How to Create DLL in C# and call in Delphi XE6 [duplicate]

Answer 1

A C# DLL is a managed assembly and does not export its functionality via classic PE exports. Your options:

1. Use C++/CLI mixed mode to wrap the C#. You can then export functions in unmanaged mode in the usual way.
2. Use Robert Giesecke's UnmanagedExports. This is perhaps more convenient than a C++/CLI wrapper.
3. Expose the managed functionality as a COM object.

Once you get as far as choosing one of these options you will have to deal with your misuse of the string data type. That's a private Delphi data type that is not valid for interop. For the simple example in the question PWideChar would suffice.