Calling C# function from VBScript function in Web UI

Question

I need to call or at least pass parameters into C# function from within VBScript function (or suitable workaround) on Microsoft Azure Website Hosting i.e.:

Function VBScriptFnc(param_1, param_2, param_3)

  Dim flag;

  flag = 1

    'call the C# function or somehow pass parameters into C# function'
    csharpFunction(param_1, param_2, param_3)


  VBScriptFnc = flag

End Function

Answer 1

VBScript has 5 windows into the .NET world:

1. By doing HTTP POST/GET to a .NET handler of some kind (such as a .aspx, HTTP handler, MVC or WebAPI controller).
2. By writing data to a file or a database for a .NET process to pick up.
3. By exposing a .NET assembly (class library) as a COM object and adding the appropriate entries in the Windows Registry (either manually or using command utilities) so it can be called directly from VBScript. See this article.
4. Making an executable file with .NET that is run directly from VBScript.
5. Using PowerShell to call into a .NET assembly and using VBScript to call PowerShell.

The most straightforward option on a website is to use a GET or POST because you will steer clear of the mine fields of ACL and COM registration, but if you must go down another road I would say that PowerShell is your best bet, followed by COM interop as a third choice.