Read a polygon with a hole from a ShapeFile

NetTopologySuite.IO.ShapeFile.sln

@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 15
-VisualStudioVersion = 15.0.27004.2009
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.31321.278
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{B0923F22-AF00-46DA-B5CE-73F4D398DE37}"
 	ProjectSection(SolutionItems) = preProject

PerfApp/Perf.cs

@@ -0,0 +1,46 @@
+using BenchmarkDotNet.Attributes;
+using NetTopologySuite.Geometries;
+using NetTopologySuite.IO;
+using System.Linq;
+
+namespace PerfApp
+{
+    public class Perf
+    {
+        private const int Count = 50000;
+        private const int Step = 10;
+
+        private static readonly GeometryFactory Fac = GeometryFactory.Default;
+
+        private readonly string fname;
+
+        public Perf()
+        {
+            var features = Utils.CreateFeatures(Fac, Count, Step).ToList();
+            fname = Utils.WriteFeatures(features);
+        }
+
+        private int InternalRead()
+        {
+            int i = 0;
+            var reader = Shapefile.CreateDataReader(fname, Fac);
+            while (reader.Read())
+                i++;
+            return i;
+        }
+
+        [Benchmark]
+        public int ReadWithFlagDisabled()
+        {
+            Shapefile.ExperimentalPolygonBuilderEnabled = false;
+            return InternalRead();
+        }
+
+        [Benchmark]
+        public int ReadWithFlagEnabled()
+        {
+            Shapefile.ExperimentalPolygonBuilderEnabled = true;
+            return InternalRead();
+        }
+    }
+}

PerfApp/PerfApp.csproj

@@ -0,0 +1,36 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Remove="nts_develop\**" />
+    <Compile Remove="nts_features\**" />
+    <Compile Remove="nts_patch_595\**" />
+    <EmbeddedResource Remove="nts_develop\**" />
+    <EmbeddedResource Remove="nts_features\**" />
+    <EmbeddedResource Remove="nts_patch_595\**" />
+    <None Remove="nts_develop\**" />
+    <None Remove="nts_features\**" />
+    <None Remove="nts_patch_595\**" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="BenchmarkDotNet" Version="0.13.1" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Reference Include="NetTopologySuite">
+      <HintPath>nts_patch_595\NetTopologySuite.dll</HintPath>
+    </Reference>
+    <Reference Include="NetTopologySuite.Features">
+      <HintPath>nts_features\NetTopologySuite.Features.dll</HintPath>
+    </Reference>
+    <Reference Include="NetTopologySuite.IO.ShapeFile">
+      <HintPath>nts_shapefile\NetTopologySuite.IO.ShapeFile.dll</HintPath>
+    </Reference>
+  </ItemGroup>
+
+</Project>

PerfApp/PerfApp.sln

@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.31321.278
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "PerfApp", "PerfApp.csproj", "{64DBD7B8-EE86-40F3-81BF-4D1E0049662F}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{64DBD7B8-EE86-40F3-81BF-4D1E0049662F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{64DBD7B8-EE86-40F3-81BF-4D1E0049662F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{64DBD7B8-EE86-40F3-81BF-4D1E0049662F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{64DBD7B8-EE86-40F3-81BF-4D1E0049662F}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {4FC81A8C-F367-4B21-9955-39FFAE513605}
+	EndGlobalSection
+EndGlobal

PerfApp/Program.cs

@@ -0,0 +1,12 @@
+using BenchmarkDotNet.Running;
+
+namespace PerfApp
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            var summary = BenchmarkRunner.Run<Perf>();
+        }
+    }
+}

PerfApp/Utils.cs

@@ -0,0 +1,71 @@
+using NetTopologySuite.Features;
+using NetTopologySuite.Geometries;
+using NetTopologySuite.IO;
+using System.Collections.Generic;
+using System.IO;
+
+namespace PerfApp
+{
+    internal static class Utils
+    {
+        internal static IEnumerable<IFeature> CreateFeatures(GeometryFactory fac, uint count, uint step)
+        {
+            var list = new List<Polygon>();
+            int counter = 0;
+            int indexer = 0;
+            for (uint i = 1; i < count * 10; i += step)
+            {
+                var shell = fac.CreateLinearRing(new Coordinate[]
+                {
+                    new Coordinate(1 * i, 1 * i),
+                    new Coordinate(9 * i, 1 * i),
+                    new Coordinate(9 * i, 9* i),
+                    new Coordinate(1 * i, 9* i),
+                    new Coordinate(1 * i, 1* i),
+                });
+                var hole1 = fac.CreateLinearRing(new Coordinate[]
+                {
+                    new Coordinate(2* i, 2* i),
+                    new Coordinate(3* i, 3* i),
+                    new Coordinate(4* i, 2* i),
+                    new Coordinate(2* i, 2* i),
+                });
+                var hole2 = fac.CreateLinearRing(new Coordinate[]
+                {
+                    new Coordinate(6* i, 6* i),
+                    new Coordinate(8* i, 8* i),
+                    new Coordinate(7* i, 6* i),
+                    new Coordinate(6* i, 6* i),
+                });
+                var poly = fac.CreatePolygon(shell, new[] { hole1, hole2 });
+                list.Add(poly);
+                if (++counter >= 100)
+                {
+                    var mpoly = fac.CreateMultiPolygon(list.ToArray());
+                    var attrs = new AttributesTable { { "id", ++indexer } };
+                    yield return new Feature(mpoly, attrs);
+
+                    list.Clear();
+                    counter = 0;
+                }
+            }
+            if (list.Count != 0)
+            {
+                var mpoly1 = fac.CreateMultiPolygon(list.ToArray());
+                var attrs1 = new AttributesTable { { "id", ++indexer } };
+                yield return new Feature(mpoly1, attrs1);
+            }
+        }
+
+        internal static string WriteFeatures(IList<IFeature> features)
+        {
+            string fname = Path.ChangeExtension(Path.GetTempFileName(), ".shp");
+            var header = ShapefileDataWriter.GetHeader(features[0], features.Count);
+            var writer = new ShapefileDataWriter(fname) { Header = header };
+            writer.Write(features);
+            return Path.Combine(
+                Path.GetDirectoryName(fname),
+                Path.GetFileNameWithoutExtension(fname));
+        }
+    }
+}

PerfApp/nts_develop/NetTopologySuite.deps.json

@@ -0,0 +1,152 @@
+{
+  "runtimeTarget": {
+    "name": ".NETStandard,Version=v2.0/",
+    "signature": ""
+  },
+  "compilationOptions": {},
+  "targets": {
+    ".NETStandard,Version=v2.0": {},
+    ".NETStandard,Version=v2.0/": {
+      "NetTopologySuite/2.5.0-pre.190390493+local": {
+        "dependencies": {
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+          "System.Memory": "4.5.4"
+        },
+        "runtime": {
+          "NetTopologySuite.dll": {}
+        }
+      },
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+          "Microsoft.SourceLink.Common": "1.1.1"
+        }
+      },
+      "NETStandard.Library/2.0.3": {
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+        }
+      },
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+      "System.Memory/4.5.4": {
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