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Can you please provide an example where a complex type or an arrary of complex types is handed to c# by ref.

Unmanaged code (c++) creates a complex type and fills this type with some data.
Unmanaged code calls an c# Function and hands over the complex type.
c# Reads the data that has been provided by unmanaged code.
c# Modifies the data and hands back the modified data to unmanaged code.
Unmanaged code (c++) uses the data which has been modified by c#.

VS2012, C#.
Create ClassLibrary project, install DllExport 1.7.3 package, add function from example. Compiler can't find DllExport and DllExportAttribute.

What's wrong?

Thinking to convert a method from synchronous to async

        [DllExport]
        [return: MarshalAs(UnmanagedType.LPWStr)]
        public static string IsAppRegistered()
        {
            try
            {
                string[] scopes = "User.Read,User.ReadBasic.All".Split(',');
                
                var tokenRequest = tokenAcquisitionHelper.AcquireATokenFromCacheOrIntegratedWindowwAuthenticationAsync(scopes);
                AuthenticationResult authenticationResult = tokenRequest.Result;
            }

Have my doubts on if this would be supported at all, or if I am not understanding how to configure it

        [DllExport]
        [return: MarshalAs(UnmanagedType.LPWStr)]
        public static async Task<string> IsAppRegistered()
        {
            try
            {
                string[] scopes = "User.Read,User.ReadBasic.All".Split(',');
                
                var tokenRequest = tokenAcquisitionHelper.AcquireATokenFromCacheOrIntegratedWindowwAuthenticationAsync(scopes);
                AuthenticationResult authenticationResult = await tokenRequest;
            }
            catch (MsalUiRequiredException ex) when (ex.Message.Contains("AADSTS65001"))

DLL is built, function exported, but on trying to use method it raises the exception about the result

Unhandled Exception: System.Runtime.InteropServices.MarshalDirectiveException: Cannot marshal 'return value': Generic types cannot be marshaled.

I am brand new to .NET, so maybe this is a silly thing to post. I downloaded your BasicExport example and loaded it in Visual Studio to experiment with it. I could get the VB.net/C# .NET framework projects to display in the debug console properly, but the DotNotCore would not, erroring with "specified module could not be found".

After tinkering I saw that the DotNotCoreLibrary was not checked under dependencies. Checking that allowed it to debug properly. I don't know if I did something to mess that up, but figured I'd post it here just in case.