CSHARP-917: added support for linq queries through a dictionary.

Author: craiggwilson

src/MongoDB.Bson/Serialization/Serializers/DictionarySerializerBase.cs

@@ -24,7 +24,11 @@ namespace MongoDB.Bson.Serialization.Serializers
     /// Represents a serializer for dictionaries.
     /// </summary>
     /// <typeparam name="TDictionary">The type of the dictionary.</typeparam>
-    public abstract class DictionarySerializerBase<TDictionary> : ClassSerializerBase<TDictionary>, IBsonDictionarySerializer where TDictionary : class, IDictionary
+    public abstract class DictionarySerializerBase<TDictionary> :
+        ClassSerializerBase<TDictionary>,
+        IBsonDocumentSerializer,
+        IBsonDictionarySerializer
+        where TDictionary : class, IDictionary
     {
         // private constants
         private static class Flags
@@ -110,7 +114,24 @@ public IBsonSerializer ValueSerializer
             get { return _valueSerializer; }
         }
 
-        // public methods
+        // public methods        
+        /// <inheritdoc/>
+        public bool TryGetMemberSerializationInfo(string memberName, out BsonSerializationInfo serializationInfo)
+        {
+            if (_dictionaryRepresentation != DictionaryRepresentation.Document)
+            {
+                serializationInfo = null;
+                return false;
+            }
+
+            serializationInfo = new BsonSerializationInfo(
+                memberName,
+                _valueSerializer,
+                _valueSerializer.ValueType);
+            return true;
+        }
+
+        // protected methods
         /// <summary>
         /// Deserializes a value.
         /// </summary>
@@ -314,7 +335,11 @@ private string SerializeKeyString(object key)
     /// <typeparam name="TDictionary">The type of the dictionary.</typeparam>
     /// <typeparam name="TKey">The type of the keys.</typeparam>
     /// <typeparam name="TValue">The type of the values.</typeparam>
-    public abstract class DictionarySerializerBase<TDictionary, TKey, TValue> : ClassSerializerBase<TDictionary>, IBsonDictionarySerializer where TDictionary : class, IDictionary<TKey, TValue>
+    public abstract class DictionarySerializerBase<TDictionary, TKey, TValue> :
+        ClassSerializerBase<TDictionary>,
+        IBsonDocumentSerializer,
+        IBsonDictionarySerializer
+        where TDictionary : class, IDictionary<TKey, TValue>
     {
         // private constants
         private static class Flags
@@ -401,6 +426,23 @@ public IBsonSerializer<TValue> ValueSerializer
         }
 
         // public methods
+        /// <inheritdoc/>
+        public bool TryGetMemberSerializationInfo(string memberName, out BsonSerializationInfo serializationInfo)
+        {
+            if (_dictionaryRepresentation != DictionaryRepresentation.Document)
+            {
+                serializationInfo = null;
+                return false;
+            }
+
+            serializationInfo = new BsonSerializationInfo(
+                memberName,
+                _valueSerializer,
+                _valueSerializer.ValueType);
+            return true;
+        }
+
+        // protected methods
         /// <summary>
         /// Deserializes a value.
         /// </summary>

src/MongoDB.Driver.Tests/Linq/IntegrationTestBase.cs

@@ -81,6 +81,7 @@ private void InsertFirst()
                 O = new List<long> { 10, 20, 30 },
                 Q = Q.One,
                 R = new DateTime(2013, 1, 2, 3, 4, 5, 6, DateTimeKind.Utc),
+                T = new Dictionary<string, int> { { "one", 1 }, { "two", 2 } }
             };
             _collection.InsertOneAsync(root).GetAwaiter().GetResult();
         }
@@ -175,6 +176,8 @@ public class Root : IRoot
             public Q Q { get; set; }
 
             public DateTime? R { get; set; }
+
+            public Dictionary<string, int> T { get; set; }
         }
 
         public class RootDescended : Root

src/MongoDB.Driver.Tests/Linq/Translators/PredicateTranslatorTests.cs

@@ -336,6 +336,15 @@ public void CompareTo_not_equal()
                 "{'A': { $ne: 'Amazing' } }");
         }
 
+        [Test]
+        public void DictionaryIndexer()
+        {
+            Assert(
+                x => x.T["one"] == 1,
+                1,
+                "{'T.one': 1}");
+        }
+
         [Test]
         public void EnumerableCount()
         {