VBScriptEngine - Use of functions with optional parameters

[DanielGerlach2]

Code is executed via the VBScriptEngine, which in turn is supposed to call a function with optional parameters.
e.g.
List("[Value1]",,1)

Definition of function:
Public Function List(Field as String, Optional Field2 as String = "", Optional Count as Integer = 0)

The following error is then output:
The best match for the overloaded List(string, string, int) method contains some invalid arguments.

However, if I specify the default values ​​in the scritcode, the function call works
List("[Value1]","",1)

Is there a setting or option that needs to be set so that the call works correctly even without specifying the optional parameters?

[ClearScriptLib]

Hi @DanielGerlach2,

List("[Value1]",,1)

ClearScript uses the C# algorithm for binding call signatures to methods, and although both C# and VB.NET support optional parameters, neither language supports sparse arguments – that is, positional argument lists with one or more "gaps".

One way to make this work is to bypass the method binding phase by exposing List as a delegate-valued property rather than a method. We've verified that this works with C#. Unfortunately, VB.NET doesn't allow delegate types with optional parameters.

ClearScript also supports an alternate method binding scheme based on reflection, enabled via UseReflectionBindFallback or DisableDynamicBinding. Sadly, that algorithm currently doesn't work with sparse arguments either, but we'll fix that in the next release.

Thanks!

[DanielGerlach2]

Thank you very much for the quick answer.

Do you already have a timeline for the next release?

[ClearScriptLib]

We're tracking your feature request here.

Do you already have a timeline for the next release?

Unfortunately, no. ClearScript is a side project maintained by a very small group in their spare time. We're hoping to get version 7.5 out sometime in the next few weeks, but we can't provide precise release dates.