extracted alot of things in the base class. :)

PoweredSoft.DynamicLinq/Fluent/QueryBuilder.cs

@@ -9,90 +9,17 @@ using System.Threading.Tasks;
 
 namespace PoweredSoft.DynamicLinq.Fluent
 {
-    public class QueryBuilder<T>
+    public class QueryBuilder<T> : QueryBuilderBase
     {
         public IQueryable<T> Query { get; set; }
 
         public Type QueryableType { get; set; }
        
-        public bool IsNullCheckingEnabled { get; protected set; } = false;
-
-        public List<QueryBuilderFilter> Filters { get; protected set; } = new List<QueryBuilderFilter>();
-
-        public List<QueryBuilderSort> Sorts { get; protected set; } = new List<QueryBuilderSort>();
-
         public QueryBuilder(IQueryable<T> query)
         {
             Query = query;
         }
 
-        public QueryBuilder<T> NullChecking(bool check = true)
-        {
-            IsNullCheckingEnabled = check;
-            return this;
-        }
-
-        public virtual QueryBuilder<T> Compare(string path, ConditionOperators conditionOperators, object value, 
-            QueryConvertStrategy convertStrategy = QueryConvertStrategy.ConvertConstantToComparedPropertyOrField, 
-            bool and = true, QueryCollectionHandling collectionHandling = QueryCollectionHandling.Any)
-        {
-            Filters.Add(new QueryBuilderFilter
-            {
-                And = and,
-                ConditionOperator = conditionOperators,
-                Path = path,
-                Value = value,
-                ConvertStrategy = convertStrategy,
-                CollectionHandling = collectionHandling
-            });
-
-            return this;
-        }
-
-        public virtual QueryBuilder<T> Sort(string path, SortOrder sortOrder, bool appendSort)
-        {
-            Sorts.Add(new QueryBuilderSort
-            {
-                Path = path,
-                SortOrder = sortOrder,
-                AppendSort = appendSort
-            });
-            return this;
-        }
-
-        public virtual QueryBuilder<T> SubQuery(Action<QueryBuilder<T>> subQuery, bool and = true)
-        {
-            // create query builder for same type.
-            var qb = new QueryBuilder<T>(Query);
-            qb.NullChecking(IsNullCheckingEnabled);
-
-            // callback.
-            subQuery(qb);
-            
-            // create a query part.
-            var part = new QueryBuilderFilter();
-            part.And = and;
-            part.Filters = qb.Filters;
-            Filters.Add(part);
-            
-            //return self.
-            return this;
-        }
-
-        public QueryBuilder<T> And(string path, ConditionOperators conditionOperator, object value, 
-            QueryConvertStrategy convertStrategy = QueryConvertStrategy.ConvertConstantToComparedPropertyOrField, QueryCollectionHandling collectionHandling = QueryCollectionHandling.Any)
-            => Compare(path, conditionOperator, value, convertStrategy: convertStrategy, collectionHandling: collectionHandling, and: true);
-
-        public QueryBuilder<T> Or(string path, ConditionOperators conditionOperator, object value, 
-            QueryConvertStrategy convertStrategy = QueryConvertStrategy.ConvertConstantToComparedPropertyOrField, QueryCollectionHandling collectionHandling = QueryCollectionHandling.Any)
-            => Compare(path, conditionOperator, value, convertStrategy: convertStrategy, collectionHandling: collectionHandling, and: false);
-
-        public QueryBuilder<T> And(Action<QueryBuilder<T>> subQuery)
-            => SubQuery(subQuery, true);
-
-        public QueryBuilder<T> Or(Action<QueryBuilder<T>> subQuery)
-            => SubQuery(subQuery, false);
-
         public virtual IQueryable<T> Build()
         {
             // the query.
@@ -225,5 +152,10 @@ namespace PoweredSoft.DynamicLinq.Fluent
 
             return ret;
         }
+
+        protected override QueryBuilderBase GetSubQueryBuilder()
+        {
+            return new QueryBuilder<T>(Query);
+        }
     }
 }

PoweredSoft.DynamicLinq/Fluent/QueryBuilderBase.cs

@@ -0,0 +1,88 @@
+using System;
+using System.CodeDom;
+using System.Collections.Generic;
+using System.Data.SqlClient;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PoweredSoft.DynamicLinq.Fluent
+{
+    public abstract class QueryBuilderBase
+    {
+        public bool IsNullCheckingEnabled { get; protected set; } = false;
+
+        public List<QueryBuilderFilter> Filters { get; protected set; } = new List<QueryBuilderFilter>();
+
+        public List<QueryBuilderSort> Sorts { get; protected set; } = new List<QueryBuilderSort>();
+
+        public virtual QueryBuilderBase NullChecking(bool check = true)
+        {
+            IsNullCheckingEnabled = check;
+            return this;
+        }
+
+        public virtual QueryBuilderBase Compare(string path, ConditionOperators conditionOperators, object value,
+            QueryConvertStrategy convertStrategy = QueryConvertStrategy.ConvertConstantToComparedPropertyOrField,
+            bool and = true, QueryCollectionHandling collectionHandling = QueryCollectionHandling.Any)
+        {
+            Filters.Add(new QueryBuilderFilter
+            {
+                And = and,
+                ConditionOperator = conditionOperators,
+                Path = path,
+                Value = value,
+                ConvertStrategy = convertStrategy,
+                CollectionHandling = collectionHandling
+            });
+
+            return this;
+        }
+
+        public virtual QueryBuilderBase Sort(string path, SortOrder sortOrder, bool appendSort)
+        {
+            Sorts.Add(new QueryBuilderSort
+            {
+                Path = path,
+                SortOrder = sortOrder,
+                AppendSort = appendSort
+            });
+            return this;
+        }
+
+        protected abstract QueryBuilderBase GetSubQueryBuilder();
+
+        public virtual QueryBuilderBase SubQuery(Action<QueryBuilderBase> subQuery, bool and = true)
+        {
+            // create query builder for same type.
+            var qb = GetSubQueryBuilder();
+            qb.NullChecking(IsNullCheckingEnabled);
+
+            // callback.
+            subQuery(qb);
+
+            // create a query part.
+            var part = new QueryBuilderFilter();
+            part.And = and;
+            part.Filters = qb.Filters;
+            Filters.Add(part);
+
+            //return self.
+            return this;
+        }
+
+        public QueryBuilderBase And(string path, ConditionOperators conditionOperator, object value,
+            QueryConvertStrategy convertStrategy = QueryConvertStrategy.ConvertConstantToComparedPropertyOrField, QueryCollectionHandling collectionHandling = QueryCollectionHandling.Any)
+            => Compare(path, conditionOperator, value, convertStrategy: convertStrategy, collectionHandling: collectionHandling, and: true);
+
+        public QueryBuilderBase Or(string path, ConditionOperators conditionOperator, object value,
+            QueryConvertStrategy convertStrategy = QueryConvertStrategy.ConvertConstantToComparedPropertyOrField, QueryCollectionHandling collectionHandling = QueryCollectionHandling.Any)
+            => Compare(path, conditionOperator, value, convertStrategy: convertStrategy, collectionHandling: collectionHandling, and: false);
+
+        public QueryBuilderBase And(Action<QueryBuilderBase> subQuery)
+            => SubQuery(subQuery, true);
+
+        public QueryBuilderBase Or(Action<QueryBuilderBase> subQuery)
+            => SubQuery(subQuery, false);
+    }
+}

PoweredSoft.DynamicLinq/PoweredSoft.DynamicLinq.csproj

@@ -42,6 +42,7 @@
   <ItemGroup>
     <Compile Include="Constants.cs" />
     <Compile Include="Extensions\QueryableExtensions.cs" />
+    <Compile Include="Fluent\QueryBuilderBase.cs" />
     <Compile Include="Fluent\QueryBuilderSort.cs" />
     <Compile Include="Helpers\QueryableHelpers.cs" />
     <Compile Include="Helpers\TypeHelpers.cs" />