Adding benchmark project (#3)

CsvHelper.FastDynamic.Performance/CsvHelper.FastDynamic.Performance.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="BenchmarkDotNet" Version="0.12.1" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\CsvHelper.FastDynamic\CsvHelper.FastDynamic.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Update="sampledata\SFO_Airport_Monthly_Utility_Consumption_for_Natural_Gas__Water__and_Electricity.csv">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
+</Project>

CsvHelper.FastDynamic.Performance/Internal/CsvReaderExtension.cs

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+using System.Collections.Generic;
+using System.Linq;
+
+namespace CsvHelper.FastDynamic.Performance.Internal
+{
+    internal static class CsvReaderExtension
+    {
+        internal static IList<IDictionary<string, object>> GetDictionaryRecords(this CsvReader csvReader)
+        {
+            // Read Header
+            csvReader.Read();
+            csvReader.ReadHeader();
+
+            var headerRecord = csvReader.Context
+                                        .HeaderRecord
+                                        .Select((x, i) => csvReader.Configuration.PrepareHeaderForMatch(x, i))
+                                        .ToArray();
+
+            var result = new List<IDictionary<string, object>>();
+
+            while (csvReader.Read())
+            {
+                var record = new Dictionary<string, object>(headerRecord.Length);
+
+                for (int i = 0; i < headerRecord.Length; i++)
+                {
+                    record[headerRecord[i]] = csvReader[i];
+                }
+
+                result.Add(record);
+            }
+
+            return result;
+        }
+    }
+}

CsvHelper.FastDynamic.Performance/Program.cs

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+using BenchmarkDotNet.Running;
+
+namespace CsvHelper.FastDynamic.Performance
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            BenchmarkRunner.Run<ReaderBenchmark>();
+        }
+    }
+}

CsvHelper.FastDynamic.Performance/ReaderBenchmark.cs

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+using System.Collections.Generic;
+using System.Globalization;
+using System.IO;
+using System.Linq;
+
+using BenchmarkDotNet.Attributes;
+
+using CsvHelper.FastDynamic.Performance.Internal;
+
+namespace CsvHelper.FastDynamic.Performance
+{
+    [MemoryDiagnoser]
+    public class ReaderBenchmark
+    {
+        private const string SampleCsvFile = @".\sampledata\SFO_Airport_Monthly_Utility_Consumption_for_Natural_Gas__Water__and_Electricity.csv";
+
+        public ReaderBenchmark()
+        {
+            _sampleCsvData = File.ReadAllText(SampleCsvFile);
+        }
+
+        private readonly string _sampleCsvData;
+
+        [Benchmark]
+        public IReadOnlyList<dynamic> GetRecords()
+        {
+            using var csvReader = new CsvReader(new StringReader(_sampleCsvData), CultureInfo.InvariantCulture);
+
+            return csvReader.GetRecords<dynamic>().ToArray();
+        }
+
+        [Benchmark]
+        public IReadOnlyList<IDictionary<string, object>> GetDictionaryRecords()
+        {
+            using var csvReader = new CsvReader(new StringReader(_sampleCsvData), CultureInfo.InvariantCulture);
+
+            return csvReader.GetDictionaryRecords().ToArray();
+        }
+
+        [Benchmark]
+        public IReadOnlyList<dynamic> GetDynamicRecords()
+        {
+            using var csvReader = new CsvReader(new StringReader(_sampleCsvData), CultureInfo.InvariantCulture);
+
+            return csvReader.GetDynamicRecords();
+        }
+    }
+}