Question

我有一个方法，用于根据用户在选择列表中选择的选项生成摘要报告，以计算在某个区域内完成的测试类型的数量，以及日期内的子集位置范围。

以下是数据的样子：按位置完成测试计数 2015年1月1日至2015年3月1日

Total  TestType  Location  Region  Division
455    24 Hour   Lab 1     City 1  Division A
28     24 Hour   Lab 2     City 1  Division A
95     24 Hour   Clinic Z  City 2  Division A
189    24 Hour   Clinic Y  City 2  Division A

以下是同一时期不同测试类型的外观：

Total  TestType  Location  Region  Division
285    48 Hour   Lab 1     City 1  Division A
12     48 Hour   Lab 2     City 1  Division A
75     48 Hour   Clinic Z  City 2  Division A
106    48 Hour   Clinic Y  City 2  Division A

现在，用户希望在一个报告中看到testType的摘要细分（在SQL中，向组中添加另一个属性）。在我的testTypeId选择列表中，我使用0作为我的“全部”项目。在一个完美的世界中，如果IQueryable我还有testTypeId == 0的另一个补充，这样我就可以保留相同的私有方法，而不是编写新的查询。

以下是我们希望数据在“ALL”情况下的样子：

Total  TestType  Location  Region  Division
455    24 Hour   Lab 1     City 1  Division A
285    48 Hour   Lab 1     City 1  Division A
59     12 Lead   Lab 1     City 1  Division A
28     24 Hour   Lab 2     City 1  Division A
12     48 Hour   Lab 2     City 1  Division A
95     24 Hour   Clinic Z  City 2  Division A
75     48 Hour   Clinic Z  City 2  Division A
5      12 Lead   Clinic Z  City 2  Division A
189    24 Hour   Clinic Y  City 2  Division A
106    48 Hour   Clinic Y  City 2  Division A
8      12 Lead   Clinic Y  City 2  Division A

下面的示例显示了我想要添加的内容，但语法告诉我，我不能将IQueryable包含IGrouping并将其转换为目标类型IQueryable。

有人能指出我在这方面的好方向吗？

private CompletedCountReport GetCompletedCountsByRegion(int regionId, DateTime? startDate, DateTime? endDate, int testTypeId)
{
    var ccRpt = new CompletedCountReport { CompletedCounts = new List<CompletedCount>(), StartDate = startDate, EndDate = endDate, SelectedRegionID = regionId};

    var query = HolterTestDao.FindAll(new GetCompletedByRegionIdAndDates(regionId, startDate.Value, endDate.Value));

    // a specific test type was selected
    if (testTypeId > 0)
    {
        query = query.Where(x => x.HolterTestType == testTypeId);
    }
    // THIS IS WHAT I WANT TO ADD -> otherwise group by test type  <-  THIS IS WHAT I WANT TO ADD.
    if (testTypeId == 0)
    {
        query = query.GroupBy(x => x.HolterTestType);
    }
    // order by locationID within the region.
    query = query.OrderBy(x => x.Location.ID);

    var htList = query.ToList();

    // now Group by Location, to get counts. 
    var reportContents = htList.GroupBy(x => x.Location.ID);
    foreach (var r in reportContents)
    {
        var rList = r.ToList();

        var cc = new CompletedCount();
        var loc = LocationDao.FindById(r.Key);
        cc.Description = loc.Description;
        cc.RegionId = loc.Region.ID;
        cc.DivisionId = loc.Region.Division.ID;
        cc.TestTypeId = testTypeId;
        cc.Count = rList.Count;
        ccRpt.CompletedCounts.Add(cc);
    }

    return ccRpt;
}

Answer 1

我的解决方案是OrderBy Location和HolterTestType，然后是基本内容的GroupBy位置，然后在我的循环中通过结果添加另一个分组以按测试类型获取计数：

        query = query.OrderBy(x => x.Location.ID).ThenBy(x => x.HolterTestType);
        var htList = query.ToList();

        // now Group by Location. 
        var reportContents = htList.GroupBy(x => x.Location.ID);

        foreach (var r in reportContents)
        {
            //Group by TestType, to get counts.
            var t = r.GroupBy(x => x.HolterTestType);
            var tList = t.ToList();

            foreach(var u in tList)
            {
                var cc = new CompletedCount();
                var loc = LocationDao.FindById(r.Key);
                cc.Description = loc.Description;
                cc.RegionId = loc.Region.ID;
                cc.DivisionId = loc.Region.Division.ID;
                cc.TestTypeId = u.Key;
                cc.Count = u.Count();
                ccRpt.CompletedCounts.Add(cc);
            }
        }

Lambda Linq Iqueryable组 - 添加另一个分组

1 个答案: