正在使用仅具有所需属性(相当于投影查询)的TableEntity

我有一系列由TableEntity表示的Report。它有许多不同的属性，但通常，我只需要ReportID属性。

public class ReportEntity : TableEntity
{
    public ReportIDEntity()
    {}
    internal ReportIDEntity(Guid reportID, .../*other properties*/)
    {
        ReportID = reportID;
        //assign other properties
    }
    public Guid ReportID { get; set; }
    //other properties
}

我为此编写了一个投影查询，这样我就不必检索整个实体来获取ID:

const String __ID_COLUMN = "ReportID"; //yuck
IEnumerable<Guid> ids =
_cloudTable_.ExecuteQuery(
new TableQuery<DynamicTableEntity>().Where(
    TableQuery.GenerateFilterCondition(
        "PartitionKey", QueryComparisons.Equal, partitionKey))
    .Select(new[] { __ID_COLUMN }),
    (key, rowKey, timestamp, properties, etag) => properties[__ID_COLUMN].GuidValue.Value);

但是，这很难看(我需要将属性名指定为字符串来检索它，而且代码很长)。

如果我做一个只有ReportID属性的TableEntity，并查询它呢?这将检索所有的数据，还是会像投影查询一样精简(带宽方面)?

public class ReportIDEntity : TableEntity
{
    public ReportIDEntity()
    {}
    internal ReportIDEntity(Guid reportID)
    {
        ReportID = reportID;
    }
    public Guid ReportID { get; set; }
}
public class ReportEntity : ReportIDEntity
{
    public ReportEntity()
    {}
    internal ReportEntity(Guid reportID, .../*other properties*/)
     : base(reportID)
    {
        //assign other properties
    }
    //other properties
}

然后查询将是:

IEnumerable<Guid> reportEntities =
_cloudTable_.ExecuteQuery(
new TableQuery<ReportIDEntity>().Where(
    TableQuery.GenerateFilterCondition(
        "PartitionKey", QueryComparisons.Equal, partitionKey)))
.Select(e => e.ReportID);