Now,Excel DNA can handle variable # of parameters (C# "paramArrayAttribute") Such as,
[ExcelFunction(Description = " ",IsVolatile=true)] public static object VI(params string[] optional) { return ""; }
The Excel-DNA Registration extension supports params registration and other type conversions: https://github.com/Excel-DNA/Registration
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The Excel-DNA Registration extension supports params registration and other type conversions: https://github.com/Excel-DNA/Registration