BudgetAnalyser.Engine.Services.TransactionManagerService.ValidateWithCurrentBudgetsAsync C# (CSharp) Method

        public async Task<bool> ValidateWithCurrentBudgetsAsync(BudgetCollection budgets = null)
        {
            // This method must be called at least once with a budget collection.  Second and subsequent times do not require the budget.
            if (this.budgetCollection == null && budgets == null)
            {
                throw new ArgumentNullException(nameof(budgets));
            }

            this.budgetCollection = budgets ?? this.budgetCollection;

            if (StatementModel == null)
            {
                // Can't check yet, statement hasn't been loaded yet. Everything is ok for now.
                return true;
            }

            if (this.budgetCollection.GetHashCode() == this.budgetHash)
            {
                // This budget has already been checked against this statement. No need to repeatedly check the validity below, this is an expensive operation.
                // Everything is ok.
                return true;
            }

            var allBuckets = new List<BudgetBucket>(this.bucketRepository.Buckets.OrderBy(b => b.Code));
            var allTransactionHaveABucket = await Task.Run(
                () =>
                {
                    return StatementModel.AllTransactions
                        .Where(t => t.BudgetBucket != null)
                        .AsParallel()
                        .All(
                            t =>
                            {
                                var bucketExists = allBuckets.Contains(t.BudgetBucket);
                                if (!bucketExists)
                                {
                                    t.BudgetBucket = null;
                                    this.logger.LogWarning(l => l.Format("Transaction {0} has a bucket ({1}) that doesn't exist!", t.Date, t.BudgetBucket));
                                }
                                return bucketExists;
                            });
                });

            this.budgetHash = this.budgetCollection.GetHashCode();
            return allTransactionHaveABucket;
        }