Amazon.DynamoDBv2.DocumentModel.Table.DeleteHelper C# (CSharp) Method

        internal Document DeleteHelper(Key key, DeleteItemOperationConfig config, bool isAsync)
        {
            var currentConfig = config ?? new DeleteItemOperationConfig();

            var req = new DeleteItemRequest
            {
                TableName = TableName,
                Key = key
            };
            ((Amazon.Runtime.Internal.IAmazonWebServiceRequest)req).AddBeforeRequestHandler(isAsync ?
                new RequestEventHandler(UserAgentRequestEventHandlerAsync) :
                new RequestEventHandler(UserAgentRequestEventHandlerSync)
                );
            if (currentConfig.ReturnValues == ReturnValues.AllOldAttributes)
                req.ReturnValues = EnumMapper.Convert(currentConfig.ReturnValues);

            ValidateConditional(currentConfig);

            if (currentConfig.Expected != null)
            {
                req.Expected = currentConfig.Expected.ToExpectedAttributeMap(Conversion);
            }
            else if (currentConfig.ExpectedState != null &&
                currentConfig.ExpectedState.ExpectedValues != null &&
                currentConfig.ExpectedState.ExpectedValues.Count > 0)
            {
                req.Expected = currentConfig.ExpectedState.ToExpectedAttributeMap(Conversion);
                if (req.Expected.Count > 1)
                    req.ConditionalOperator = EnumMapper.Convert(currentConfig.ExpectedState.ConditionalOperator);
            }
            else if (currentConfig.ConditionalExpression != null && currentConfig.ConditionalExpression.IsSet)
            {
                currentConfig.ConditionalExpression.ApplyExpression(req, this.Conversion);
            }

            var attributes = DDBClient.DeleteItem(req).Attributes;

            Document ret = null;
            if (currentConfig.ReturnValues == ReturnValues.AllOldAttributes)
            {
                ret = Document.FromAttributeMap(attributes);
            }
            return ret;
        }