Databases
StackOverflow2013
Postsdbo
PODynamic + linq compilation error
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PODynamic + linq compilation error
    primarykey
    data
    text
    <p>I'll say up front that I am doing some really scary things with linq on dynamic data. But I can't figure out why this query fails to compile:</p> <p>Error 1 The property '&lt;>h__TransparentIdentifier0' cannot be used with type arguments</p> <pre> public class Program { public static void Main(string[] args) { var docs = new dynamic[0]; var q = from doc in docs where doc["@metadata"]["Raven-Entity-Name"] == "Cases" where doc.AssociatedEntities != null from entity in doc.AssociatedEntities where entity.Tags != null // COMPILER ERROR HERE from tag in entity.Tags where tag.ReferencedAggregate != null select new {tag.ReferencedAggregate.Id, doc.__document_id}; } } public static class LinqOnDynamic { private static IEnumerable&lt;dynamic&gt; Select(this object self) { if (self == null) yield break; if (self is IEnumerable == false || self is string) throw new InvalidOperationException("Attempted to enumerate over " + self.GetType().Name); foreach (var item in ((IEnumerable) self)) { yield return item; } } public static IEnumerable&lt;dynamic&gt; SelectMany(this object source, Func&lt;dynamic, int, IEnumerable&lt;dynamic&gt;&gt; collectionSelector, Func&lt;dynamic, dynamic, dynamic&gt; resultSelector) { return Enumerable.SelectMany(Select(source), collectionSelector, resultSelector); } public static IEnumerable&lt;dynamic&gt; SelectMany(this object source, Func&lt;dynamic, IEnumerable&lt;dynamic&gt;&gt; collectionSelector, Func&lt;dynamic, dynamic, dynamic&gt; resultSelector) { return Enumerable.SelectMany(Select(source), collectionSelector, resultSelector); } public static IEnumerable&lt;dynamic&gt; SelectMany(this object source, Func&lt;object, IEnumerable&lt;dynamic&gt;&gt; selector) { return Select(source).SelectMany&lt;object, object&gt;(selector); } public static IEnumerable&lt;dynamic&gt; SelectMany(this object source, Func&lt;object, int, IEnumerable&lt;dynamic&gt;&gt; selector) { return Select(source).SelectMany&lt;object, object&gt;(selector); } } </pre> <p>To add insult to injury, the following works:</p> <pre> var docs = new dynamic[0]; var q = from doc in docs where doc["@metadata"]["Raven-Entity-Name"] == "Cases" where doc.AssociatedEntities != null from entity in doc.AssociatedEntities where entity.Tags != null from tag in entity.Tags select new { tag.ReferencedAggregate.Id, doc.__document_id }; </pre> <p>It is only when I add:</p> <p>where tag.ReferencedAggregate != null</p> <p>That I get an error two lines before:</p> <p>where entity.Tags != null // COMPILER ERROR HERE</p> <p>Not sure what is going on</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USAyende Rahien
    1. USAyende Rahien
    plurals
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. PODynamic + linq compilation error
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PODynamic + linq compilation error
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PODynamic + linq compilation error
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

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.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload