属性 table 存储中通过 C# 访问的实体的值为零

Question

我有一个 table 存储设备，用于存储设备 ID、时间戳和 pm1。我尝试使用 C# 访问具有特定设备 ID 和特定时间范围的实体。我能够得到我想要的实体，但这些实体的 pm1 读数为零，这是不正确的。 table 存储中没有丢失 pm1 读数。我该如何解决？

这是我的代码：

main():
    string partitionFilter = TableQuery.GenerateFilterCondition("deviceid", QueryComparisons.Equal, StartEntity.deviceid);
            string date1 = TableQuery.GenerateFilterConditionForDate("ts", QueryComparisons.GreaterThanOrEqual,starttime);
            string date2 = TableQuery.GenerateFilterConditionForDate("ts", QueryComparisons.LessThanOrEqual, endtime);
            string datefilter = TableQuery.CombineFilters(date1, TableOperators.And, date2);
            string pm1con = TableQuery.GenerateFilterConditionForInt("pm1con", QueryComparisons.GreaterThan, 0);
            string finalFilter = TableQuery.CombineFilters(partitionFilter,TableOperators.And, datefilter);
            string extrafilter = TableQuery.CombineFilters(finalFilter, TableOperators.And, pm1con);
            TableQuery<EventEntity> RangeQueryforEnentEntities = new TableQuery<EventEntity>().Where(extrafilter);
            TableContinuationToken token = null;

            do
            {
                TableQuerySegment<EventEntity> resultSegment = EventsTable.ExecuteQuerySegmented(RangeQueryforEnentEntities, token);
                token = resultSegment.ContinuationToken;

                foreach (EventEntity entity in resultSegment.Results)
                {
                    EventEntities.Add(entity);
                    log.Info($"C# All the entities in current event: {entity.deviceid}, {entity.ts}, {entity.PM1Con}");
                }

            } while (token != null);

            return EventEntities; 

public class EventEntity : TableEntity
{
    public EventEntity(string deviceid, DateTime ts, int PM1Con, float TumblingB_threshold, float TumblingB_confidence)
    {
        this.PartitionKey = deviceid;
        this.RowKey = ts.ToLongDateString();
    }

    public EventEntity() { }

    public string deviceid { get; set; }

    public DateTime ts { get; set; }

    public float pm1con { get; set; }

    public float TumblingB_threshold { get; set; }

    public float TumblingB_confidence { get; set; }

}

这是 returned 结果：

[2017-11-08 5:25:59 PM] C# All the entities in current event: HAVEN-0D0E0A-TZ-000115, 2017-10-25 2:42:00 AM, 0
[2017-11-08 5:25:59 PM] C# All the entities in current event: HAVEN-0D0E0A-TZ-000115, 2017-10-25 2:45:00 AM, 0
[2017-11-08 5:25:59 PM] C# All the entities in current event: HAVEN-0D0E0A-TZ-000115, 2017-10-25 2:51:00 AM, 0
[2017-11-08 5:25:59 PM] C# All the entities in current event: HAVEN-0D0E0A-TZ-000115, 2017-10-25 2:54:00 AM, 0
[2017-11-08 5:25:59 PM] C# All the entities in current event: HAVEN-0D0E0A-TZ-000115, 2017-10-25 2:57:00 AM, 0
[2017-11-08 5:25:59 PM] C# All the entities in current event: HAVEN-0D0E0A-TZ-000115, 2017-10-25 3:00:00 AM, 0
[2017-11-08 5:25:59 PM] C# All the entities in current event: HAVEN-0D0E0A-TZ-000115, 2017-10-25 3:03:00 AM, 0
[2017-11-08 5:25:59 PM] C# All the entities in current event: HAVEN-0D0E0A-TZ-000115, 2017-10-25 3:06:00 AM, 0
[2017-11-08 5:25:59 PM] C# All the entities in current event: HAVEN-0D0E0A-TZ-000115, 2017-10-25 3:09:00 AM, 0
[2017-11-08 5:25:59 PM] C# All the entities in current event: HAVEN-0D0E0A-TZ-000115, 2017-10-25 3:12:00 AM, 0
[2017-11-08 5:25:59 PM] C# All the entities in current event: HAVEN-0D0E0A-TZ-000115, 2017-10-25 3:15:00 AM, 0
[2017-11-08 5:25:59 PM] C# All the entities in current event: HAVEN-0D0E0A-TZ-000115, 2017-10-25 3:18:00 AM, 0

这是我想要的结果：

如您所见，return pm1con 值是错误的。

Answer 1

使用 entity.pm1con 代替 entity.PM1Con。

table 实体转换区分大小写。

Answer 2

问题与数据类型有关。我使用 float 作为 pm1con 数据类型，但我应该使用 double.

属性 table 存储中通过 C# 访问的实体的值为零

property values of entities in table storage accessed through C# are zero

c#

azure-table-storage