public Either <RfcErrorInfo, int> GetFunctionParameterCount(IFunctionDescriptionHandle descriptionHandle) { Logger.IfSome(l => l.LogTrace("reading function parameter count by function description handle", descriptionHandle)); var rc = NativeApi.GetFunctionParameterCount(descriptionHandle as FunctionDescriptionHandle, out var result, out var errorInfo); return(ResultOrError(result, rc, errorInfo)); }