How do I convert from IQueryable
to IEnumerable
? I looked at another post Get from IQueryable to IEnumerable but it's not generic enough to reuse? Can anyone provides a generic reusable way to do this?
public class SoftwareProductRepository
{
BitDatabaseEntities bitDB = new BitDatabaseEntities();
public IEnumerable<BuildMetrics> GetBuildMetrics()
{
var list = (from r in bitDB.bit_sanity_results select r);
return list;
}
}
Error message:
Cannot implictly converty type
'System.Linq.IQueryable<Dashboard.EntityFramework.bit_sanity_results>'
to'System.Collections.IEnumerable<Dashboard.Model.ApiModels.BuildMetrics>'
.An explicit conversion exists(are you missing a cast?)
Try converting queryable to enumerable with this:
(from r in bitDB.bit_sanity_results select r).AsEnumerable();
This will give you an enumerable collection but I think you may have to generate BuildMetrics
objects from bit_sanity_results
that are returned by this. Like:
(from r in bitDB.bit_sanity_results select new BuildMetrics{
<some BuildMetrics property>=r.<some bit_sanity_results property>
}).AsEnumerable();
Example
public class ReturnClass
{
public string SSId{get;set;}
public string Name{get;set;}
}
Table from which we select:
table values_store
(
ss_id varchar(50),
user_name varchar(250)
)
public class ReturnValuesRepository
{
public IEnumerable<ReturnClass> GetReturnClasses()
{
//As commented by @Enigmativity if your `BitDatabaseEntities` is `IDisposable` (sure if it inherits from `DbContext`) you should wrap it in a `using` block
using(var db = new ValuesEntities())
{
var list = (from r in db.values_store select new
ReturnClass
{
SSId=r.ss_id,
Name=r.user_name
}).AsEnumerable();
return list;
}
}
}
The conversion in this case should actually be implicit as IQueryable<T>
implements IEnumerable<T>
.
Your problem here is a type mismatch, as you are getting IQueryable<bit_sanity_results>
but are trying to return IEnumerable<BuildMetrics>
.
You'd need to project the IQueryable<bit_sanity_results>
to IEnumerable<BuildMetrics>
.
Something like this:
public class SoftwareProductRepository
{
BitDatabaseEntities bitDB = new BitDatabaseEntities();
public IEnumerable<BuildMetrics> GetBuildMetrics()
{
return bitDB.bit_sanity_results.Select(r => new BuildMetrics(...));
}
}
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