Just use the extension method Queryable.AsQueryable<T>()
.
How can I convert an ObjectResult<T> to IQueryable<T>?
-
02-12-2021 - |
Question
I'm using entity framework in an asp.net mvc 3.0 application. I'm using a table-valued function to do a full text search on one of my database tables. I have set the return type to an object of type Request. Then I feed the results into an expression builder that does a contains operation on the Requests from a list of entities that the user has access to. This is the code.
List<int> UserEntities = db.UserEntities
.Where(x => x.UserID.Equals(usr.ID))
.Select(x => x.EntityID).ToList();
var requests = db.SearchRequest(keyword)
.Where(BuildContainsExpression<Request, int>(x => x.EntityID, UserEntities));
//Expression Builder for Contains SQL functionality
static Expression<Func<TElement, bool>> BuildContainsExpression<TElement, TValue>(
Expression<Func<TElement, TValue>> valueSelector, IEnumerable<TValue> values)
{
if (null == valueSelector) { throw new ArgumentNullException("valueSelector"); }
if (null == values) { throw new ArgumentNullException("values"); }
ParameterExpression p = valueSelector.Parameters.Single();
// p => valueSelector(p) == values[0] || valueSelector(p) == ...
if (!values.Any())
{
return e => false;
}
var equals = values.Select(
value => (Expression)Expression.Equal(
valueSelector.Body,
Expression.Constant(value, typeof(TValue))));
var body = equals.Aggregate<Expression>(
(accumulate, equal) => Expression.Or(accumulate, equal));
return Expression.Lambda<Func<TElement, bool>>(body, p);
}
The second line will not build. The compiler is telling me that the SearchRequest procedure is returning ObjectResult but needs IQueryable. How to I convert the ObjectResult to IQueryable?
Solution
OTHER TIPS
Add the line
using System.Linq
and the extension methods will be available.
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