Use YamlAliasAttribute value when serializing.

YamlDotNet.RepresentationModel/Serialization/FullObjectGraphTraversalStrategy.cs

@@ -180,10 +180,11 @@ namespace YamlDotNet.RepresentationModel.Serialization
 			{
 				var propertyValue = property.GetValue(value, null);
 				var propertyType = property.PropertyType;
+				var propertyName = GetPropertyName(type, property);
 
-				if(visitor.EnterMapping(property.Name, typeof(string), propertyValue, propertyType))
+				if(visitor.EnterMapping(propertyName, typeof(string), propertyValue, propertyType))
 				{
-					Traverse(property.Name, typeof(string), visitor, currentDepth);
+					Traverse(propertyName, typeof(string), visitor, currentDepth);
 					Traverse(propertyValue, propertyType, visitor, currentDepth);
 				}
 			}
@@ -206,6 +207,12 @@ namespace YamlDotNet.RepresentationModel.Serialization
 				property.GetCustomAttributes(typeof(YamlIgnoreAttribute), true).Length == 0;
 		}
 
+		protected string GetPropertyName(Type type, PropertyInfo property)
+		{
+			var aliasProps = property.GetCustomAttributes(typeof(YamlAliasAttribute), true);
+			return aliasProps.Length == 0 ? property.Name : ((YamlAliasAttribute)aliasProps[0]).Alias;
+		}
+
 		private static Type GetObjectType(object value)
 		{
 			return value != null ? value.GetType() : typeof(object);

YamlDotNet.UnitTests/RepresentationModel/SerializationTests.cs

@@ -723,5 +723,24 @@ namespace YamlDotNet.UnitTests.RepresentationModel
 			Assert.Equal("Third", result.ThirdTest);
 			Assert.Equal("Fourth", result.AliasTest);
 		}
+
+		[Fact]
+		public void RoundtripAlias()
+		{
+			var input = new ConventionTest { AliasTest = "Fourth" };
+			var serializer = new Serializer();
+			var writer = new StringWriter();
+			serializer.Serialize(writer, input, input.GetType());
+			string serialized = writer.ToString();
+
+			// Ensure serialisation is correct
+			Assert.Equal("fourthTest: Fourth", serialized);
+
+			var deserializer = new YamlSerializer<ConventionTest>();
+			var output = deserializer.Deserialize(new StringReader(serialized));
+
+			// Ensure round-trip retains value
+			Assert.Equal(input.AliasTest, output.AliasTest);
+		}
 	}
 }