"There is no method 'Filter' on type 'Sitecore.ContentSearch.Linq.QueryableExtensions' that matches..."

Question

I'm re-posting because the other thread on with 'GetResults' instead of 'Filter' SOLR error message is in a different context. This thread was when migrating from 8.1 to 8.2, while we are migrating for 9 which already includes the patch.

So, for a search code that was working well on our 8.1, the same code on 9 is now producting this error:

ManagedPoolThread #8 17:00:23 ERROR There is no method 'Filter' on type 'Sitecore.ContentSearch.Linq.QueryableExtensions' that matches the specified arguments
Exception: System.InvalidOperationException
Message: There is no method 'Filter' on type 'Sitecore.ContentSearch.Linq.QueryableExtensions' that matches the specified arguments
Source: System.Core
   at System.Linq.EnumerableRewriter.FindMethod(Type type, String name, ReadOnlyCollection`1 args, Type[] typeArgs, BindingFlags flags)
   at System.Linq.EnumerableRewriter.VisitMethodCall(MethodCallExpression m)
   at System.Linq.Expressions.OldExpressionVisitor.VisitExpressionList(ReadOnlyCollection`1 original)
   at System.Linq.EnumerableRewriter.VisitMethodCall(MethodCallExpression m)
   at System.Linq.Expressions.OldExpressionVisitor.VisitExpressionList(ReadOnlyCollection`1 original)
   at System.Linq.EnumerableRewriter.VisitMethodCall(MethodCallExpression m)
   at System.Linq.Expressions.OldExpressionVisitor.VisitExpressionList(ReadOnlyCollection`1 original)
   at System.Linq.EnumerableRewriter.VisitMethodCall(MethodCallExpression m)
   at System.Linq.Expressions.OldExpressionVisitor.VisitExpressionList(ReadOnlyCollection`1 original)
   at System.Linq.EnumerableRewriter.VisitMethodCall(MethodCallExpression m)
   at System.Linq.Expressions.OldExpressionVisitor.VisitExpressionList(ReadOnlyCollection`1 original)
   at System.Linq.EnumerableRewriter.VisitMethodCall(MethodCallExpression m)
   at System.Linq.Expressions.OldExpressionVisitor.VisitExpressionList(ReadOnlyCollection`1 original)
   at System.Linq.EnumerableRewriter.VisitMethodCall(MethodCallExpression m)
   at System.Linq.EnumerableExecutor`1.Execute()
   at Sitecore.ContentSearch.Linq.QueryableExtensions.GetResults[TSource](IQueryable`1 source)

Thank you

PS: code example:

private IEnumerable<SearchManagerResultItem> generateResults(int pageNumber, out int totalResultCount)
        {
            var srchQuery = this.OnGetInitialQuery();

            // Query additions
            srchQuery = this.OnAddQueryBaseConditions(srchQuery);
            srchQuery = this.OnAddQuerySearchTerm(srchQuery);
            srchQuery = this.OnAddQueryLocations(srchQuery);
            srchQuery = this.OnAddQueryTemplates(srchQuery);
            srchQuery = this.OnAddQueryExcludedIDs(srchQuery);
            srchQuery = this.OnAddQueryDynamicFilters(srchQuery);
            srchQuery = this.OnAddQuerySorting(srchQuery);

            // Get the results
            pageNumber = pageNumber < 0 ? 0 : pageNumber;
            var srchResults = srchQuery.Page(pageNumber, this.PageSize).GetResults();

And the Visual Studio F12 "Go to definition" on srchQuery.Page

using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Runtime.CompilerServices;

namespace Sitecore.ContentSearch.Linq
{
    public static class QueryableExtensions
    {
        public static IQueryable<TSource> FacetOn<TSource, TKey>(this IQueryable<TSource> source, Expression<Func<TSource, TKey>> keySelector);
        public static IQueryable<TSource> FacetOn<TSource, TKey>(this IQueryable<TSource> source, Expression<Func<TSource, TKey>> keySelector, int minimumResultCount);
        public static IQueryable<TSource> FacetOn<TSource, TKey>(this IQueryable<TSource> source, Expression<Func<TSource, TKey>> keySelector, int minimumResultCount, IEnumerable<object> filterValues);
        public static IQueryable<TSource> FacetPivotOn<TSource>(this IQueryable<TSource> source, Expression<Func<FacetPivotQuery<TSource>, FacetPivotQuery<TSource>>> keySelector);
        public static IQueryable<TSource> FacetPivotOn<TSource>(this IQueryable<TSource> source, Expression<Func<FacetPivotQuery<TSource>, FacetPivotQuery<TSource>>> keySelector, int minimumResultCount);
        public static IQueryable<TSource> Filter<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, bool>> predicate);
        public static FacetResults GetFacets<TSource>(this IQueryable<TSource> source);
        public static SearchResults<TSource> GetResults<TSource>(this IQueryable<TSource> source);
        public static SearchResults<TSource> GetResults<TSource>(this IQueryable<TSource> source, GetResultsOptions options);
        public static IQueryable<TSource> Page<TSource>(this IQueryable<TSource> source, int page, int pageSize);
        public static IQueryable<TOuter> SelfJoin<TOuter, TInner, TKey>(this IQueryable<TOuter> outer, IEnumerable<TInner> inner, Expression<Func<TOuter, TKey>> outerKeySelector, Expression<Func<TInner, TKey>> innerKeySelector);
        public static IEnumerable<TSource> Stream<TSource>(this IQueryable<TSource> source);
        public static IEnumerable<TSource> Stream<TSource>(this IQueryable<TSource> source, int pageSize);
    }
}

Answer 1

I ran into this same issue the other day. The cause of the issue is the same as in the GetResults thread. Solr needs to be running before you start Sitecore. Just do an iisreset to resolve the problem.