StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POThe LINQ expression node type 'ArrayIndex' is not supported in LINQ to Entities
primarykey
Id
8353948
data
AcceptedAnswerId
8354044
AnswerCount
6
ClosedDate
CommentCount
3
CommunityOwnedDate
CreationDate
2011-12-02T09:03:03.760
FavoriteCount
6
LastActivityDate
2018-08-03T14:16:51.417
LastEditDate
2018-03-08T12:32:18.990
LastEditorUserId
778056
OwnerUserId
750459
ParentId
0
PostTypeId
1
Score
50
ViewCount
27539
LastEditorDisplayName
text
Body
<pre><code>public List<string> GetpathsById(List<long> id) { long[] aa = id.ToArray(); long x; List<string> paths = new List<string>(); for (int i = 0; i < id.Count; i++) { x = id[i]; Presentation press = context.Presentations.Where(m => m.PresId == aa[i]).FirstOrDefault(); paths.Add(press.FilePath); } return paths; } </code></pre> This code throws the following exception: <code>The LINQ expression node type 'ArrayIndex' is not supported in LINQ to Entities.</code> However, if I supply <code>x</code> instead of <code>aa[i]</code> it works. Why?
Tags
<c#><arrays><linq><entity-framework><linq-to-entities>
Title
The LINQ expression node type 'ArrayIndex' is not supported in LINQ to Entities
singulars
PostAcceptedAnswerId
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USDavid Thompson
UserOwnerUserId
1. USArtur Keyan
plurals
PostLinksPostIdRelatedPostId
1. PL
 singulars
 LinkTypeLinkTypeId
 LTLinked
PostLinksRelatedPostIdPostId
1. PL
 singulars
 LinkTypeLinkTypeId
 LTLinked
2. PL
 singulars
 LinkTypeLinkTypeId
 LTLinked
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
2. PO
 singulars
 PostTypePostTypeId
 PTAnswer
3. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 POThe LINQ expression node type 'ArrayIndex' is not supported in LINQ to Entities
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
2. VO
 singulars
 PostPostId
 POThe LINQ expression node type 'ArrayIndex' is not supported in LINQ to Entities
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
3. VO
 singulars
 PostPostId
 POThe LINQ expression node type 'ArrayIndex' is not supported in LINQ to Entities
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
CommentsPostId

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.