base commit

ExcelHelper/ExcelHelper.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.8.34511.84
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ExcelHelper", "ExcelHelper\ExcelHelper.csproj", "{A27BBD28-F1A8-46D6-90E7-7026B6DA54BA}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{A27BBD28-F1A8-46D6-90E7-7026B6DA54BA}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A27BBD28-F1A8-46D6-90E7-7026B6DA54BA}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A27BBD28-F1A8-46D6-90E7-7026B6DA54BA}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A27BBD28-F1A8-46D6-90E7-7026B6DA54BA}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {57173180-D546-4DCE-8829-F7A664D607CF}
+	EndGlobalSection
+EndGlobal

ExcelHelper/ExcelHelper/ExcelHelper.cs

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+using DocumentFormat.OpenXml.Packaging;
+using DocumentFormat.OpenXml.Spreadsheet;
+using System.Text;
+using System.Text.RegularExpressions;
+
+namespace ExcelHelper
+{
+    public class ExcelHelper
+    {
+        private static readonly ExcelHelper _instance = new ExcelHelper();
+
+        public static ExcelHelper Instance { get { return _instance; } }
+
+        /// <summary>
+        /// Get excel data
+        /// </summary>
+        /// <param name="sourcePath">excel path</param>
+        /// <param name="sheetName">sheet name</param>
+        /// <param name="rowStartPosition">row start position (first row = 1)</param>
+        /// <param name="tempPath">copy path</param>
+        /// <returns></returns>
+        /// <exception cref="Exception"></exception>
+        public List<Dictionary<string, string>> GetData(string sourcePath, string sheetName, bool removeHeader, int rowStartPosition = 1, string tempPath = "./temp_file.xlsx")
+        {
+            File.Copy(sourcePath, tempPath, true);
+
+            List<Dictionary<string, string>> data = new List<Dictionary<string, string>>();
+
+            StringBuilder sb = new StringBuilder();
+            using (SpreadsheetDocument doc = SpreadsheetDocument.Open(tempPath, true))
+            {
+                WorkbookPart workbookPart = doc.WorkbookPart;
+                Sheet sheet = workbookPart.Workbook.Descendants<Sheet>().FirstOrDefault(s => s.Name == sheetName);
+
+                if (sheet == null)
+                    throw new Exception("Cannot find sheet.");
+
+                WorksheetPart worksheetPart = (WorksheetPart)workbookPart.GetPartById(sheet.Id);
+                Worksheet worksheet = worksheetPart.Worksheet;
+
+                List<Row> rows = worksheet.Descendants<Row>().Where(r => r.RowIndex >= rowStartPosition).ToList();
+                if (removeHeader)
+                    rows.RemoveAt(0);
+
+                for (int i = 0; i < rows.Count; i++)
+                {
+                    Dictionary<string, string> rowPairs = RowToKeyValuePairs(rows[i], workbookPart);
+                    if (rowPairs == null || rowPairs.Count < 1)
+                        continue;
+
+                    data.Add(rowPairs);
+                }
+            }
+
+            return data;
+        }
+
+        private Dictionary<string, string> RowToKeyValuePairs(Row row, WorkbookPart workbookPart)
+        {
+            Dictionary<string, string> pairs = new Dictionary<string, string>();
+            var cells = row.Elements<Cell>().ToList();
+
+            for (int col = 0; col < cells.Count; col++)
+            {
+                Cell cell = cells[col];
+
+                string cellReference = cell.CellReference.Value;
+                string columnName = Regex.Replace(cellReference, @"\d", "");
+                //int rowNumber = int.Parse(Regex.Replace(cellReference, "[^0-9]", ""));
+
+                string cellValue = cell.CellValue?.InnerText;
+                if (cell.DataType != null && cell.DataType.Value == CellValues.SharedString)
+                {
+                    int.TryParse(cellValue, out int sharedStringId);
+                    cellValue = workbookPart.SharedStringTablePart.SharedStringTable.Elements<SharedStringItem>().ElementAt(sharedStringId).InnerText;
+                }
+
+                pairs.Add(columnName, cellValue);
+            }
+
+            return pairs;
+        }
+
+        private string ConvertValue(Dictionary<string, string> pairs, string key)
+        {
+            if (!pairs.ContainsKey(key))
+                return null;
+
+            return pairs[key];
+        }
+
+        private T ConvertValue<T>(Dictionary<string, string> pairs, string key, Func<string, T> func)
+        {
+            if (!pairs.ContainsKey(key) || func == null)
+                return default(T);
+
+            string value = pairs[key];
+            return func(value);
+        }
+
+        private DateTime? ConvertValueToDateTime(Dictionary<string, string> pairs, string key)
+        {
+            return ConvertValue<DateTime?>(pairs, key, x =>
+            {
+                if (string.IsNullOrEmpty(x))
+                    return null;
+
+                if (double.TryParse(x, out double d))
+                    return DateTime.FromOADate(d);
+                else
+                    return null;
+            });
+        }
+    }
+}

ExcelHelper/ExcelHelper/ExcelHelper.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="DocumentFormat.OpenXml" Version="3.0.1" />
+  </ItemGroup>
+
+</Project>