StackOverflow2013

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plurals

PO
primarykey
Id
19453756
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-10-18T15:47:28.243
FavoriteCount
0
LastActivityDate
2013-10-18T15:47:28.243
LastEditDate
2017-05-23T12:15:48.897
LastEditorUserId
-1
OwnerUserId
659190
ParentId
19451983
PostTypeId
2
Score
0
ViewCount
0
LastEditorDisplayName
text
Body
As an alternative to <a href="https://stackoverflow.com/a/19452273/659190">Servy's answer</a>, which I find more elegant and obviously much more resuable, You could do something more bespoke in one sweep (after ordering.) <pre><code> public class ContiguousValuePeriod<TValue> { private readonly DateTime start; private readonly DateTime end; private readonly TValue value; public ContiguousValuePeriod( DateTime start, DateTime end, TValue value) { this.start = start; this.end = end; this.value = value; } public DateTime Start { get { return this.start; } } public DateTime End { get { return this.start; } } public TValue Value { get { return this.value; } } } public IEnumerable<ContiguousValuePeriod<TValue>> GetContiguousValuePeriods<TValue, TItem>( this IEnumerable<TItem> source, Func<TItem, DateTime> dateSelector, Func<TItem, TValue> valueSelector) { using (var iterator = source .OrderBy(t => valueSelector(t)) .ThenBy(t => dateSelector(t)) .GetEnumerator()) { if (!iterator.MoveNext()) { yield break; } var periodValue = valueSelector(iterator.Current); var periodStart = dateSelector(iterator.Current); var periodLast = periodStart; var hasTail = false; while (iterator.MoveNext()) { var thisValue = valueSelector(iterator.Current); var thisDate = dateSelector(iterator.Current); if (!thisValue.Equals(periodValue) || thisDate.Subtract(periodLast).TotalDays > 1.0) { // Period change yield return new ContiguousValuePeriod( periodStart, periodLast, periodValue); periodStart = thisDate; periodValue = thisValue; hasTail = false; } else { hasTail = true; } periodLast = thisDate; } } if (hasTail) { yield return new ContiguousValuePeriod( periodStart, periodLast, periodValue); } } </code></pre> which you use like, <pre><code>var result = yourList.GetContiguousValuePeriods( a => a.Date, a => a.Price); </code></pre>
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Title
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PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POGetting grouped date range using linq
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 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USCommunity
UserOwnerUserId
1. USJodrell
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PostLinksRelatedPostIdPostId
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PostsAcceptedAnswerId
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PostsParentIdCreationDate
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