Windows Azure表存储中的批量删除

Question

我正在尝试删除两个日期之间的所有实体(即2个分区键)WADLogsTable.到目前为止,我发现的最好的代码是这个(来自http://wintellect.com/blogs/jlane/deleting-entities-in-windows-azure-table-storage):

private static void DeleteAllEntitiesInBatches(CloudTable table, Expression<Func<DynamicTableEntity, bool>> filters)
        {
            Action<IEnumerable<DynamicTableEntity>> processor = entities =>
            {
                var batches = new Dictionary<string, TableBatchOperation>();

                foreach (var entity in entities)
                {
                    TableBatchOperation batch = null;

                    if (batches.TryGetValue(entity.PartitionKey, out batch) == false)
                    {
                        batches[entity.PartitionKey] = batch = new TableBatchOperation();
                    }

                    batch.Add(TableOperation.Delete(entity));

                    if (batch.Count == 100)
                    {
                        table.ExecuteBatch(batch);
                        batches[entity.PartitionKey] = new TableBatchOperation();
                    }
                }

                foreach (var batch in batches.Values)
                {
                    if (batch.Count > 0)
                    {
                        table.ExecuteBatch(batch);
                    }
                }
            };

            ProcessEntities(table, processor, filters);
        }

        private static void ProcessEntities(CloudTable table, Action<IEnumerable<DynamicTableEntity>> processor, Expression<Func<DynamicTableEntity, bool>> filters)
        {
            TableQuerySegment<DynamicTableEntity> segment = null;

            while (segment == null || segment.ContinuationToken != null)
            {
                if (filters == null)
                {
                    segment = table.ExecuteQuerySegmented(new TableQuery().Take(100), segment == null ? null : segment.ContinuationToken);
                }
                else
                {
                    var query = table.CreateQuery<DynamicTableEntity>().Where(filters).Take(100).AsTableQuery();
                    segment = query.ExecuteSegmented(segment == null ? null : segment.ContinuationToken);
                }

                processor(segment.Results);
            }
        }

但我不知道我应该传递什么作为"过滤器"参数.我想出了这个相当天真的尝试:

Expression<Func<DynamicTableEntity, bool>> filters = e => long.Parse(e.PartitionKey) >= startTicks && long.Parse(e.PartitionKey) <= endTicks;

但这不起作用.在运行时,我收到以下错误:

表达式((Parse([10007] .PartitionKey)> = 635109048000000000)和(Parse([10007] .PartitionKey)<= 635115960000000000))不受支持.

我不知道我的问题是否与Azure表或Expression有关,但我们将不胜感激.

编辑:如果需要,我很乐意提供更多信息.

Answer 1

我在另一个论坛上得到了答案:

var startTicks = string.Format("{0:0000000000000000000}", start);
var endTicks = string.Format("{0:0000000000000000000}", end);
Expression<Func<DynamicTableEntity, bool>> filters = e => e.PartitionKey.CompareTo(startTicks) >= 0 && e.PartitionKey.CompareTo(endTicks) <= 0;