We have developed a library for delphi to call .net, it’s called DDNRuntime.
This library is tested with aspose SDK for .net.
Should this link be added to your .net page.
I believe this will extend your customers from delphi.
DDNRuntime Features No need for COM support. It is very simple to use, just declare the type and method of .NET in Delphi. Dedicated translation tool, input one or more .NET assembly DLL, output one or two Delphi import units. Support interface types (including generic interface). Support dynamic array (one-dimensional array). Support Delegate type. Support Event.