Allow private constructors to be used to instantiate new class instan…

…ces.

src/CsvHelper.Tests/Issues/Issue920.cs

@@ -0,0 +1,54 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Reflection;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CsvHelper.Tests.Issues
+{
+	[TestClass]
+	public class Issue920
+	{
+		[TestMethod]
+		public void Test1()
+		{
+			using( var stream = new MemoryStream() )
+			using( var writer = new StreamWriter( stream ) )
+			using( var reader = new StreamReader( stream ) )
+			using( var csv = new CsvReader( reader ) )
+			{
+				writer.WriteLine( "A,B" );
+				writer.WriteLine( "1,one" );
+				writer.WriteLine( "2,two" );
+				writer.Flush();
+				stream.Position = 0;
+
+				csv.Configuration.GetConstructor = type =>
+					type.GetConstructors( BindingFlags.NonPublic | BindingFlags.Instance )
+					.OrderBy( c => c.GetParameters().Length )
+					.First();
+				csv.Configuration.IncludePrivateMembers = true;
+				var records = csv.GetRecords<Sample>().ToList();
+
+				Assert.AreEqual( 2, records.Count );
+			}
+		}
+
+		private class Sample
+		{
+			public int A { get; private set; }
+			public string B { get; private set; }
+
+			private Sample() { }
+
+			public Sample( int a, string b )
+			{
+				A = a;
+				B = b;
+			}
+		}
+	}
+}

src/CsvHelper.Tests/Mappings/MapConstructorTests.cs

@@ -43,7 +43,7 @@ private class Test
 
 		private sealed class TestMap : ClassMap<Test>
 		{
-			private TestMap()
+			private TestMap( string test )
 			{
 				Map( m => m.Id );
 				Map( m => m.Name );

src/CsvHelper.Tests/Reflection/CreateInstanceTests.cs

@@ -22,12 +22,25 @@ public void CreateInstanceTests()
 			Assert.AreEqual( "name", test.Name );
 		}
 
+		[TestMethod]
+		public void PrivateConstructorTest()
+		{
+			var c = ReflectionHelper.CreateInstance<PrivateConstructor>();
+
+			Assert.IsNotNull( c );
+		}
+
 		private class Test
 		{
 			public string Name
 			{
 				get { return "name"; }
 			}
 		}
+
+		private class PrivateConstructor
+		{
+			private PrivateConstructor() { }
+		}
 	}
 }

src/CsvHelper/CsvHelper.csproj

@@ -8,7 +8,7 @@
 		<Authors>Josh Close</Authors>
 
 		<!-- Build -->
-		<Version>7.0.0</Version>
+		<Version>7.0.1</Version>
 		<FileVersion>7.0.0.0</FileVersion>
 		<AssemblyVersion>7.0.0.0</AssemblyVersion>
 		<TargetFrameworks>netstandard2.0;net45</TargetFrameworks>

src/CsvHelper/ReflectionHelper.cs

@@ -187,7 +187,7 @@ private static Delegate CreateInstanceDelegate( Type type, params object[] args
 			{
 				var argumentTypes = args.Select( a => a.GetType() ).ToArray();
 				var argumentExpressions = argumentTypes.Select( ( t, i ) => Expression.Parameter( t, "var" + i ) ).ToArray();
-				var constructorInfo = type.GetConstructor( argumentTypes );
+				var constructorInfo = type.GetConstructor( BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance, null, argumentTypes, null );
 				if( constructorInfo == null )
 				{
 					throw new InvalidOperationException( "No public parameterless constructor found." );