DataType. ToSerializableString uses aliases.

Author: mikasoukhov

Messages/DataType.cs

@@ -380,12 +380,27 @@ public override string ToString()
 	/// </summary>
 	public static ISet<DataType> CandleSources { get; } = new HashSet<DataType>([Ticks, Level1, MarketDepth, OrderLog]);
 
+	private static readonly PairSet<string, DataType> _aliasToType = new(StringComparer.InvariantCultureIgnoreCase)
+	{
+		{ "level1", Level1 },
+		{ "ticks", Ticks },
+		{ "marketdepth", MarketDepth },
+		{ "orderlog", OrderLog },
+		{ "transactions", Transactions },
+		{ "news", News },
+		{ "securities", Securities },
+		{ "positions", PositionChanges },
+	};
+
 	/// <summary>
 	/// Serialize <see cref="DataType"/> to <see cref="string"/>.
 	/// </summary>
 	/// <returns>The string representation of <see cref="DataType"/>.</returns>
 	public string ToSerializableString()
 	{
+		if (_aliasToType.TryGetKey(this, out var alias))
+			return alias;
+
 		var type = MessageType;
 		var arg = Arg;
 
@@ -402,6 +417,9 @@ public static DataType FromSerializableString(string value)
 		if (value.IsEmpty())
 			return null;
 
+		if (_aliasToType.TryGetValue(value, out var aliasDt))
+			return aliasDt;
+
 		var parts = value.SplitByColon(false);
 
 		var msgType = parts[0].To<Type>();

Tests/DataTypeTests.cs

@@ -168,4 +168,26 @@ public void Name_Does_Not_Affect_Equality_Or_Hash()
 		dt2.AreEqual(dt1);
 		dt2.GetHashCode().AreEqual(dt1.GetHashCode());
 	}
+
+	[TestMethod]
+	public void SerializableString_Aliases()
+	{
+		static void TestAlias(DataType dt, string expected)
+		{
+			var s = dt.ToSerializableString();
+			s.AssertEqual(expected);
+			var back = DataType.FromSerializableString(s);
+			back.AreEqual(dt);
+
+			// also check case-insensitive
+			var upper = expected.ToUpperInvariant();
+			var back2 = DataType.FromSerializableString(upper);
+			back2.AreEqual(dt);
+		}
+
+		TestAlias(DataType.Level1, "level1");
+		TestAlias(DataType.Ticks, "ticks");
+		TestAlias(DataType.MarketDepth, "marketdepth");
+		TestAlias(DataType.OrderLog, "orderlog");
+	}
 }