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plurals

PO
primarykey
Id
5199815
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
2
CommunityOwnedDate
CreationDate
2011-03-04T22:04:41.767
FavoriteCount
0
LastActivityDate
2011-03-04T22:14:23.963
LastEditDate
2011-03-04T22:14:23.963
LastEditorUserId
352552
OwnerUserId
352552
ParentId
5199576
PostTypeId
2
Score
2
ViewCount
0
LastEditorDisplayName
text
Body
<p>I think this will yield what you're looking for:</p> <pre><code>public class InstanceInformation { public string PatientID { get; set; } public string StudyID { get; set; } public string SeriesID { get; set; } public string InstanceID { get; set; } public override string ToString() { return String.Format("Series = {0} Study = {1} Patient = {2}", SeriesID, StudyID, PatientID); } } class Program { static void Main(string[] args) { List<InstanceInformation> infos = new List<InstanceInformation>() { new InstanceInformation(){ SeriesID = "A", StudyID = "A1", PatientID = "P1" }, new InstanceInformation(){ SeriesID = "A", StudyID = "A1", PatientID = "P1" }, new InstanceInformation(){ SeriesID = "A", StudyID = "A1", PatientID = "P2" }, new InstanceInformation(){ SeriesID = "A", StudyID = "A2", PatientID = "P1" }, new InstanceInformation(){ SeriesID = "B", StudyID = "B1", PatientID = "P1"}, new InstanceInformation(){ SeriesID = "B", StudyID = "B1", PatientID = "P1"}, }; IEnumerable<IGrouping<string, InstanceInformation>> bySeries = infos.GroupBy(g => g.SeriesID); IEnumerable<IGrouping<string, InstanceInformation>> byStudy = bySeries.SelectMany(g => g.GroupBy(g_inner => g_inner.StudyID)); IEnumerable<IGrouping<string, InstanceInformation>> byPatient = byStudy.SelectMany(g => g.GroupBy(g_inner => g_inner.PatientID)); foreach (IGrouping<string, InstanceInformation> group in byPatient) { Console.WriteLine(group.Key); foreach(InstanceInformation II in group) Console.WriteLine(" " + II.ToString()); } } </code></pre>
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1. This table or related slice is empty.
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1. PONested LINQ Query Question
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  PTQuestion
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1. PTAnswer
UserLastEditorUserId
1. USAdam Rackis
UserOwnerUserId
1. USAdam Rackis
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1. COThis is not a real groupby (because you group, then reflatten all), but something more similar to an `OrderBy().ThenBy().ThenBy()...`
  singulars
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  USdigEmAll
2. COYou're right. It does yield the groups he looking for though. Depending on how he wants to retrieve the data he might want your solution
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  USAdam Rackis

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