Roslyn VisualBasic.ScriptEngine doesnt recognize hostObject written on C#

Question

Our project need ability to have a simple business rules our customers can script in Visual basic. While our main program is written on C# The script which customers want to execut could be like this (I am considering the simpliest possible case) ``` var vbCode = @" If (Row.Code = 12) Then Row.MappedCode = 1 End If"; ``` So I created a RowData class in C# with Code and MappedCode properties ``` namespace ScriptModel { public class RowData { public int Code { get; set; } public int MappedCode { get; set; } } } ``` I created a simple host object class like ``` namespace ScriptModel { public class HostObjectModel { public RowData Row { get; set; } } } ``` Using Roslyn.Scripting.VisualBasic.ScriptEngine I create an engine, create a session with an instance of HostObjectModel and perform engine.Execute(vbCode, session) ``` var hostObj = new HostObjectModel(); hostObj.Row = new RowData(); hostObj.Row.Code = 12; var engine = new Roslyn.Scripting.VisualBasic.ScriptEngine( new Assembly[] {host…

Accepted Answer

For VB scripting I found you have to include the following at the start of the script:

```
Imports ScriptModel
```

I guess you could automatically pre-pend the above to the code string so your users don't need to remember to include it.

I have not been able to get it to work when added as part of the ScriptEngine creation. It also doesn't seem to work afterwards by using:

```
engine.ImportedNamespaces.Append("ScriptModel");
```

This is despite the fact that afterwards the ImportedNamespaces count is 1. With c# you don't seem to need to import the namespace at all.

Roslyn VisualBasic.ScriptEngine doesnt recognize hostObject written on C#

Solution

Problem