Add netstandard2.0 target

Directory.Packages.props

@@ -30,6 +30,14 @@
     <PackageVersion Include="xunit" Version="2.9.2" />
     <PackageVersion Include="Xunit.SkippableFact" Version="1.5.23" />
   </ItemGroup>
+  <ItemGroup Condition="'$(TargetFrameworkIdentifier)'!='.NETCoreApp'">
+    <PackageVersion Include="Microsoft.Bcl.HashCode" Version="6.0.0" />
+    <PackageVersion Include="System.Collections.Immutable" Version="9.0.0" />
+    <PackageVersion Include="System.Text.Json" Version="9.0.0" />
+  </ItemGroup>
+  <ItemGroup Condition="'$(IsAnalyzerProject)'=='true'">
+    <PackageVersion Update="System.Collections.Immutable" Version="8.0.0" />
+  </ItemGroup>
   <ItemGroup>
     <GlobalPackageReference Include="CSharpIsNullAnalyzer" Version="0.1.593" />
     <GlobalPackageReference Include="DotNetAnalyzers.DocumentationAnalyzers" Version="1.0.0-beta.59" />

docfx/docs/custom-converters.md

@@ -41,20 +41,43 @@ Applications that have a legitimate need to exceed the default stack depth limit
 
 The @Nerdbank.MessagePack.SerializationContext.GetConverter*?displayProperty=nameWithType method may be used to obtain a converter to use for members of the type your converter is serializing or deserializing.
 
-[!code-csharp[](../../samples/CustomConverters.cs#DelegateSubValues)]
+# [.NET](#tab/net)
+
+[!code-csharp[](../../samples/CustomConverters.cs#DelegateSubValuesNET)]
+
+# [.NET Standard](#tab/netfx)
+
+[!code-csharp[](../../samples/CustomConverters.cs#DelegateSubValuesNETFX)]
+
+---
 
 The above assumes that `SomeOtherType` is a type that you declare and can have @PolyType.GenerateShapeAttribute`1 applied to it.
 If this is not the case, you may provide your own type shape and reference that.
 For convenience, you may want to apply it directly to your custom converter:
 
-[!code-csharp[](../../samples/CustomConverters.cs#WitnessOnFormatter)]
+# [.NET](#tab/net)
+
+[!code-csharp[](../../samples/CustomConverters.cs#WitnessOnFormatterNET)]
+
+# [.NET Standard](#tab/netfx)
+
+[!code-csharp[](../../samples/CustomConverters.cs#WitnessOnFormatterNETFX)]
+
+---
 
 The @PolyType.GenerateShapeAttribute`1 is what enables `FooConverter` to be a "provider" for the shape of `SomeOtherType`.
 
 Arrays of a type require a shape of their own.
 So even if you define your type `MyType` with @PolyType.GenerateShapeAttribute`1, serializing `MyType[]` would require a witness type and attribute. For example:
 
-[!code-csharp[](../../samples/CustomConverters.cs#ArrayWitnessOnFormatter)]
+
+# [.NET](#tab/net)
+
+[!code-csharp[](../../samples/CustomConverters.cs#ArrayWitnessOnFormatterNET)]
+
+# [.NET Standard](#tab/netfx)
+
+[!code-csharp[](../../samples/CustomConverters.cs#ArrayWitnessOnFormatterNETFX)]
 
 ### Version compatibility
 

docfx/docs/getting-started.md

@@ -15,7 +15,15 @@ Given a type annotated with [`GenerateShapeAttribute`](xref:PolyType.GenerateSha
 
 You can serialize and deserialize it like this:
 
-[!code-csharp[](../../samples/GettingStarted.cs#SimpleRecordRoundtrip)]
+# [.NET](#tab/net)
+
+[!code-csharp[](../../samples/GettingStarted.cs#SimpleRecordRoundtripNET)]
+
+# [.NET Standard](#tab/netfx)
+
+[!code-csharp[](../../samples/GettingStarted.cs#SimpleRecordRoundtripNETFX)]
+
+---
 
 Only the top-level types that you serialize need the attribute.
 All types that they reference will automatically have their 'shape' source generated as well so the whole object graph can be serialized.

docfx/docs/security.md

@@ -43,7 +43,15 @@ Instead, you can provide your own defense by initializing your collections with
 
 Here is an example of a defense against hash collisions:
 
-[!code-csharp[](../../samples/Security.cs#SecureEqualityComparers)]
+# [.NET](#tab/net)
+
+[!code-csharp[](../../samples/Security.cs#SecureEqualityComparersNET)]
+
+# [.NET Standard](#tab/netfx)
+
+[!code-csharp[](../../samples/Security.cs#SecureEqualityComparersNETFX)]
+
+---
 
 Note how the collection properties do *not* define a property setter.
 This is crucial to the threat mitigation, since it activates the deserializer behavior of not recreating the collection using the default (insecure) equality comparer.

docfx/docs/type-shapes.md

@@ -16,7 +16,15 @@ Doing so leads to default serialization rules being applied to the type (e.g. on
 For this example, suppose you consume a `FamilyTree` type from a library that you don't control and did not annotate their type for serialization.
 In your own project, you can define this witness type and use it to serialize an external type.
 
-[!code-csharp[](../../samples/TypeShapePatterns.cs#Witness)]
+# [.NET](#tab/net)
+
+[!code-csharp[](../../samples/TypeShapePatterns.cs#WitnessNET)]
+
+# [.NET Standard](#tab/netfx)
+
+[!code-csharp[](../../samples/TypeShapePatterns.cs#WitnessNETFX)]
+
+---
 
 Note the only special bit is providing the `Witness` class as a type argument to the `Serialize` method.
 The _name_ of the witness class is completely inconsequential.

docfx/docs/unions.md

@@ -11,7 +11,15 @@ For instance, suppose you have this type to serialize:
 But there are many kinds of animals.
 You can get them to serialize and deserialize correctly like this:
 
-[!code-csharp[](../../samples/Unions.cs#FarmAnimals)]
+# [.NET](#tab/net)
+
+[!code-csharp[](../../samples/Unions.cs#FarmAnimalsNET)]
+
+# [.NET Standard](#tab/netfx)
+
+[!code-csharp[](../../samples/Unions.cs#FarmAnimalsNETFX)]
+
+---
 
 This changes the schema of the serialized data to include a tag that indicates the type of the object.
 
@@ -50,7 +58,15 @@ This is because the `Horse` type is statically known as the generic type argumen
 
 Now suppose you have different breeds of horses that each had their own subtype:
 
-[!code-csharp[](../../samples/Unions.cs#HorseBreeds)]
+# [.NET](#tab/net)
+
+[!code-csharp[](../../samples/Unions.cs#HorseBreedsNET)]
+
+# [.NET Standard](#tab/netfx)
+
+[!code-csharp[](../../samples/Unions.cs#HorseBreedsNETFX)]
+
+---
 
 At this point your `HorsePen` *would* serialize with the union schema around each horse:
 ```json
@@ -73,4 +89,12 @@ This witness type must be specified as a second type argument to @Nerdbank.Messa
 
 For example:
 
-[!code-csharp[](../../samples/Unions.cs#ClosedGenericSubTypes)]
+# [.NET](#tab/net)
+
+[!code-csharp[](../../samples/Unions.cs#ClosedGenericSubTypesNET)]
+
+# [.NET Standard](#tab/netfx)
+
+[!code-csharp[](../../samples/Unions.cs#ClosedGenericSubTypesNETFX)]
+
+---

samples/.editorconfig

@@ -1,5 +1,7 @@
 [*.cs]
 
+indent_style = space
+
 # SA1123: Do not place regions within elements
 dotnet_diagnostic.SA1123.severity = none
 

samples/ApplyingSerializationContext.cs

@@ -3,20 +3,16 @@
 
 partial class ApplyingSerializationContext
 {
-	void ApplyingContext()
-	{
-		#region ApplyingStartingContext
-		MessagePackSerializer serializer = new()
-		{
-			StartingContext = new SerializationContext
-			{
-				MaxDepth = 128,
-			},
-		};
-		serializer.Serialize(new SomeType());
-		#endregion
-	}
-
-	[GenerateShape]
-	internal partial record SomeType;
+    void ApplyingContext()
+    {
+        #region ApplyingStartingContext
+        MessagePackSerializer serializer = new()
+        {
+            StartingContext = new SerializationContext
+            {
+                MaxDepth = 128,
+            },
+        };
+        #endregion
+    }
 }