Disco.Services.DocumentTemplatePackageExtensions.EvaluateOnGenerateExpression C# (CSharp) Method

        public static string EvaluateOnGenerateExpression(this DocumentTemplatePackage package, object Data, DiscoDataContext Database, User User, DateTime TimeStamp, DocumentState State)
        {
            if (!string.IsNullOrEmpty(package.OnGenerateExpression))
            {
                Expression compiledExpression = package.OnGenerateExpressionFromCache();
                System.Collections.IDictionary evaluatorVariables = Expression.StandardVariables(null, Database, User, TimeStamp, State);
                evaluatorVariables.Add("Package", package);
                try
                {
                    object result = compiledExpression.EvaluateFirst<object>(Data, evaluatorVariables);
                    return result.ToString();
                }
                catch
                {
                    throw;
                }
            }
            return null;
        }