[C#] support Object API (#5710)

* [C#] support Object API

* fix sign-compare

* fix indent

* add new line before for loop.

* using auto whenever possible

* reduce the amout of blank lines.

* wip: support vectors of union

* done: support unions of vectors

* set C# version to 4.0
* remove null propagation operator
* remove auto property initializer
* remove expression-bodied method
* remove pattern matching

* add Example2 to NetTest.sh

* separate JavaUsage.md and CsharpUsage.md from JavaCsharpUsage.md

* add C# Object based API notes.

* support vs2010.

* remove range based for loop.

* remove System.Linq

* fix indent

* CreateSharedString to CreateString

* check shared attribute

* snake case

2 files changed, 52 insertions, 0 deletions

diff --git a/tests/namespace_test/NamespaceA/NamespaceB/StructInNestedNS.cs b/tests/namespace_test/NamespaceA/NamespaceB/StructInNestedNS.cs
index 9aba8db7..9f6d8dc7 100644
--- a/tests/namespace_test/NamespaceA/NamespaceB/StructInNestedNS.cs
+++ b/tests/namespace_test/NamespaceA/NamespaceB/StructInNestedNS.cs
@@ -6,6 +6,7 @@ namespace NamespaceA.NamespaceB
 {
 
 using global::System;
+using global::System.Collections.Generic;
 using global::FlatBuffers;
 
 public struct StructInNestedNS : IFlatbufferObject
@@ -26,7 +27,34 @@ public struct StructInNestedNS : IFlatbufferObject
     builder.PutInt(A);
     return new Offset<NamespaceA.NamespaceB.StructInNestedNS>(builder.Offset);
   }
+  public StructInNestedNST UnPack() {
+    var _o = new StructInNestedNST();
+    this.UnPackTo(_o);
+    return _o;
+  }
+  public void UnPackTo(StructInNestedNST _o) {
+    _o.A = this.A;
+    _o.B = this.B;
+  }
+  public static Offset<NamespaceA.NamespaceB.StructInNestedNS> Pack(FlatBufferBuilder builder, StructInNestedNST _o) {
+    if (_o == null) return default(Offset<NamespaceA.NamespaceB.StructInNestedNS>);
+    return CreateStructInNestedNS(
+      builder,
+      _o.A,
+      _o.B);
+  }
 };
 
+public class StructInNestedNST
+{
+  public int A { get; set; }
+  public int B { get; set; }
+
+  public StructInNestedNST() {
+    this.A = 0;
+    this.B = 0;
+  }
+}
+
 
 }
diff --git a/tests/namespace_test/NamespaceA/NamespaceB/TableInNestedNS.cs b/tests/namespace_test/NamespaceA/NamespaceB/TableInNestedNS.cs
index f8ea32b5..88d03425 100644
--- a/tests/namespace_test/NamespaceA/NamespaceB/TableInNestedNS.cs
+++ b/tests/namespace_test/NamespaceA/NamespaceB/TableInNestedNS.cs
@@ -6,6 +6,7 @@ namespace NamespaceA.NamespaceB
 {
 
 using global::System;
+using global::System.Collections.Generic;
 using global::FlatBuffers;
 
 public struct TableInNestedNS : IFlatbufferObject
@@ -34,7 +35,30 @@ public struct TableInNestedNS : IFlatbufferObject
     int o = builder.EndTable();
     return new Offset<NamespaceA.NamespaceB.TableInNestedNS>(o);
   }
+  public TableInNestedNST UnPack() {
+    var _o = new TableInNestedNST();
+    this.UnPackTo(_o);
+    return _o;
+  }
+  public void UnPackTo(TableInNestedNST _o) {
+    _o.Foo = this.Foo;
+  }
+  public static Offset<NamespaceA.NamespaceB.TableInNestedNS> Pack(FlatBufferBuilder builder, TableInNestedNST _o) {
+    if (_o == null) return default(Offset<NamespaceA.NamespaceB.TableInNestedNS>);
+    return CreateTableInNestedNS(
+      builder,
+      _o.Foo);
+  }
 };
 
+public class TableInNestedNST
+{
+  public int Foo { get; set; }
+
+  public TableInNestedNST() {
+    this.Foo = 0;
+  }
+}
+
 
 }