Initial commit of the ClosedXML library

Establishes the foundational structure, core Excel functionality, and tooling.

- Implements base components for cells, ranges, columns, and rows.
- Integrates a custom calculation engine with a wide range of Excel functions.
- Adds comprehensive support for styling, conditional formatting, data validation, comments, pictures, and charts.
- Configures build setup, project metadata (NuGet), and developer guidelines.
- Includes editor and Git attributes for consistent code style and line endings.

ClosedXML_Examples/Rows/InsertRows.cs

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+using System;
+using System.Linq;
+using ClosedXML.Excel;
+
+
+namespace ClosedXML_Examples.Rows
+{
+    public class InsertRows : IXLExample
+    {
+        #region Variables
+
+        // Public
+
+        // Private
+
+
+        #endregion
+
+        #region Properties
+
+        // Public
+
+        // Private
+
+        // Override
+
+
+        #endregion
+
+        #region Events
+
+        // Public
+
+        // Private
+
+        // Override
+
+
+        #endregion
+
+        #region Methods
+
+        // Public
+        public void Create(String filePath)
+        {
+            var workbook = new XLWorkbook();
+            var ws = workbook.Worksheets.Add("Inserting Rows");
+
+            // Color the entire spreadsheet using rows
+            ws.Rows().Style.Fill.BackgroundColor = XLColor.LightCyan;
+
+            // Put a value in a few cells
+            foreach (var r in Enumerable.Range(1, 5))
+                foreach (var c in Enumerable.Range(1, 5))
+                    ws.Cell(r, c).Value = "X";
+
+            var blueRow = ws.Row(2);
+            var redRow = ws.Row(5);
+
+            blueRow.Style.Fill.BackgroundColor = XLColor.Blue;
+            blueRow.InsertRowsBelow(2);
+
+
+            redRow.Style.Fill.BackgroundColor = XLColor.Red;
+            redRow.InsertRowsAbove(2);
+
+            ws.Columns(3, 4).Style.Fill.BackgroundColor = XLColor.Orange;
+            ws.Range("A2:A4").InsertRowsBelow(2);
+            ws.Range("B2:B4").InsertRowsAbove(2);
+            ws.Range("C2:C4").InsertRowsBelow(2);
+            ws.Range("D2:D4").InsertRowsAbove(2);
+
+            workbook.SaveAs(filePath);
+        }
+
+        // Private
+
+        // Override
+
+
+        #endregion
+    }
+}

ClosedXML_Examples/Rows/RowCells.cs

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+using System;
+using ClosedXML.Excel;
+
+
+namespace ClosedXML_Examples
+{
+    public class RowCells : IXLExample
+    {
+        #region Variables
+
+        // Public
+
+        // Private
+
+
+        #endregion
+
+        #region Properties
+
+        // Public
+
+        // Private
+
+        // Override
+
+
+        #endregion
+
+        #region Events
+
+        // Public
+
+        // Private
+
+        // Override
+
+
+        #endregion
+
+        #region Methods
+
+        // Public
+        public void Create(String filePath)
+        {
+            var workbook = new XLWorkbook();
+            var ws = workbook.Worksheets.Add("Row Cells");
+
+            var rowFromWorksheet = ws.Row(1);
+            rowFromWorksheet.Cell(1).Style.Fill.BackgroundColor = XLColor.Red;
+            rowFromWorksheet.Cells("2").Style.Fill.BackgroundColor = XLColor.Blue;
+            rowFromWorksheet.Cells("3,5:6").Style.Fill.BackgroundColor = XLColor.Red;
+            rowFromWorksheet.Cells(8, 9).Style.Fill.BackgroundColor = XLColor.Blue;
+
+            var rowFromRange = ws.Range("A2:I2").FirstRow();
+
+            rowFromRange.Cell(1).Style.Fill.BackgroundColor = XLColor.Red;
+            rowFromRange.Cells("2").Style.Fill.BackgroundColor = XLColor.Blue;
+            rowFromRange.Cells("3,5:6").Style.Fill.BackgroundColor = XLColor.Red;
+            rowFromRange.Cells(8, 9).Style.Fill.BackgroundColor = XLColor.Blue;
+
+            ws.Columns().Width = 7;
+
+            workbook.SaveAs(filePath);
+        }
+
+        // Private
+
+        // Override
+
+
+        #endregion
+    }
+}

ClosedXML_Examples/Rows/RowCollection.cs

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+using System;
+using ClosedXML.Excel;
+
+
+namespace ClosedXML_Examples.Rows
+{
+    public class RowCollection : IXLExample
+    {
+        #region Variables
+
+        // Public
+
+        // Private
+
+
+        #endregion
+
+        #region Properties
+
+        // Public
+
+        // Private
+
+        // Override
+
+
+        #endregion
+
+
+        #region Events
+
+        // Public
+
+        // Private
+
+        // Override
+
+
+        #endregion
+
+        #region Methods
+
+        // Public
+        public void Create(String filePath)
+        {
+            var workbook = new XLWorkbook();
+            var ws = workbook.Worksheets.Add("Rows of a Range");
+
+            // All rows in a range
+            ws.Range("A1:B2").Rows().Style.Fill.BackgroundColor = XLColor.DimGray;
+
+            var bigRange = ws.Range("B4:C17");
+
+            // Contiguous rows by number
+            bigRange.Rows(1, 2).Style.Fill.BackgroundColor = XLColor.Red;
+
+            // Contiguous rows by number
+            bigRange.Rows("4:5").Style.Fill.BackgroundColor = XLColor.Blue;
+
+            // Spread rows by number
+            bigRange.Rows("7:8,10:11").Style.Fill.BackgroundColor = XLColor.Orange;
+
+            // Using a single number
+            bigRange.Rows("13").Style.Fill.BackgroundColor = XLColor.Cyan;
+
+            // Adjust the height
+            ws.Rows().Height = 15;
+
+            var ws2 = workbook.Worksheets.Add("Rows of a Worksheet");
+
+            // Contiguous rows by number
+            ws2.Rows(1, 2).Style.Fill.BackgroundColor = XLColor.Red;
+
+            // Contiguous rows by number
+            ws2.Rows("4:5").Style.Fill.BackgroundColor = XLColor.Blue;
+
+            // Spread rows by number
+            ws2.Rows("7:8,10:11").Style.Fill.BackgroundColor = XLColor.Orange;
+
+            // Using a single number
+            ws2.Rows("13").Style.Fill.BackgroundColor = XLColor.Cyan;
+
+            // Adjust the height
+            ws2.Rows("1:13").Height = 15;
+
+            workbook.SaveAs(filePath);
+        }
+
+        // Private
+
+        // Override
+
+
+        #endregion
+    }
+}

ClosedXML_Examples/Rows/RowSettings.cs

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+using System;
+using ClosedXML.Excel;
+
+
+namespace ClosedXML_Examples.Rows
+{
+    public class RowSettings : IXLExample
+    {
+        #region Variables
+
+        // Public
+
+        // Private
+
+
+        #endregion
+
+        #region Properties
+
+        // Public
+
+        // Private
+
+        // Override
+
+
+        #endregion
+
+        #region Constructors
+
+        // Public
+        public RowSettings()
+        {
+
+        }
+
+
+        // Private
+
+
+        #endregion
+
+        #region Events
+
+        // Public
+
+        // Private
+
+        // Override
+
+
+        #endregion
+
+        #region Methods
+
+        // Public
+        public void Create(String filePath)
+        {
+            var workbook = new XLWorkbook();
+            var ws = workbook.Worksheets.Add("Row Settings");
+
+            var row1 = ws.Row(2);
+            row1.Style.Fill.BackgroundColor = XLColor.Red;
+            row1.Height = 30;
+
+            var row2 = ws.Row(4);
+            row2.Style.Fill.BackgroundColor = XLColor.DarkOrange;
+            row2.Height = 3;
+
+            workbook.SaveAs(filePath);
+        }
+
+        // Private
+
+        // Override
+
+
+        #endregion
+    }
+}