added netstandard2.0 target to reduce dependencies

README.md

@@ -260,11 +260,10 @@ DefaultEcs support serialization to save and load a World state. Two implementat
 - IComponentTypeReader is used to get the settings of the serialized World in case a maxComponentCount has been set for a specific type different from the maxEntityCount
 - IComponentReader is used to get all the components of an Entity
 
-The provided implementation TextSerializer and BinarySerializer are still in development and do not support serialization of types without a default constructor.
-Nonetheless both are highly permissive and will serialize every fields and properties even if the are private or readonly and do not require any attribute decoration to work.
+The provided implementation TextSerializer and BinarySerializer are highly permissive and will serialize every fields and properties even if the are private or readonly and do not require any attribute decoration to work.
 This was a target from the get go as graphic and framework libraries do not always have well decorated type which would be used as component.
+Although the lowest target is netstandard1.1, please be aware that the capability of both implementation to handle type with no default constructor maybe not work if the version of your .NET plateform is too low.
 
-If you have knownledge of a serialization framework which works with everything without decoration or external schema file, please tell me because serialization is pain and I should not have started this thing.
 
 ```C#
 ISerializer serializer = new TextSerializer();

source/DefaultEcs/DefaultEcs.csproj

@@ -1,7 +1,10 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup Label="Compilation">
     <LangVersion>latest</LangVersion>
-    <TargetFramework>netstandard1.1</TargetFramework>
+    <TargetFrameworks>
+      netstandard1.1;
+      netstandard2.0;
+    </TargetFrameworks>
     <Optimize>true</Optimize>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <Configurations>Debug;Release</Configurations>
@@ -15,13 +18,15 @@
     <Optimize>false</Optimize>
     <DefineConstants>DEBUG</DefineConstants>
   </PropertyGroup>
-
+
+  <ItemGroup Label="netstandard1.1 Reference" Condition="'$(TargetFramework)'=='netstandard1.1'">
+    <PackageReference Include="System.Runtime" Version="4.3.0" />
+
+    <PackageReference Label="Documentation" Include="Vsxmd" Version="1.3.3" PrivateAssets="All" />
+  </ItemGroup>
   <ItemGroup Label="Reference">
     <PackageReference Include="System.Memory" Version="4.5.1" />
     <PackageReference Include="System.Reflection.Emit.Lightweight" Version="4.3.0" />
-    <PackageReference Include="System.Runtime" Version="4.3.0" />
-
-    <PackageReference Label="Documentation" Include="Vsxmd" Version="1.3.3" PrivateAssets="All" />
   </ItemGroup>
 
   <PropertyGroup Label="Package">
@@ -38,7 +43,7 @@
     <Version>0.6.1</Version>
     <PackageReleaseNotes>
 added RemoveFromChildrenOf and RemoveFromParentsOf methods on Entity to remove hierarchy of dispose chain
-BinarySerializer and TextSerializer now handle abstract types
+BinarySerializer and TextSerializer now handle abstract types and types with no default constructor
 some fixes on BinarySerializer and TextSerializer
     </PackageReleaseNotes>
   </PropertyGroup>

source/DefaultEcs/Technical/Serialization/BinarySerializer/Converter.cs

@@ -4,7 +4,11 @@
 using System.Linq;
 using System.Reflection;
 using System.Reflection.Emit;
+#if NETSTANDARD1_1
 using System.Runtime.CompilerServices;
+#else
+using System.Runtime.Serialization;
+#endif
 
 namespace DefaultEcs.Technical.Serialization.BinarySerializer
 {
@@ -142,7 +146,12 @@ static Converter()
                     {
                         readGenerator.Emit(
                             OpCodes.Call,
-                            typeof(RuntimeHelpers).GetRuntimeMethod("GetUninitializedObject", new[] { typeof(Type) }) ?? typeof(Activator).GetRuntimeMethod(nameof(Activator.CreateInstance), new[] { typeof(Type) }));
+#if NETSTANDARD1_1
+                            typeof(RuntimeHelpers).GetRuntimeMethod("GetUninitializedObject", new[] { typeof(Type) }) ?? typeof(Activator).GetRuntimeMethod(nameof(Activator.CreateInstance), new[] { typeof(Type) })
+#else
+                            typeof(FormatterServices).GetMethod(nameof(FormatterServices.GetUninitializedObject))
+#endif
+                            );
                         readGenerator.Emit(OpCodes.Castclass, _type);
                         readGenerator.Emit(OpCodes.Stloc, readValue);
                     }

source/DefaultEcs/Technical/Serialization/TextSerializer/Converter.cs

@@ -6,8 +6,12 @@
 using System.Linq.Expressions;
 using System.Reflection;
 using System.Reflection.Emit;
-using System.Runtime.CompilerServices;
 using System.Text.RegularExpressions;
+#if NETSTANDARD1_1
+using System.Runtime.CompilerServices;
+#else
+using System.Runtime.Serialization;
+#endif
 
 namespace DefaultEcs.Technical.Serialization.TextSerializer
 {
@@ -116,10 +120,14 @@ static Converter()
             }
             else
             {
+#if NETSTANDARD1_1
                 MethodInfo method =
                     typeof(RuntimeHelpers).GetRuntimeMethod("GetUninitializedObject", new[] { typeof(Type) })
                     ?? typeof(Activator).GetRuntimeMethod(nameof(Activator.CreateInstance), new[] { typeof(Type) });
                 _constructor = (Func<Type, object>)method.CreateDelegate(typeof(Func<Type, object>));
+#else
+                _constructor = FormatterServices.GetUninitializedObject;
+#endif
             }
 
             _readFieldActions = new Dictionary<string, ReadFieldAction>();