Added a LowerCaseElementNameConvention.

MongoDB.Bson/MongoDB.Bson.csproj

@@ -108,6 +108,7 @@
     <Compile Include="Serialization\Conventions\CamelCaseElementNameConvention.cs" />
     <Compile Include="Serialization\Conventions\HierarchicalDiscriminatorConvention.cs" />
     <Compile Include="Serialization\Conventions\LookupIdGeneratorConvention.cs" />
+    <Compile Include="Serialization\Conventions\LowerCaseElementNameConvention.cs" />
     <Compile Include="Serialization\Conventions\MemberNameElementNameConvention.cs" />
     <Compile Include="Serialization\Conventions\NamedExtraElementsMemberConvention.cs" />
     <Compile Include="Serialization\Conventions\NamedIdMemberConvention.cs" />

MongoDB.Bson/Serialization/Conventions/LowerCaseElementNameConvention.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Reflection;
+
+namespace MongoDB.Bson.Serialization.Conventions
+{
+    /// <summary>
+    /// Represents an element name convention where the element name is the member name being all lower cased.
+    /// </summary>
+    public class LowerCaseElementNameConvention : IElementNameConvention
+    {
+        /// <summary>
+        /// Gets the element name for a member.
+        /// </summary>
+        /// <param name="member">The member.</param>
+        /// <returns>The element name.</returns>
+        public string GetElementName(MemberInfo member)
+        {
+            return member.Name.ToLowerInvariant();
+        }
+    }
+}

MongoDB.BsonUnitTests/DefaultSerializer/Conventions/ElementNameConventionsTests.cs

@@ -54,5 +54,15 @@ public void TestCamelCaseElementNameConvention()
             Assert.AreEqual("_DumbName", convention.GetElementName(typeof(TestClass).GetProperty("_DumbName")));
             Assert.AreEqual("lowerCase", convention.GetElementName(typeof(TestClass).GetProperty("lowerCase")));
         }
+
+        [Test]
+        public void TestLowerCaseElementNameConvention()
+        {
+            var convention = new LowerCaseElementNameConvention();
+            Assert.AreEqual("firstname", convention.GetElementName(typeof(TestClass).GetProperty("FirstName")));
+            Assert.AreEqual("age", convention.GetElementName(typeof(TestClass).GetProperty("Age")));
+            Assert.AreEqual("_dumbname", convention.GetElementName(typeof(TestClass).GetProperty("_DumbName")));
+            Assert.AreEqual("lowercase", convention.GetElementName(typeof(TestClass).GetProperty("lowerCase")));
+        }
     }
 }