally
            {
                if (File.Exists(tempFile))
                {
                    File.Delete(tempFile);
                }
            }
        }
    }
}