Added C# marshalling of parameters of type array of const char*.

Signed-off-by: Dimitar Dobrev <dpldobrev@protonmail.com>

src/Generator/Generators/CSharp/CSharpMarshal.cs

@@ -854,7 +854,8 @@ namespace CppSharp.Generators.CSharp
 
         private void MarshalVariableArray(Type arrayType)
         {
-            if (arrayType.IsPrimitiveType())
+            if (arrayType.IsPrimitiveType() ||
+                arrayType.IsPointerToPrimitiveType(PrimitiveType.Char))
             {
                 Context.Return.Write(Context.Parameter.Name);
                 return;

src/Generator/Generators/CSharp/CSharpTypePrinter.cs

@@ -126,7 +126,11 @@ namespace CppSharp.Generators.CSharp
                 return "string";
 
             if (arrayType.IsPointerToPrimitiveType(PrimitiveType.Char))
-                return "char**";
+            {
+                var prefix = ContextKind == TypePrinterContextKind.Managed ? string.Empty :
+                    "[MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.LPStr)] ";
+                return $"{prefix}string[]";
+            }
 
             var arraySuffix = array.SizeType != ArrayType.ArraySize.Constant &&
                 MarshalKind == MarshalKind.ReturnVariableArray ?

tests/CSharp/CSharp.Tests.cs

@@ -1069,6 +1069,13 @@ public unsafe class CSharpTests : GeneratorTestFixture
         Assert.That(CSharp.CSharp.TakeArrays(pointers, ints, values), Is.EqualTo(50));
     }
 
+    [Test]
+    public void TestStringArrayParams()
+    {
+        string[] strings = { "The ", "test ", "works." };
+        Assert.That(CSharp.CSharp.TakeStringArray(strings), Is.EqualTo("The test works."));
+    }
+
     private class OverrideVirtualTemplate : VirtualTemplate<int>
     {
         public override int Function

tests/CSharp/CSharp.cpp

@@ -1398,3 +1398,13 @@ int takeArrays(Foo* arrayOfPointersToObjects[], int arrayOfPrimitives[], Foo arr
            arrayOfPrimitives[0] + arrayOfPrimitives[1] +
            arrayOfObjects[0].A + arrayOfObjects[1].A;
 }
+
+std::string takeStringArray(const char* arrayOfStrings[])
+{
+    std::string result;
+    for (int i = 0; i < 3; i++)
+    {
+        result += arrayOfStrings[i];
+    }
+    return result;
+}

tests/CSharp/CSharp.h

@@ -1238,3 +1238,5 @@ inline namespace InlineNamespace
 }
 
 DLL_API int takeArrays(Foo* arrayOfPointersToObjects[], int arrayOfPrimitives[], Foo arrayOfObjects[]);
+
+DLL_API std::string takeStringArray(const char* arrayOfStrings[]);